Articles de revues : « Ligand imine »

1

Hou, Lulu, Hongyu Ren et Baoli Guo. « Research progress of pre-transition metal olefin polymerization catalyst for salicylaldehyde imine ». Journal of Polymer Science and Engineering 5, n^o 1 (8 août 2018) : 281. http://dx.doi.org/10.24294/jpse.v5i1.281.

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Salicylaldehyde imine transition metal catalyst is a kind of olefin polymerization catalyst that is widely used in the coordination of salicylaldehyde imine ligand and pre-transition metal. Salicylaldehyde imine ligands have the characteristic of easily inserting diﬀerent substituents via organic synthesis. Therefore, the regulation of the polymerization activity, polymerization product, and product distribution can be achieved by changing the steric hindrance eﬀect, the electronic eﬀect, and the number of metal active sites near the catalytic active center. The development status of the transition metal catalyst of salicylaldehyde imide was summarized in this paper. The influence of the ligand structure of the salicylaldehyde imide transition metal catalyst on the catalytic performance, which involved the high selectivity of ethylene trimerization, ethylene/α-olefin, polar monomer copolymerization, ethylene polymerization production, ultra-high molecular weight polyethylene, and many other areas of olefin polymerization, was elaborated, providing references for further study and industrial applications of this catalyst.

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Khatua, Manas, Bappaditya Goswami et Subhas Samanta. « Dehydrogenation of amines in aryl-amine functionalized pincer-like nitrogen-donor redox non-innocent ligands via ligand reduction on a Ni(ii) template ». Dalton Transactions 49, n^o 20 (2020) : 6816–31. http://dx.doi.org/10.1039/d0dt00466a.

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Ferraz de Paiva, Raphael Enoque, Douglas Hideki Nakahata, Marcos Alberto de Carvalho, Fernando Rodrigues Goulart Bergamini et Pedro Paulo Corbi. « N,N′,N′′versus N,N′,Oimine-containing coordination motifs : ligand-directed synthesis of mononuclear and binuclear CuIIcompounds ». Acta Crystallographica Section E Crystallographic Communications 73, n^o 10 (29 septembre 2017) : 1563–67. http://dx.doi.org/10.1107/s2056989017013652.

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It is demonstrated here that tridentate imine ligands can control the nuclearity of copper(II) complexes based on the donor atoms present in the ligand. TheN,N′,N′′-donating imine ligand led to a mononuclear compound, namely dichlorido[N,N-dimethyl-N′-(pyridin-2-ylmethylidene)ethane-1,2-diamine]copper(II) monohydrate, [CuCl2(C10H15N3)]·H2O,1, while theN,N′,O-donating imine ligand produced a binuclear metal complex, namely μ2-chlorido-dichlorido(μ2-2-{[2-(dimethylamino)ethyl]iminomethyl}phenolato)(N,N-dimethylethylenediamine)dicopper(II) 0.11-hydrate, [Cu2(C11H15N2O)Cl3(C4H12N2)]·0.11H2O,2. The structure of2is a remarkable example of a binuclear copper(II) complex containing a single substituted 2-iminomethylphenolate ligand that has two copper(II) sites in square-pyramidal coordination.

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Bernhard, P., DJ Bull, WT Robinson et AM Sargeson. « The Synthesis and Properties of an Encapsulated Ruthenium(II) Ion by an N3S3 Macrobicyclic Ligand ». Australian Journal of Chemistry 45, n^o 8 (1992) : 1241. http://dx.doi.org/10.1071/ch9921241.

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The complex [ Ru(capten)]2+ ( capten = 1-methyl-3,13,16-trithia-6,10,19-triazabicyclo[6.6.6]- icosane ) has been synthesized from [ Ru ( dmf )6]2+ ( dmf = N,N- dimethylformamide ) and the free ligand . An X-ray crystallographic analysis of [ Ru ( capten )] (CF3SO3)2 at 138 K reveals a lel3 conformation of the ligand with an average II-N bond length of 2.136(5) � and an average RuII-S bond length of 2.284(8) � . Visible spectra and the redox potential (1.26 V v. n.h.e .) show that the RuII state is stabilized by c. 0.9 V relative to the complex with six nitrogen donor atoms. Oxidation of Ru11 to RuIIIin acetonitrile leads to dehydrogenation of the ligand to form an imine. Successive oxidations lead to a triimine species where all the imines are located in the ligand cap. These oxidation processes are inferred to take place through RuIV intermediates which decay by intramolecular 2e- steps to the imine.

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Eliseev, Ivan I., Nadezhda A. Bokach, Matti Haukka et Irina A. Golenya. « cis-Dichlorido(dimethyl sulfoxide-κS)(N,N,N′,N′-tetramethylguanidine-κN′′)platinum(II) ». Acta Crystallographica Section E Structure Reports Online 69, n^o 2 (19 janvier 2013) : m117—m118. http://dx.doi.org/10.1107/s160053681300130x.

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In the title compound,cis-[PtCