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Artigos de revistas sobre o tema "Schiff base ligands"

Autor: Grafiati

Publicado: 4 de junho de 2021

Última modificação: 9 de junho de 2025

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Biswas, Arpita. "A Brief Review on Homo-/Hetero-nuclear Co-ordination Compounds Derived from Some Single Compartmentl Acyclic Schiff Base Ligands having N-,O-Donor Centres." Oriental Journal Of Chemistry 38, no. 4 (August 31, 2022): 957–66. http://dx.doi.org/10.13005/ojc/380417.

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Tetradentate acyclic compartmental Schiff base ligand with N2O2 compartment afford suitable coordination environment for large variety of metal ions. This type of ligands can easily be synthesized by [2+1] condensation of a carbonyl compounds with a diamine. Several metal complexes have been reported from the single- and double-compartment acyclic Schiff base ligands which are the [2+1] condensation products of salicylaldehyde, 2-hydroxyacetophenone, 3-methoxysalicylaldehyde, 3-ethoxysalicylaldehyde and a diamine; The diamine counterpart in these ligands are ethylenediamine, 1,3-diaminopropane, 1,4-diaminobutane, 1-methylethylenediamine, 2,2-dimethyl,1,3-diaminopropane, o-phenylenediamine, trans-1,2-diaminocyclohexane, etc. Several review article has been published previously on compartmental Schiff base ligand compounds. This review article focused only the type and structures of Cu(II)/Ni(II)-second metal (s-, p-, d10-, 3d-,, 4f- block metal) homo-/hetero- nuclear coordination comppounds derived from single compartmentl salicyaldehyde-diamine and acetophenone-diamine ligand systems.

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Abbasova, G. G., A. A. Medjidov, R. H. Ismayilov, A. M. Pashajanov, and P. A. Fatullayeva. "Synthesis and characterization of rare earth metal complexes with novel Schiff base." Fine Chemical Technologies 20, no. 1 (March 5, 2025): 47–54. https://doi.org/10.32362/2410-6593-2025-20-1-47-54.

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Objectives. The work set out to synthesize Schiff base ligands containing a hydrazone moiety of (Z)-2-((E)-1-hydroxyethylidene)hydrazineylidene)-2-phenylacetic acid, as well as their praseodymium, samarium, europium, and gadolinium complexes, and to study their structure.Methods. The structure of ligands was identified by infrared (IR), ultraviolet (UV), and nuclear magnetic resonance (NMR) spectroscopy. The structure of the complexes was confirmed by elemental analysis, IR and UV spectroscopy, and thermogravimetric analysis.Results. The Schiff base ligands containing a hydrazone moiety of (Z)-2-((E)-1-hydroxyethylidene)hydrazineylidene)-2-phenylacetic acid, as well as their praseodymium, samarium, europium, and gadolinium complexes, were synthesized using the authors’ procedure.Conclusions. NMR and IR spectroscopic data confirm that the Schiff base ligand is in the keto form. There are three absorption bands in the wavelength range of 205–306 nm in the UV spectrum of the ligand. A bathochromic shift is observed in the spectrum of all complexes. The molar ratio of ligand and metal in the complexes was 3 : 1.

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Haruna, A., I. T. Sirajo, M. M. Rumah, and Y. Albashir. "Synthesis, Characterization, Biological Properties, ADMET and Drug-likeness Analysis of Mn (II) complexes with Schiff Bases Derived from Sulphathiazole and 4-diethylaminosalicyaldehyde/Salicyaldehyde." Journal for Research in Applied Sciences and Biotechnology 2, no. 6 (December 21, 2023): 58–68. http://dx.doi.org/10.55544/jrasb.2.6.10.

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Mn (II) complexes were synthesized with the Schiff base ligand obtained by the condensation of sulfathiazole with 4-diethylaminosalicyaldehyde/Salicyaldehyde. Their characterization was performed by elemental analysis, molar conductance, melting points, magnetic susceptibility, infrared, and UV–Vis spectral analysis. The results suggest that the Schiff bases and their complex are synthesized in excellent yield, molar conductance studies on the complexes indicated they were non-electrolytic. The IR data indicated that the Schiff base ligand is tridentate coordinated to the metallic ion with two N atoms from the azomethine group and thiazole ring and one O atom from the phenolic group. The electronic spectral study showed octahedral geometry for all the complexes which are further supported by magnetic moment values. The ligand and its complexes were screened against four bacterial and two fungal strains using the disk diffusion method. The antimicrobial evaluation results revealed that the metal (II) complexes exhibited higher antimicrobial activity than the free Schiff base ligand. The ADMET and drug-likeness studies of the synthesized ligands indicated that the Schiff base ligands fulfill Lipinski’s, Ghoose, Veber, Egan, and Mugge rules but the complexes showed some deviations. They also displayed low toxicity levels.

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Odularu, Ayodele Temidayo. "Manganese Schiff Base Complexes, Crystallographic Studies, Anticancer Activities, and Molecular Docking." Journal of Chemistry 2022 (August 24, 2022): 1–19. http://dx.doi.org/10.1155/2022/7062912.

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Choice of ligands is significant to successful synthesis of metal complexes (coordination compounds). This study reports the use of Schiff base as the right ligand to control the poor bioavailability and neurodegenerative toxicity challenges of manganese ion. In line with this study, document analysis was used as the methodological approach to evaluate the significance of Schiff base ligands in easing these manganese’s challenges and aligning the resultant coordination compounds (manganese Schiff base complexes) as therapeutic agents in anticancer studies. Report also involves crystallographic studies where single crystal X-ray crystallography was used as a chemical characterization technique. In addition, molecular docking studies, MOE2008, and AutoDock software were used to reveal the mode of interaction between the Schiff base and the manganese(II) and (III) ions, as well as scrutinizing the biological efficacy of the manganese(II) and manganese(III) Schiff bases coordination compounds as anticancer agents against some anticancer cell lines. Conclusion drawn was that manganese(II) and manganese(III) Schiff bases coordination compounds gave more active and potent activities than the corresponding Schiff bases. As a result, challenges of neurodegenerative toxicity and poor bioavailability of manganese ion were overcome, and the chelation therapy was fulfilled. Results from single crystal X-ray crystallography confirmed the successful synthesis of manganese(II) and manganese(III) Schiff bases coordination compounds and revealed the mechanism of reaction, while the molecular docking buttressed the biological activities of the Schiff base ligand and manganese Schiff base coordination compounds by portraying the structure activity relationship (SAR) between either Schiff base or the manganese Schiff base coordination compounds and the virtual cancer cell line (receptor protein), where hits were obtained for lead optimizations.

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El‐Boraey, Hanaa A., Randa M. Abdel‐Rahman, Ensaf M. Atia, and Ohyla A. EL‐Gammal. "Synthesis, spectral and thermal studies of new Schiff base copper(II) complexes with their biological effect on Entomopathogenic nematodes." Vietnam Journal of Chemistry 60, no. 2 (April 2022): 140–56. http://dx.doi.org/10.1002/vjch.202100080.

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AbstractNew Schiff base ligands; (Z)‐1,5‐diphenyl‐2‐((thiophen‐2‐ylmethylene)amino)‐1H‐pyrrole‐3‐carbonitrile (L1); or (Z)‐2‐((2,4‐dihydroxybenzylidene)amino)‐1,5‐diphenyl‐1H‐pyrrole‐3‐carbonitrile (H2L2) and their Cu(II) complexes have been isolated and characterized using elemental analysis, spectral (FT‐IR, 1H NMR, UV/vis, EPR), molar conductivity and magnetic moment measurements, in addition to thermal techniques. FT‐IR spectra established that the Schiff base L1 coordinates as neutral bidentate or tridentate ligand. While the Schiff base H2L2 ligates as neutral or monobasic bidentate ligand. The EPR spectra indicated covalent nature of complexes [CuL1(OH)]Cl.2H2O (1), [CuL1(OH)(H2O)2]NO3.2H2O (2), [Cu(H2L2)Cl(H2O)3]Cl.H2O (5) and [Cu(HL2)NO3(H2O)3].H2O (6). The biological effect of Cu(II) ions, current ligands and complexes (1, 5) on the mortality and rate of reproduction of Entomopathogenic nematodes (Heterorhabditis bacteriophora and Steinernema carpocapsae) was studied. The results showed that, the obtained Schiff base ligands and their Cu(II) complexes make detoxification of the lethal effect of Cu(II) ions on the beneficial Entomopathogenic nematodes and complex (1) scored the highest reproduction potential.

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Ayuba, Isiyaku, Tajo Siraj Ibrahim, Umar Maigari Aishatu, and Magaji Buhari. "Synthesis, characterization and anti-bacterial activity of Schiff Base and its mixed ligand complexes of Cr (II) and Co (II) containing vanillin and 2-aminophenol." Dutse Journal of Pure and Applied Sciences 7, no. 4a (February 2, 2022): 98–104. http://dx.doi.org/10.4314/dujopas.v7i4a.11.

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Schiff Base are organic ligand that contained azomethine linkage (-HC=N-) which shows biological importance. Schiff Base from vanillin and 2-aminophenol was synthesized in 1:1 mole ratio. The complexes of Cr (II) and Co (II) from Schiff Base in 1:2 mole ratio metal-ligand (M-L) and the mixed ligand complexes from Schiff Base and 2-aminophenol in 1:1:1 mole ratio ligand-metal-ligand(L-M-L) were synthesized and characterized based on solubility, melting point, conductivity, Fourier transform infrared spectroscopy (FTIR) and ultraviolet (UV). The solubility result shows that, dimethyl sulfoxide(DMSO) dissolved all the complexes. The results obtained from melting point, conductivity indicated purity and non-electrolytic of the complexes respectively. In metal complexes, the infrared data showed the ligands is coordinated to the metal ion through azomethine nitrogen, oxygen in methoxyl group and oxygen in phenolic group. In mixed ligand complexes, the infrared data revealed the ligands is coordinated to the metal ion through azomethine nitrogen, oxygen in methoxyl group, oxygen in phenolic group and nitrogen in amino group. The results showed a six coordinate octahedral geometry for these complexes. The ligands and the metal complexes were examined for their antibacterial activity using agar well diffusion method against Escherichia coli, Staphylococcus aureus, streptococcus pyrogens , Klebsiella pneumonia (gram - bacteria), and Bacillus sutilis, Staphylococcus aureus (gram + bacteria). In comparing the results, the complex of Co(HL1)2 has greater zone of inhibition against the tested organism than the free ligands as antibacterial agent.

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Osypiuk, Dariusz, Agata Bartyzel, and Beata Cristóvão. "Coordination Polymers of Vanadium and Selected Metal Ions with N,O-Donor Schiff Base Ligands—Synthesis, Crystal Structure, and Application." Molecules 30, no. 5 (February 27, 2025): 1104. https://doi.org/10.3390/molecules30051104.

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This review provides an overview of the synthesis, characterization and application of coordination polymers based on N,O-donor Schiff base ligands. The coordination polymers (CPs) represent a novel class of inorganic–organic hybrid materials with tunable compositions and fascinating structures. They are composed of metal ions and organic ligands. Therefore, the nature of the metal ion and type of organic ligand is the most significant factor in constructing targeted coordination polymers with the desired properties. Due to the versatile coordination modes, N,O-donor Schiff base ligands are also used to construct various CPs.

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Hari, S. Yadav, and L. Kumawat Gopal. "Synthesis, Spectroscopic, Biological, and Theoretical Evaluation of Novel Zirconium (IV) N, O Donor Amino Acid Schiff Base Complexes." Chemistry Research Journal 8, no. 1 (February 28, 2023): 12–22. https://doi.org/10.5281/zenodo.11296500.

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Abstract A series of novel dichlorozirconium (IV) Schiff bases complexes [ZrCl2 (L)2] (LH = N, O donor Schiff base derived by the condensation of 2-Acetyl-5-methylfuran & 2-acetyl-4-methyl thiophene with amino acids) were synthesized by the reaction of zirconium (IV) chloride and sodium salt of an N, O donor Schiff base ligand and characterized. The authenticity of all the synthesized ligands and their Zr (IV) complexes had been elucidated by microanalysis, various spectroscopic techniques like FT-IR, 1H NMR, 13C NMR spectroscopic techniques, electrical conductance measurements, and elemental analysis (CHN). The ligand acts as a bidentate in which the carboxylate oxygen and the azomethine nitrogen of the ligand are involved in coordination. Both the ligands and their corresponding metal complexes have been tested for their antibacterial and antifungal activity. The activities of the samples have shown significant and noticeable changes in complexation. Experimental studies propose that metal chelates are more potent than their parent ligands.

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Hsu, Chiao-Yin, Hsi-Ching Tseng, Jaya Kishore Vandavasi, Wei-Yi Lu, Li-Fang Wang, Michael Y. Chiang, Yi-Chun Lai, Hsing-Yin Chen та Hsuan-Ying Chen. "Investigation of the dinuclear effect of aluminum complexes in the ring-opening polymerization of ε-caprolactone". RSC Advances 7, № 31 (2017): 18851–60. http://dx.doi.org/10.1039/c7ra02136d.

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Al complexes bearing hydrazine-bridging Schiff base ligands showed the best catalytic activity, approximately 3- to 11-fold higher than that of dinuclear Al complexes bearing Salen ligands and mononuclear Al complexes bearing Schiff base ligands.

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D. T. Sakhare. "Synthesis, Spectroscopic Characterization, In-Vitro and Antimicrobial Activities of Some Metal (II) Complexes of 5-choloro-2-(((4,6-Dimethoxypyrimidin-2-yl) Imino) Methyl) Phenol." International Journal of Scientific Research in Chemistry 9, no. 6 (December 30, 2024): 01–09. https://doi.org/10.32628/ijsrch24961.

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The novel Schiff base ligand has been synthesized by the condensation of 5-chlorosalicylaldehyde and 2-amino-4,6-dimethoxypyrimidine. Metal complexes of the Schiff base were prepared by the reaction of the Schiff base and Iron nitrate in ethanol solution. The complexes isolated, washed and dried. The Schiff base is pale yellow, while Cu(II) and Mn(II) complexes is light yellow.The synthesized compounds have been characterized by FT-IR, 1H-NMR and UV-Vis techniques for the ligands and FT-IR, UV-Vis, all reactions monitored by TLC, molar conductivity and magnetic susceptibility measurements for the corresponding complexes.The complexe is paramagnetic. The results of the molar conductivity measurements indicated that all complexes are non-electrolytes in (DMSO). An octahedral geometry for all the complexes of. The ligands are bidentate, (L₁) through phenolic (OH) and azomethine nitrogen. The ligand and its complexes were screened for their antifungal and antibacterial activity against Aspergillus niger, Penicillium chrysogenum, Fusarium moneliforme, Aspergllus flavus and Escherichia coli, Salmonella typhi, Staphylococcus aureus, B. subtilis. The result indicated that the complexes exhibited good antifungal and antibacterial activities.

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Soroceanu, Alina, and Alexandra Bargan. "Advanced and Biomedical Applications of Schiff-Base Ligands and Their Metal Complexes: A Review." Crystals 12, no. 10 (October 12, 2022): 1436. http://dx.doi.org/10.3390/cryst12101436.

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Because of their importance in a variety of interdisciplinary study domains, Schiff-base ligands have performed a significant role in the evolution of contemporary coordination chemistry. This almost-comprehensive review covers all the aspects and properties of complexes, starting from the Schiff-base ligands. Our work is centered on the eloquent advances that have been developed since 2015, with special consideration to recent developments. Schiff-base ligands and their complexes are adaptable compounds obtained from the condensation of two compounds: a carbonyl with an amino. The correspondent metal complexes have been shown to have antifungal, antibacterial, antioxidant, antiproliferative, and antiviral properties. This review begins with a short introduction to Schiff-base ligands and their metal complexes. It stands out in the recent advancements in the Schiff-base coordination chemistry domain and its future prospects as a potential bioactive core. Additionally, the review contains knowledge about the antioxidant, redox, and catalytic activities of the Schiff-base complexes, with important future applications in the obtaining of new compounds and materials.

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Sharma, Bharat Prasad, Sarvesh Kumar Pandey, Bishnu Prasad Marasini, Sabita Shrestha, and Motee Lal Sharma. "Oxovanadium(IV) Complexes with Triazole Based Schiff Base Ligands: Synthesis, Characterization and Antibacterial Study." Journal of Nepal Chemical Society 42, no. 1 (March 1, 2021): 56–63. http://dx.doi.org/10.3126/jncs.v42i1.35332.

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Schiff bases have been synthesized by the reaction of triazole containing primary amine with aromatic carbonyl compounds. The Schiff bases prepared, act as ligand when these are made in contact with oxovanadium (VO2+) ion. Some new mononuclear oxovanadium(IV) complexes have been synthesized by the reaction of Schiff base ligands with vanadyl sulphate (VOSO4.xH2O) and the complexes are analyzed by different spectroscopic methods; [fourier-transform infrared (FTIR), ultraviolet-visible (UV-Vis.), electron paramagnetic resonance (EPR)], X-ray diffraction (XRD) analysis, elemental analysis, and conductivity measurement. The complexes have been well characterized based on analytical data. The electrolytic nature of the complexes was determined based on the molar conductance values. The powder XRD pattern has been used to determine crystal size and type. The synthesized Schiff base ligands and oxovanadium(IV) complexes were found to be stable in air and moisture at room temperature. On the basis of the physicochemical data, the tentative geometry of the complexes has been proposed. Antibacterial sensitivity of the ligand and its metal complexes have been assayed in vitro against bacterial pathogens viz. growth inhibitory activity of ligands and complexes against pathogens has also been determined.

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Jurowska, Anna, Janusz Szklarzewicz, Maciej Hodorowicz, Wiktoria Serafin, Ennio Zangrando, and Ghodrat Mahmoudi. "Ionic Dioxidovanadium(V) Complexes with Schiff-Base Ligands as Potential Insulin-Mimetic Agents—Substituent Effect on Structure and Stability." Molecules 27, no. 20 (October 16, 2022): 6942. http://dx.doi.org/10.3390/molecules27206942.

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Four dioxidovanadium(V) complexes with Schiff-base ligands based on 2-hydroxybenzhydrazide with four different substituted salicylaldehydes (5-chlorosalicylaldehyde, 3,5-dichlorosalicylaldehyde, 5-nitrosalicylaldehyde, 3-bromo-5-chlorosalicylaldehyde) were synthesized and described, by using V2O5 and triethylamine. The single crystal X-ray structure measurements as well as elemental analyses and IR spectra confirmed the formulas of the ionic complexes with a protonated triethylamine acting as counterion, HTEA[VO2(L)] (HL = Schiff-base ligand). The kinetic stability of the complexes at pH = 2 and 7 was discussed with respect to the neutral vanadium(V) complexes previously studied as potential insulin-mimetic agents. A correlation between the substituents in an aromatic ring of the Schiff-base ligands with crystal packing, and also with the stability of the compounds, was presented.

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Sharma, Deeksha, and Prof Arpan Bhardwaj. "A COMPARITIVE VIEW OVER THE SYNTHESIS OF SCHIFF BASE LIGANDS AND METAL COMPLEXES BY CONVENTIONAL AND SOLVENT FREE ROUTES." International Journal of Engineering Technologies and Management Research 4, no. 12 (April 24, 2020): 107–17. http://dx.doi.org/10.29121/ijetmr.v4.i12.2017.603.

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In the present paper, synthesis of Schiff base ligands and the metal complexes are studied and compared by conventional and solvent free route. The synthesis of Schiff base ligands of amino acids (Glycine, Phenylalanine and Tyrosine) with salicylaldehyde and their mixed ligand ternary Cu(II) complexes are discussed. Other ligands are used in co-ordinaion with the schiff base is 1,10- Phenanthroline/thiourea in equimolar ratio. The environmentally efficient and modern developed method for synthesis is the solid state synthesis of salicylidene amino acids through pestle mortar synthetic procedure. This method is compared with the conventional method that require refluxing the reactant mixture for hours in an organic solvent, here ethanol. The complexes are characterized by spectral techniques IR spectroscopy and UV spectroscopy. The investigations concluded that the pestle mortar assisted method is very rapid , simple and economic for the preparation of ligands and complexes as well. The Antimicrobial studies were also performed for the complexes. The spectral data for the ligands and complexes obtained from either method, conventional and solventless procedure are in good agreement with one another. The azomethine bonding(-CH=N-) between salicylaldehyde amino acids based Schiff bases is described by the IR spectral peak around 1600 cm-1.

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Deeksha, Sharma, and Arpan Bhardwaj Prof. "A COMPARITIVE VIEW OVER THE SYNTHESIS OF SCHIFF BASE LIGANDS AND METAL COMPLEXES BY CONVENTIONAL AND SOLVENT FREE ROUTES." International Journal of Engineering Technologies and Management Research 4, no. 12 : SE (December 31, 2017): 107–17. https://doi.org/10.5281/zenodo.1163783.

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In the present paper, synthesis of Schiff base ligands and the metal complexes are studied and compared by conventional and solvent free route. The synthesis of Schiff base ligands of amino acids (Glycine, Phenylalanine and Tyrosine) with salicylaldehyde and their mixed ligand ternary Cu(II) complexes are discussed. Other ligands are used in co-ordinaion with the schiff base is 1,10- Phenanthroline/thiourea  in equimolar ratio. The environmentally efficient and modern developed method for synthesis is the solid state synthesis of salicylidene amino acids through pestle mortar synthetic procedure. This method is compared with the conventional method that require refluxing the reactant mixture for hours in an organic solvent, here ethanol. The complexes are characterized by spectral techniques IR spectroscopy and UV spectroscopy. The investigations concluded that the pestle mortar assisted method is very rapid , simple and economic for the preparation of  ligands and complexes as well. The Antimicrobial studies were also performed for the complexes. The spectral data for the ligands and complexes obtained from either method, conventional and solventless procedure are in good agreement with one another. The azomethine bonding(-CH=N-) between salicylaldehyde amino acids based Schiff bases is described by the IR spectral peak around 1600 cm-1.

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Sobola, Abdullahi, Gareth Watkins, and Brecht van. "Synthesis, characterization and biological study of Cu(II) complexes of aminopyridine and (aminomethyl)pyridine Schiff bases." Journal of the Serbian Chemical Society 83, no. 7-8 (2018): 809–19. http://dx.doi.org/10.2298/jsc170913002s.

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The synthesis, characterization and antimicrobial activity determination of some aminopyridine- and (aminomethyl)pyridine?salicylaldimine copper(II) complexes were realized. The ligands, L1?L6, were prepared by condensing salicylaldehyde and o-vanillin with 2- and 3-amino- and (aminomethyl)pyridine, respectively. The complexes were characterized by micro-analytical, electronic, infrared and conductivity data. The structures of the Schiff base ligands were further confirmed from 1H- and 13C-NMR spectral data. This study established that salicylaldimine ligands could coordinate as neutral species via the imine-N and the undeprotonated phenolic-O. The complexes have the molecular formula: [CuLCl], [Cu(LH)2Cl2]?xH2O or [Cu(LH)Cl(H2O)]Cl. The X-ray crystal structure of [CuL6Cl] indicated a square planar geometry with the Schiff base ligand coordinated to the Cu(II) ion as a tridentate monobasic, N2O, ligand. The crystals crystallized in a monoclinic system with P21/c space group. All the ligands and their Cu(II) complexes were screened for their antimicrobial activity against Staphylococcus aureus subsp. aureus ATCC? 6538?*, Bacillus subtillis subsp. spizizenii ATCC? 6633?*, Escherichia coli ATCC? 8739?* and Candida albicans ATCC? 2091?* using agar diffusion and broth dilution techniques. The presence of the methoxyl group enhanced the antimicrobial activity of the salicylaldimine Schiff base ligands.

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Fuentealba, Mauricio, Deborah Gonzalez, and Vania Artigas. "Structural Characterization of Iron(iii) Dinuclear Complexes." Acta Crystallographica Section A Foundations and Advances 70, a1 (August 5, 2014): C1695. http://dx.doi.org/10.1107/s2053273314083041.

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Dinuclear complexes have been studied for different purposes: magnetic materials[1], Non-linear optics materials[2], molecular switches [3], mixed-valence systems, etc. With these antecedents in mind, we present in this work a new series of dinuclear Iron(III) complexes formed by different Schiff bases ligands. The reaction starting from the iron chloride salts with the 5-chloro or 5-bromo-salycilaldehyde and ethylendiamine yields two different kinds of dinuclear iron complexes in different reaction conditions. The first one (Fig N°1), are methoxo-bridged dinuclear iron(III) complexes in which each metal centre is coordinated with one mono-condensated Schiff base ligand, one 4-chloro or 4-bromo-2-(dimethoxymethyl)phenoxo ligand and two bridging methoxo ligands. The iron(III) centres are hexacoordinated (FeN2O4), the coordination sphere is formed by 2 nitrogen atoms of the ethylendiamine fragment, 2 oxygen atoms from the hydroxyl of the Schiff base and two O atoms from the methoxo ligands. Both iron(III) centres are related by a inversion centre. The second one (Fig N°2), the dinuclear complex is formed for the double condensation of ethylendiamine with 5-chloro or 5-bromo-salycilaldehyde and one oxygen from the dianionic ligand act as bridge with another unit. The iron (III) centres are also hexaccordinated (FeN2O3Cl) formed by 2 nitrogen atoms from ethylendiamine fragment and 3 oxygen atoms from hydroxyl from Schiff base ligands and one chloro ligand. Finally, the electronic and redox properties have been studied by UV-Visible and cyclic voltammetry. ACKNOWLEDGMENT FONDECYT N01130640, FONDEQUIP EQM120095 and Beca CONICYT folio 21130944

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Kothari, R. "Anti-cancer activity of novel Schiff base copper (II) complex: synthesis and characterization." Journal of Optoelectronic and Biomedical Materials 15, no. 4 (December 2023): 127–40. http://dx.doi.org/10.15251/jobm.2023.154.127.

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A novel thiosemicarbazone substituted schiff base ligand and its Cu(II) complex have been prepared and characterized. Schiff bases are considered as an important pro ligand in coordination chemistry because they easily form stable complexes with biologically active transition metal ions. Such as Cu 2+, Zn2+, Ni2+ etc. In this paper, novel Cu (II) complexes of thiosemicarbazone ligands were synthesised by refluxing thiosemicarbazone substituted pro ligands with copper salts in 1:1 molar ratio in absolute ethanol under thermal condition at 80o c for 5-6 hour. The resulting brown coloured copper complexes were filtered and recrystallized from petroleum ether. In this synthesis, we use absolute ethanol as a polar environment for the synthesis of copper complexes from schiff base ligands because the use of polar solvent medium in synthesis plays a very important role in reducing minimum possibilities of side reactions which hinders the proper conversion of ligands into copper complexes and also reducing the reaction time. All synthesized compounds were characterized through various spectroscopic and pharmacological techniques. FT-IR, UVVis, NMR, Mass, TGA-DTA, XRD spectra techniques were used to confirm the structures of copper complexes and ligands. All compounds are thermal stable up to 350o c. The good results of pharmacological activities of compounds like in-vitro anti -oxidant and anti - cancer activity against DPPH and cisplatin drug, explained the presence of biologically active functional groups are present in ligands as well as their copper complexes. Results found that the copper complexes were more active than the ligands. The synthesis of copper complexes from thiosemicarbazone schiff base ligands in proper stoichiometic ratio is an excellent method of preparing pharmacological active compounds which can be considered as good anti -cancer drug candidate for the treatment of cancer.

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Majeed, May S. "Synthesis and Characterization of New Polymeric-Schiff Bases and Their Complexes." BASRA JOURNAL OF SCIENCE 40, no. 3 (December 1, 2022): 649–65. http://dx.doi.org/10.29072/basjs.20220309.

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Complexations of three new polymeric Schiff base ligands to transition metals (Ni and Zn) were synthesized via the preparation of a Schiff base ligand on Styrene-allyl alcohol (SAA) and two types of polyvinyl alcohol (PVA). These polymers were a supporting agent for preparing Schiff base ligand on it, followed by complexation with transition metals. Modified SAA and PVA polymers with Ni (II) and Zn (II) have been synthesized in order to investigate some transition metal complexes roles in these polymer modifications. The prepared polymeric complexes were confirmed and characterized by FTIR spectroscopy and TGA instrument respectively. The transition metals (Ni and Zn) content was estimated using SEM-EDX analysis

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Bhowmik, K. R. Nath Bhowmik, R. N. Dutta Purkayastha, and S. Roy. "Synthesis, Structural Characterization, Reactivity and Bioactivity Studies of Some Binuclear Salen Type Schiff Base Complexes of Manganese(III)." Asian Journal of Chemistry 36, no. 3 (February 28, 2024): 690–96. http://dx.doi.org/10.14233/ajchem.2024.31074.

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Four new phenoxy bridged binuclear Salen type Schiff base complexes of manganese(III), [MnLX]2 with tetradentate Schiff base, H2L [H2L = N,N′-O-phenylene bis(salicylaldimine)] containing anionic co-ligands, X (X = benzoate, p-hydroxy benzoate, p-aminobenzoate, 3,5-dinitrobenzoate) have been synthesized from manganese(II) acetate, Schiff base (H2L) and the corresponding co-ligands in methanol medium. Schiff base ligand (H2L) was obtained in situ by condensation of salicylaldehyde and o-phenylenediamine in aqueous methanol. Elemental analyses, FT-IR, molar conductance, UV-visible spectroscopic studies and magnetic moment measurements at room temperature were used to characterize the binuclear Schiff base complexes. The IR spectra of [MnLX]2 (X = benzoate, p-hydroxy benzoate, p-aminobenzoate, 3,5-dinitrobenzoate) complexes showed the characteristic absorptions due to coordinated azomethine nitrogen and phenolic oxygen atoms of the Schiff base. In addition, IR spectra of the compounds also suggest coordination of the co-ligands namely benzoate, p-hydroxy benzoate, p-aminobenzoate, 3,5-dinitrobenzoate in the respective complexes. A consistent presence of a band at ca. 755 cm-1 in all the binuclear complexes arises due to (Mn-O-Mn) moiety originated from interactions of phenoxy oxygen and manganese atoms, resulted in dimeric structure of the compounds. The magnetic moment values ranging from 4.74-4.91 B.M. per manganese centre for the complexes suggest presence of Mn(III) ion in the complexes. The overall coordination geometry around the manganese centres is distorted octahedral. Redox behaviour of the synthesized complexes was ascertained from cyclic voltametric studies. The Schiff base complexes, [Mn(L)X]2 (X = p-aminobenzoate, 3,5-dinitrobenzoate) have demonstrated their catalytic potentials in oxidizing selective organic substrates namely cyclohexene and styrene by hydrogen peroxide as oxidant. The oxidized products were characterized as trans-cyclohexane 1,2-diol and styrene epoxide, respectively. Complex 4 demonstrated a considerable level of effectiveness against a wide variety of pathogenic microorganisms.

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Bakhtiari, Atefeh, and Javad Safaei-Ghomi. "Effects of Chiral Ligands on the Asymmetric Carbonyl-Ene Reaction." Synlett 30, no. 15 (July 23, 2019): 1738–64. http://dx.doi.org/10.1055/s-0037-1611875.

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The carbonyl-ene reaction is one of the most well-known reactions for C–C bond formation. Based on frontier molecular orbitals (FMO), carbonyl-ene reactions occur between the highest occupied molecular orbital (HOMO) of the ene compound bearing an active hydrogen atom at the allylic center and the lowest unoccupied molecular orbital (LUMO) of the electron-deficient enophile, which is a carbonyl compound. A high activation barrier enforces the concerted ene reaction rather than a Diels–Alder reaction at high temperature. Employing a catalytic system can eliminate defects in the ene reaction, and chiral catalysts promote the reaction under mild conditions to produce optically active compounds. In this account, we highlight investigations on the effects of various classes of chiral ligands on intermolecular and intramolecular carbonyl-ene reactions.1 Introduction2 Biaryl-Type Chiral Ligands3 C 1- and C 2-Symmetric Bis(oxazoline) Ligands4 Schiff Base Ligands5 N,N′-Dioxide Ligands6 Conclusions

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Divya, Kumble, Geetha M. Pinto, and Asha F. Pinto. "APPLICATION OF METAL COMPLEXES OF SCHIFF BASES AS AN ANTIMICROBIAL DRUG: A REVIEW OF RECENT WORKS." International Journal of Current Pharmaceutical Research 9, no. 3 (May 5, 2017): 27. http://dx.doi.org/10.22159/ijcpr.2017.v9i3.19966.

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Schiff bases are versatile ligands which are synthesized from the condensation of primary amines with carbonyl groups. Synthesis of Schiff base transition metal complexes by using Schiff base as ligands appears to be fascinating in view of the possibility of obtaining coordination compounds of unusual structure and stability. These transition metal complexes have received exceptional consideration because of their active part in metalloenzymes and as biomimetic model compounds due to their closeness to natural proteins and enzymes. These compounds are very important in pharmaceutical fields because of their wide spectrum of biological activities. Most of them show biological activities including antibacterial, antifungal, antidiabetic, antitumor, antiproliferative, anticancer, herbicidal, and anti-inflammatory activities. The biological activity of the transition metal complexes derived from the Schiff base ligands has been widely studied. This review summarizes the importance, Scope and antimicrobial activities of Schiff base metal complexes.

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Nguyen, Quang Trung, Phuong Nam Pham Thi, and Van Tuyen Nguyen. "Synthesis, Characterization, and In Vitro Cytotoxicity of Unsymmetrical Tetradentate Schiff Base Cu(II) and Fe(III) Complexes." Bioinorganic Chemistry and Applications 2021 (May 3, 2021): 1–10. http://dx.doi.org/10.1155/2021/6696344.

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Unsymmetrical tetradentate Schiff base Fe(III) and Cu(II) complexes were prepared by the coordination of some unsymmetrical tetradentate Schiff base ligands with CuCl2·2H2O or FeCl3·6H2O. The obtained complexes were characterized by ESI-MS, IR, and UV-Vis. The spectroscopic data with typical signals are in agreement with the suggested molecular formulae of the complexes. Their cyclic voltammetric studies in acetonitrile solutions showed that the Cu(II)/Cu(I) and Fe(III)/Fe(II) reduction processes are at (−)1.882–(−) 1.782 V and at (−) 1.317–(−) 1.164 V, respectively. The in vitro cytotoxicity of obtained complexes was screened for KB and Hep-G2 human cancer cell lines. The results showed that almost unsymmetrical tetradentate Schiff base complexes have good cytotoxicity. The synthetic complexes bearing the unsymmetrical tetradentate Schiff base ligands with different substituted groups in the salicyl ring indicate different cytotoxicity. The obtained Fe(III) complexes are more cytotoxic than Cu(II) complexes and relative unsymmetric Schiff base ligands.

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Kassim, Karimah, and Muhamad Azwan Hamali. "Green Synthesis and Antimicrobial Studies of Ni(II) and Zn(II) Dinuclear Schiff Base Complexes." International Journal of Engineering & Technology 7, no. 3.11 (July 21, 2018): 237. http://dx.doi.org/10.14419/ijet.v7i3.11.16016.

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A series of tetradentate Zn(II) and Ni(II) Schiff base complexes derived from N,N-Bis-(2-hydroxyl-5-methoxybenzaldehyde)-m-phenylenediamine was synthesized using microwave assisted synthesis approach for 5-15 minutes. The confirmation of the ligand as well the respective complexes has been elucidated through physiochemical and spectroscopy analyses. The studies show that two metal ions formed bridges connecting two Schiff base ligands. The nitrogen and oxygen atoms in each ligand served as coordination sites for the metal ions. The Schiff base ligand and complexes were screened for antimicrobial properties using Disc diffusion method against Escherichia coli, Bacillus subtilis, Enterobacter cloacae, and Klebsiella pneumoniae. The screening shows that both Zn(II) and Ni(II) complexes give signif-icant inhibition towards the bacteria tested.

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S. Sharma, S., J. V. Ramani, D. P. Dalwadi, J. J. Bhalodia, N. K. Patel, D. D. Patel, and R. K. Patel. "New Ternary Transition Metal Complexes of 2-{[(2-aminophenyl)imino] methyl}Phenol and Metformin: Synthesis, Characterization and Antimicrobial Activity." E-Journal of Chemistry 8, no. 1 (2011): 361–67. http://dx.doi.org/10.1155/2011/723491.

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Complexes of Co(II), Ni(II) and Cu(II) were synthesized from Schiff base 2-{[(2-aminophenyl)imino]methyl}phenol and metformin. The authenticity of the transition metal complexes were characterized by elemental analyses, conductance and magnetic susceptibility measurements, as well as spectroscopic (IR, electronic) and thermal studies. IR spectral studies revealed the existence of the ligands in the amine form in the solid state. The magnetic and electronic spectral studies suggest an octahedral geometry for all the complexes. The metformin acts as a bidentate ligand and Schiff base ofo-phynelendiamine and salicylaldehyde acts as a tridentate ligand. Antimicrobial screening of the Schiff base, metformin and transition metal complexes were determined against the bacteriaEscherichia coliandBacillus megaterium.

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Sundaramurthy, Santha Lakshmi, Geetha J., and Saranya J. "SYNTHESIS, SPECTROSCOPIC CHARACTERISATION AND IN VITRO BIOLOGICAL STUDIES OF SCHIFF BASE TRANSITION METAL (II) COMPLEXES." International Journal of Applied and Advanced Scientific Research 1, no. 2 (January 22, 2017): 30–37. https://doi.org/10.5281/zenodo.256297.

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Coordination chemistry is the one of the interesting branch in inorganic chemistry. The research in coordination chemistry plays very important role in many fields including medical, industrial, analytical and material science. Schiff base is one of the important ligands in the field of Coordination Chemistry research. Schiff base is a condensation product of primary amines with carbonyl compounds. Amino acids are biologically important organic compounds and are very essential for every metabolic process. The research area encircling the coordination compounds with azomethine ligands derived from amino acids as main characters is widely expansive especially due to their potential interest aroused in various interdisciplinary fields such as bioinorganic chemistry. In the present work, we report the synthesis and characterization of ternary Schiff base transition metal complexes with the general formula [ML1L2]ClO4 (where, M = Mn(II), Co(II), Ni(II), Cu(II) and Zn(II)] ; L1= Schiff base ligand derived from L-valine and vanillin; L2 = N,N,N’,N’-tetramethyl-1,3-diaminopropane). The synthesized metal complexes were characterized by physicochemical techniques, spectroscopic analyses such as UV-Visible, FTIR, EPR and mass spectra. To facilitate the biological activities of the Schiff base and the transition metal complexes in vitro antibacterial, antifungal, antioxidant and larvicidal studies were carried out. The molar conductivity values revealed 1:1 electrolytic nature of all the metal complexes. The FTIR spectra confirmed that the metal centre is coordinated to imine nitrogen, phenolic oxygen atom present in carboxylate group of Schiff base ligand. It also suggested the presence of uncoordinated perchlorate anion. In vitro biological studies revealed that the Schiff base transition metal complexes possess good biological activities.

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Jamil, Yasmin Mos'ad, Fathi Mohammed Al-Azab, and Nedhal Abdulmawla Al-Selwi. "Novel organophosphorus Schiff base ligands: Synthesis, characterization, ligational aspects, XRD and biological activity studies." Ecletica Quimica 48, no. 3 (July 1, 2023): 36–53. http://dx.doi.org/10.26850/1678-4618eqj.v48.3.2023.p36-53.

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Six complexes have been synthesized from Cu(II), Ni(II), and Co(II) with new bidentate N2 donor Schiff base ligand (2-methoxybenzalidene-1-phenylsemicarbazide L1) and tridentate N2O donor organophosphorus Schiff base ligand (2-methoxybenzalidenediphenylphosphate-1-phenylsemicarbazide L2). Both ligands were synthesized and characterized by metal analysis, infrared (IR), ultraviolet visible (UV-Vis), and nuclear magnetic resonance (NMR) spectral studies. The chemical structures of the synthesized complexes were characterized using their metal analysis, magnetic susceptibility, molar conductance, IR, and UV-Vis spectra. According to molar ratio studies, the complexes have the composition of ML2 for L1 and ML for L2. The X-ray diffraction (XRD) studies showed that the particle size of ligands and L1 complexes were in nano-range. The ligands and their metal complexes have been screened for their antioxidant, antibacterial and antifungal activity.

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Raptopoulou, Catherine P. "Chiral 4f and 3d-4f Complexes from Enantiopure Salen-Type Schiff Base Ligands." Crystals 14, no. 5 (May 18, 2024): 474. http://dx.doi.org/10.3390/cryst14050474.

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This review summarizes the structural characteristics and physicochemical properties of chiral 4f and 3d-4f complexes based on enantiopure salen-type Schiff base ligands. The chirality originates from the enantiopure diamines and is imparted to the Schiff base ligands and complexes and finally to the crystal structures. The reported enantiopure Schiff base ligands derive from the condensation of aromatic aldehydes, such as salicylaldehyde and its various derivatives, and the enantiopure diamines, (1R,2R) or (1S,2S)-1,2-diamino-cyclohexane, (1R,2R) or (1S,2S)-1,2-diamino-1,2-diphenylethane, (R) or (S)-2,2′-diamino-1,1′-binaphthalene, and 1,2-diaminopropane.

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Sakhare, D. T. "Synthesis, Characterization and Biological Activity of New Pyrimidine Schiff Base and Its Cu(II), Ni(II) Complexes." Asian Journal of Chemical Sciences 15, no. 1 (February 13, 2025): 138–47. https://doi.org/10.9734/ajocs/2025/v15i1355.

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The novel Schiff base ligand (E)-2-(((2-hydroxynaphthalen-1-yl)methylene)amino)-6-methylpyrimidin-4-ol has been attained through the condensation of 2-amino-4-hydroxy-6-methylpyrimidine and 2-hydroxy-1-naphthaldehyde. Metal complexes of the Schiff base were formed by the interaction of the Schiff base and metal nitrate in an ethanol solution. The complexes were isolated, cleaned, and dried. The Schiff base appears pale yellow, whereas the Cu(II) and Ni(II) complexes exhibit a light yellow color. The synthesized compounds have been characterized by FT-IR, 1H-NMR, and UV-Vis techniques for the ligands, while FT-IR, UV-Vis, along with all reactions monitored by TLC, molar conductivity, and magnetic susceptibility measurements were employed for the corresponding complexes. The complexes are paramagnetic. The results from the molar conductivity measurements indicated that all complexes are non-electrolytes in (DMSO). An octahedral geometry is anticipated for all the complexes. The ligands are bidentate (L) through phenolic (OH) and azomethine nitrogen. The ligand and its complexes were evaluated for their antifungal and antibacterial efficacy against Aspergillus niger, Penicillium chrysogenum, Fusarium moniliforme, Aspergillus flavus, Escherichia coli, Salmonella typhi, Staphylococcus aureus, and B. subtilis. The results demonstrated that the complexes exhibited significant antifungal and antibacterial activities.

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Pavlović, Gordana, Mihael Majer та Marina Cindrić. "A tetranuclear cubane-like nickel(II) complex with a tridentate salicylideneimine Schiff base ligand: tetrakis[μ3-4-methyl-N-(2-oxidophenyl)salicylideneiminato]tetrakis[methanolnickel(II)] methanol 0.8-solvate". Acta Crystallographica Section E Crystallographic Communications 72, № 12 (10 листопада 2016): 1776–79. http://dx.doi.org/10.1107/s2056989016017722.

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The tetranuclear title complex, [Ni4(C14H11NO2)4(CH3OH)4]·0.8CH3OH, has a distorted cubane topology shaped by four Schiff base ligands. The cubane [Ni4(μ3-O4)] core is formedviathe O atoms from the Schiff base ligands. The octahedrally coordinated NiIIions occupy alternating vertices of the cube. Each NiIIion is coordinated by oneO,N,O′-tridentate dianionic ligand, two O atoms of oxidophenyl groups from adjacent ligands and the O atom of a coordinating methanol molecule. The cubane core is stabilizedviaan intramolecular O—H...O hydrogen bond between the hydroxy group of the coordinating methanol molecules and the phenolate O atom of the aldehyde Schiff base fragment. Additional stabilization is obtainedviaintramolecular C—H...O hydrogen bonds involving aromatic C—H groups and the oxygen atoms of adjacent methanol molecules. In the crystal, complex molecules are linked into chains parallel to thecaxisviaweak C—H...O hydrogen bonds. The partial-occupancy disordered methanol solvent molecule has a site occupancy of 0.8 and is linked to the tetranuclear unitviaan intermolecular C—H...O hydrogen bond involving a phenolate O atom.

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M., T. H. TARAFDER, and C. PAL S. "Mixed Ligand Complexes of Chromium(III) containing some Bidentate Amines and Quadridentate Schiff Base Ligands." Journal of Indian Chemical Society Vol. 72, Sep 1995 (September 30, 1995): 581–84. https://doi.org/10.5281/zenodo.5909239.

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Department of Chemistry, University of Rajshahi, Rajshahi, Bangladesh Manuscript received 15 July 1993, revised 27 January 1994, accepted 9 February 1994 A number of new mixed ligand complexes of chromium(m) using two diamines and three Schiff bases have been synthesised, having the compositions : [CrL2X2]X.nH2O, [Cr(C20H24N4\(O_2^2-\))(NCS)2]NCS, [Cr(C17H16- N2\(O_2^2-\))(NCS)2]NCS, [Cr(C17H24N4S2)(NCS)2]NCS, where L = NHz(CH3)3NH2 or NH2(CH2)6NH2; X = Cl or NCS; n = 0 or 4. Molar conductance data reveal that dichlorc and thiocyanato complexes of the diamines, thiocyanato complexes of the salicylaldehyde Schiff base of triethylene tetramine and thiophene 2-aldehyde Schiff base of N,N-bisdiarninoethyl-1,3-propanediamine are 1 : 1 electrolytes in DMSO while thiocyanato complex with 1,6-diaminohexane is 1 : 1 electrolyte in nitromethane. But dichloro complex with 1,3-diarninopropane and thiocyanato complex of salicylaldehyde Schiff base of 1,3-diaminopropane are non-electrolytes. Magnetic and spectral data support octahedral stereochemistry for the complexes.

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Rashad, Alaa Adnan, Dina A. Najeeb, Shaymaa M. Mahmoud, Evon Akram, Khalid Zainulabdeen, Salam Dulaim, and Rahimi M. Yusop. "Optical and surface properties of Schiff base ligands and Cu(II) and Co(II) complexes." Fine Chemical Technologies 19, no. 5 (November 4, 2024): 452–61. http://dx.doi.org/10.32362/2410-6593-2024-19-5-452-461.

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Objectives. To study the transition of electrons in 1,2-phenyl(4’-carboxy)benzylidene Schiff base ligand and transition metal ions, optical properties, as well as the surface chemistry of supported transition metals using diffuse reflectance spectroscopy (DRS); to study the roughness and morphology of the Schiff base ligand and its complexes using atomic force microscopy (AFM).Methods. DRS, AFM, and Fourier-transform infrared spectroscopy instruments were used to identify electron transitions, optical properties, and surface morphology in Schiff base ligands and their complexes.Results. The DRS revealed the d–d transitions and charge transfer shifts of all compounds, and helped identify the structure of the ligand. One of the optical properties studied was the energy gap calculation of the ligand and its complexes. The copper complex exhibited more semiconducting behavior with surface morphology properties such as surface roughness parameters lower than those of the ligand and the cobalt complex. This can be attributed to the smaller size of the copper atom, as well as lower electron transitions compared to the cobalt complex and the square planar bonding shape.Conclusions. In Schiff base ligands, the reflectance spectrum bands reveal three electron transitions: n→π*, π→π*, and σ→σ* transitions. In cobalt complexes, four transitions are indicated: 4A2(F)→4T1(F), 4A2(F)→4T1(P), charge transfer bands, and tetrahedral geometry. Copper complexes exhibit three transitions: 2B1g→2A1g, 2B1g→2Eg, and charge transfer bands, with a square planar geometry for their structure. The energy gap calculations were 2.42, 2.29, and 2.30 eV, respectively. In the case of the SH ligands, copper complexes, and cobalt complexes, all compounds exhibited semiconductor properties. However, the complexes displayed increased conductivity due to the influence of the metal and coordination structure.

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Ghosh, Subrata, Sukanya Bagchi, Sujit Kamilya, and Abhishake Mondal. "Effect of ligand substituents and tuning the spin-state switching in manganese(iii) complexes." Dalton Transactions 50, no. 13 (2021): 4634–42. http://dx.doi.org/10.1039/d1dt00284h.

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This work unravels the magneto-structural behavior of mononuclear manganese(iii) complexes with judiciously chosen substituted Schiff-base ligands, showcasing the role of ligand substitutions in spin-state switching.

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Lian, Wen-Jing, Xin-Tian Wang, Cheng-Zhi Xie, He Tian, Xue-Qing Song, He-Ting Pan, Xin Qiao, and Jing-Yuan Xu. "Mixed-ligand copper(ii) Schiff base complexes: the role of the co-ligand in DNA binding, DNA cleavage, protein binding and cytotoxicity." Dalton Transactions 45, no. 22 (2016): 9073–87. http://dx.doi.org/10.1039/c6dt00461j.

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Four novel mixed-ligand copper(ii) Schiff base complexes were synthesized and characterized. The biological features of the complexes and how acetic auxiliary ligands manipulate these features were investigated.

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Al-Mosawy, Manar. "Review of the biological effects of Schiff bases and their derivatives, including their synthesis." Medical Science Journal for Advance Research 4, no. 2 (July 31, 2023): 67–85. http://dx.doi.org/10.46966/msjar.v4i2.117.

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Aldehyde and amine buildup can shape Schiff's base complex of metal. Amino and carbonyl mixtures address a sizable group of ligands used to make Schiff bases that can facilitate with metal particles by the nitrogen iota of an azomethine particle. There has been much interest in these ligands. The C=N connect, in which different azomethines have been researched and professed to overwhelm massive organic activity, like impacts against microorganisms, growths, and infections, as well as against jungle fever and disease, might be the reason for the significance of azomethine replacements. Schiff base metal complexes have recently proven valuable compounds in various fields, including industry and medicine. Schiff's bases are the ideal substance with unmatched organic and inorganic chemistry service. because of the extensive range of biological movements that Schiff base ligand display and their complexes collection, use in clinical applications is observed to have affected the chemistry of Schiff bases, their derivatives, synthesis methods, and the specific biological applications for these compounds, along with the ones for antibacterial, antifungal, anticancer, and antiviral objectives, are defined on this overview. The manufacture, characterization, and biological results of Schiff bases and their derivatives can be discussed in this assessment.

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Joshi, K. R., A. J. Rojivadiya, and J. H. Pandya. "Synthesis and Spectroscopic and Antimicrobial Studies of Schiff Base Metal Complexes Derived from 2-Hydroxy-3-methoxy-5-nitrobenzaldehyde." International Journal of Inorganic Chemistry 2014 (November 17, 2014): 1–8. http://dx.doi.org/10.1155/2014/817412.

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Two new series of copper(II) and nickel(II) complexes with two new Schiff base ligands 2-((2,4-dimethylphenylimino)methyl)-6-methoxy-4-nitrophenol and 2-((3,4-difluorophenylimino)methyl)-6-methoxy-4-nitrophenol have been prepared. The Schiff base ligands were synthesized by the condensation of 2-hydroxy-3-methoxy-5-nitrobenzaldehyde with 2,4-dimethylaniline or 3,4-difluoroaniline. The ligands and their metal complexes have been characterized by IR, 1H NMR, mass and electronic spectra and TG analysis. The Schiff base ligands and their metal complexes were tested for antimicrobial activity against Gram positive bacteria Staphylococcus aureus, and Streptococcus pyogenes and Gram negative bacteria Escherichia coli, and Pseudomonas aeruginosa and fungus Candida albicans, Aspergillus niger, and Aspergillus clavatus using Broth Dilution Method.

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S P, Sridevi, Girija C R, and C. D. Satish. "Synthesis, Structure and Reactivity of Schiff Base Transition Metal Mixed Ligand Complexes Derived from Isatin and Salal." Oriental Journal Of Chemistry 37, no. 1 (February 28, 2021): 169–76. http://dx.doi.org/10.13005/ojc/370123.

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A series of Isatin derivative Schiff Base ligands have been prepared by the nucleophilic addition of 5-Bromo Isatin with various amine derivatives and characterized by CHNS analysis and spectral data. Similarly, two of Salicylaldehyde ligand have been prepared by the nucleophilic addition of Salal with amine derivatives. In order to investigate the coordination behavior of these ligands and their metal complexes of the type M(acac)x, L [M = Cu(II), Ni(II); L = Schiff base ligands; x = 0 or 2] mixed ligand (chelate) have been prepared from the reaction of these ligands with their corresponding metal (Ni, Cu) acetylacetonates. The present paper was an approach to understand the chelating mixed ligand formation in complexes. All the isolated Shiff base ligands and mixed acac metal complexes were characterized by using IR, 1H NMR, UV-VIS, molar conductance and TGA/DTA analysis. The biological activities of all the isolated ligands and their corresponding mixed acac metal complexes have been used to screening against the microorganisms both gram positive and gram negative bacteria such as E.coli and S.sureus respectively, fungi A.niger and C.albicans and the results have been compared with standard and control. The main idea of these types of biological screening is to understand the role of these isolated compounds in pharmaceutical industries for drug development.

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Wagh, Shaila, and B. R. Patil. "SYNTHESIS, SPECTRAL, THERMAL AND ANTIMICROBIAL STUDIES OF NEW METAL COMPLEXES OF SUBSTITUTED HYDROXY PROPIOPHENONE." RASAYAN Journal of Chemistry 15, no. 03 (2022): 1718–27. http://dx.doi.org/10.31788/rjc.2022.1536355.

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A new series of metal complexes of innovative bisketimines (L1 - L5) have been synthesized. Schiff base ligands were synthesized by condensing substituted 2’- hydroxy propiophenone and ethylene diamine. The synthesized Schiff bases act as tetradentate ligands with two nitrogen and two phenolic oxygen groups and co-ordinates with Co (II), Ni (II), Cu (II) and Zn (II) salts. Ligands and their metal complexes have been studied using 1H NMR, IR, UV-Vis and thermogravimetric techniques. The complexes were crystalline, according to the XRD pattern. The thermogravimetric data revealed the thermal stability of the complexes. The study of antibacterial and antifungal activities of the ligands and their metal complexes showed more effectiveness of metal complexes than Schiff base ligands.

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Hall, C. Dennis, Niki Sachsinger, Stanley C. Nyburg, and Jonathan W. Steed. "Redox-active Schiff base ligands." Journal of Organometallic Chemistry 561, no. 1-2 (June 1998): 209–19. http://dx.doi.org/10.1016/s0022-328x(98)00530-0.

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Sharma, Shobhana, Poonam Yadav, Seema, Suman Kumari, and Mamta Ranka. "MICROWAVE-ASSISTED SYNTHESIS OF SCHIFF BASE AND MIXED LIGAND COMPLEXES OF Cr(III): COMPARISON WITH CONVENTIONAL METHOD AND ANTIMICROBIAL STUDIES." RASAYAN Journal of Chemistry 16, no. 02 (2023): 884–91. http://dx.doi.org/10.31788/rjc.2023.1628228.

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The Sustainable/Greener approach is prioritized over the conventional approach because of its environment-friendly, less time-consuming, less energy-consuming, less hazardous compounds synthesis, and low expenditure. Using a greener approach involving the use of microwave, Cr complexes were synthesized from Schiff base and various bidentate ligands and compared with conventional methods. Condensing 2-amino pyridine and isatin produced Schiff base. Complexes of Cr(III) were synthesized by using some bio-potent secondary ligands with Schiff base. Both Schiff base and complexes were characterized by FTIR spectroscopy, 1H NMR spectroscopy, magnetic moment analysis, elemental investigation, etc. The synthesized compounds will be further used for biological evaluation that can be further used in drugs and agrochemical design.

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Yamgar, Ramesh S., Y. Nivid, Satish Nalawade, Mustapha Mandewale, R. G. Atram, and Sudhir S. Sawant. "Novel Zinc(II) Complexes of Heterocyclic Ligands as Antimicrobial Agents: Synthesis, Characterisation, and Antimicrobial Studies." Bioinorganic Chemistry and Applications 2014 (2014): 1–10. http://dx.doi.org/10.1155/2014/276598.

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The synthesis and antimicrobial activity of novel Zn(II) metal complexes derived from three novel heterocyclic Schiff base ligands 8-[(Z)-{[3-(N-methylamino)propyl]imino}methyl]-7-hydroxy-4-methyl-2H-chromen-2-one, 2-[(E)-{[4-(1H-1,2,4-triazol-1-ylmethyl)phenyl]imino}methyl]phenol, and (4S)-4-{4-[(E)-(2-hydroxybenzylidene)amino]benzyl}-1,3-oxazolidin-2-one have been described. These Schiff base ligands and metal complexes are characterised by spectroscopic techniques. According to these data, we propose an octahedral geometry to all the metal complexes. Antimicrobial activity of the Schiff base ligand and its metal complexes was studied against Gram negative bacteria:E. coliandPseudomonas fluorescens, Gram positive bacteria:Staphylococcus aureus,and also against fungi, that is,C. albicansandA. niger. Some of the metal complexes show significant antifungal activity (MIC < 0.2 μg/mL). The “in vitro” data has identified [Zn(NMAPIMHMC)2]·2H2O, [Zn(TMPIMP)2]·2H2O, and [Zn(HBABO)2]·2H2O as potential therapeutic antifungal agents againstC. albicansandA. niger.

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ALI, Safaa Hussein, Hassan Mwazi ABD ALREDHA, and Haider Sabah ABDULHUSSEIN. "ANTIBIOTIC ACTIVITY OF NEW SPECIES OF SCHIFF BASE METAL COMPLEXES." Periódico Tchê Química 17, no. 35 (July 20, 2020): 837–59. http://dx.doi.org/10.52571/ptq.v17.n35.2020.71_ali_pgs_837_859.pdf.

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Bacterial resistance is a growing challenge facing drug design scientists to find new medications or update commonly used antibiotics. The objective of this study was to synthesize, structure and highlight biological features of new species of metal-organic complexes [(MCl2))2)L1)] {M = Ni, Cu, L1) = N,N’-1,4- Phenylenebis(methanylylidene)bis(ethane-1,2-diamine)} and [(NiCl2))2)L2)]. The Schiff base ligands were prepared in an excellent yeilds by adding terephthalaldehyde to 1,2-ethane-diamine or 1,4-butane-diamine. Three binuclear Schiff base metal complexes were synthesized in a simple one-pot reaction by reacting the corresponding metal chloride (NiCl2) and CuCl2)) salts with the Schiff base ligands {L1) = N,N’-(1,4- phenylenebis(methanylylidene)bis(1,2-diethylamine)) and L2) = N,N’-(1,4- phenylenebis(methanylylidene)bis(butane-1,4-diamine))}. The obtained Schiff base metal complexes were analytically, characterized by a set of spectroscopic techniques such as FT-IR spectroscopy, 1H NMR spectra, and mass spectra. The structures characterization studies suggest that Schiff base ligands behave as N bidentate ligands for nickel and copper metal centers, which are known to act as Lewis acids. The biological activity of the Schiff base of nickel(II) and copper(II) complexes was tested by using the broth dilution method. The complexes showed antibacterial activity against all gram-negative and gram-positive bacteria (Enterobacter cloacae G-, Citrobacter G-, Pseudomonas G-, Klebsiella G-, Staphylococcus G+, and Streptococcus G+) that used in the trials. It is concluded that Schiff base metal complexes are a good candidate for the antibacterial drug because of its good activity against gram-negative and gram-positive strains demonstrated in the present study, as well as in other studies in the literature.

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Yeole, Sanjay, Vaibhava Sachin More, S. Lokhande R., Suhas Janwadkar, and Dilip Yadav. "Synthesis, Spectral, and Antimicrobial Activity of Some Mixed Ligand Co (II) Complexes of Schiff Base 2-[(3-Hydroxy Phenylimino) Methyl]-4-Nitrophenol with Some Amino Acids." International Journal of Advance and Applied Research 6, no. 25 (March 20, 2025): 150–55. https://doi.org/10.5281/zenodo.15294469.

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Abstract: The mixed ligand complexes of Co (II) with 2-[(3-hydroxy phenylimino)methyl]-4-nitrophenol (HPIMNP) as the primary ligand and amino acids (valine, alanine, or glutamine) as secondary ligands have been synthesised and characterised. The complexes were characterised by elemental analysis, conductivity measurement, 1H NMR, IR, and ultraviolet-visible spectral studies. Schiff base acts as a bidentate ligand, coordinating through deprotonated phenolic oxygen and azomethine N-atom. The conductivity studies of the complexes in DMSO at 10⁻³ M concentration indicate their non-electrolyte nature. Analytical and spectral data reveal that these complexes have a stoichiometry of 1:1:1 and display a distorted octahedral geometry. The tube dilution method has been used to study the antimicrobial activity of Schiff base and its mixed ligand complexes. It was found that the mixed ligand complexes have more potent antimicrobial activity than the Schiff base.

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Lumsden, Simone E. A., Gummadi Durgaprasad, Keren A. Thomas Muthiah, and Michael J. Rose. "Tuning coordination modes of pyridine/thioether Schiff base (NNS) ligands to mononuclear manganese carbonyls." Dalton Trans. 43, no. 28 (2014): 10725–38. http://dx.doi.org/10.1039/c4dt00600c.

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Manganese carbonyls are ligated by pyridine/thioether Schiff base (NNS) ligands. Coordination of the thioether-S donor to the Mn(i) center is determined by subtle steric changes at the ligand periphery.

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Sreenivas, V., G. Srikanth, Ch Vinutha, M. Shailaja, P. Muralidhar Reddy, and Ravinder Vadde. "Synthesis, Spectral Characterization and Antimicrobial Studies of Co(II) Complexes with Tetradentate Schiff bases Derived from Ortho-Phthalaldehyde." JOURNAL OF ADVANCES IN CHEMISTRY 9, no. 1 (May 1, 2016): 1873–82. http://dx.doi.org/10.24297/jac.v9i1.2852.

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A series of cobalt (II) complexes have been synthesized with Schiff bases derived from ortho-phthalaldehyde and various amines in aqueous methanol solution. The newly synthesized Schiff bases and their Co (II) complexes have been characterized by elemental analysis, magnetic susceptibility, thermal, conductance measurements, mass, IR, electronic, 1H,13C-NMR spectral techniques. These ligands act as tetradentate species and coordinate to the metal center through the different potential donor atoms such as N, O and S. The probable octahedral structures have been assigned to these complexes. All the synthesized Schiff base ligands and Co(II) metal complexes have also been screened for their antimicrobial activities and metal complexes found to be more active than respective Schiff-base ligands.

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Yadav, Jyoti, and Jai Devi. "Antimicrobial and Antioxidant Activities of Diorganotin(IV) Complexes Synthesized from 1,2,4-Triazole Derivatives." Asian Journal of Chemistry 32, no. 10 (2020): 2553–58. http://dx.doi.org/10.14233/ajchem.2020.22819.

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Novel diorganotin(IV) complexes were synthesized from 1,2,4-triazole Schiff base ligands which were synthesized by reaction between the 4-amino-5-phenyl-1,2,4-triazole-3-thiol and salicyaldehyde derivatives. The bonding and geometry of the diorganotin(IV) complexes were evaluated by using different spectroscopic techniques such as FT-IR, mass, 1H, 13C & 119Sn NMR. The different spectroscopic techniques revealed the tridentate (ONS) mode of chelation of Schiff base ligands and pentacoordinated environment around the central tin metal which was satisfied with azomethine nitrogen, phenolic oxygen, thiolic sulfur and metal-carbon bond of alkyl/aryl group. The Schiff base ligands and their organotin(IV) complexes were tested for their in vitro antimicrobial and antioxidant activities to examine the biological outline of complexes in comparison to standard drugs. The results of activities data revealed that diorganotin(IV) complexes are more active than Schiff base ligands and some diorganotin(IV) complexes are even more active than the standard drugs. In all the synthesized complexes, compound 9 (Bu2SnL2) and 10 (Ph2SnL2) were most potent and can be used in future clinical trials.

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Varshney, Anshita, and A. P. Mishra. "Novel Ni(II) and Zn(II) Schiff base metal chelates as promising DNA binder, Antioxidant and Antifungal agents." Mediterranean Journal of Chemistry 14, no. 2 (May 21, 2024): 94. http://dx.doi.org/10.13171/mjc02405211777varshney.

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Schiff base ligands and their 3d-metal chelates have gained significant attention due to various applications in various scientific platforms. Due to their chelating propensity, they possess a wide range of biological, biochemical, catalytic, clinical, dying, and pharmacological properties. Here, in present studies, two novel Ni(II) and Zn(II) transition metal chelates have been synthesized by condensing their metal salts with Schiff base ligand 4-chloro-2-(2,5-dimethoxybenzylideneamino)-5-nitrophenol originated from 2,5-dimethoxybenzaldehyde and 2-amino-4-chloro-5-nitrophenol. The synthesized Schiff base ligand and its metal chelates have been Spectro-chemically examined by FT-IR, UV-Vis absorption spectroscopy, Mass Spectrometry, 1HNMR, Thermogravimetric analysis (TGA) and Powdered-XRD. These compounds are biologically reactive and exhibit antifungal, antioxidant, and DNA-binding activity. The Ni(II) metal chelate gives better biological activity than the Zn(II) metal chelate and parent Schiff base ligand.

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Ejidike, Ikechukwu P., and Peter A. Ajibade. "Transition metal complexes of symmetrical and asymmetrical Schiff bases as antibacterial, antifungal, antioxidant, and anticancer agents: progress and prospects." Reviews in Inorganic Chemistry 35, no. 4 (December 1, 2015): 191–224. http://dx.doi.org/10.1515/revic-2015-0007.

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AbstractThe huge research on Schiff base coordination complexes in the past few decades has given rise to several new molecules that have been of biological importance. The ease with which the Schiff base ligands are designed and prepared and their pattern is elucidated have made them to be referred to as “fortunate ligands” possessing azomethine derivatives, the C=N linkage that is essential for biological activity, including antibacterial, antifungal, antioxidant, anticancer, and diuretic activities. A variety of Schiff base and its complexes have been studied as model molecules for biological oxygen carrier systems. The uses of Schiff bases as DNA-cleaving agents and its mode of interaction and free-radical scavenging properties are described. The review encapsulates the applications of Schiff bases and their complexes.

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Halevas, Eleftherios, Antonios Hatzidimitriou, Barbara Mavroidi, Marina Sagnou, Maria Pelecanou, and Dimitris Matiadis. "Synthesis and Structural Characterization of (E)-4-[(2-Hydroxy-3-methoxybenzylidene)amino]butanoic Acid and Its Novel Cu(II) Complex." Molbank 2021, no. 1 (January 6, 2021): M1179. http://dx.doi.org/10.3390/m1179.

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A novel Cu(II) complex based on the Schiff base obtained by the condensation of ortho-vanillin with gamma-aminobutyric acid was synthesized. The compounds are physico-chemically characterized by elemental analysis, HR-ESI-MS, FT-IR, and UV-Vis. The complex and the Schiff base ligand are further structurally identified by single crystal X-ray diffraction and 1H and 13C-NMR, respectively. The results suggest that the Schiff base are synthesized in excellent yield under mild reaction conditions in the presence of glacial acetic acid and the crystal structure of its Cu(II) complex reflects an one-dimensional polymeric compound. The molecular structure of the complex consists of a Cu(II) ion bound to two singly deprotonated Schiff base bridging ligands that form a CuN2O4 chelation environment, and a coordination sphere with a disordered octahedral geometry.

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Deng, Ji-Hua, Gui-Quan Guo та Di-Chang Zhong. "Bis[N-aminocarbonyl-N′-(3-pyridylmethylene-κN)hydrazine]diaquabis(thiocyanato-κN)zinc(II)". Acta Crystallographica Section E Structure Reports Online 63, № 11 (10 жовтня 2007): m2696—m2697. http://dx.doi.org/10.1107/s1600536807048908.

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The Zn atom of the title complex, [Zn(NCS)2(C7H8N4O)2(H2O)2] or [Zn(SCN)2(H-Pysc)2(H2O)2] [H-Pysc = N-aminocarbonyl-N′-(3-pyridylmethylene)hydrazine], derived from the condensation of pyridine-3-carbaldehyde and semicarbazone, is located at a crystallographic centre of inversion and is octahedrally coordinated by two thiocyanate anions, two aqua molecules and two molecules of the neutral Schiff base ligand H-Pysc. The Schiff base molecules act as monodentate ligands coordinating the metal through the pyridyl N atom, whereas the amide O and imine N atoms remain uncoordinated. The crystal packing is stabilized by intermolecular hydrogen bonds involving H-Pysc ligands, thiocyanate anions and water molecules.

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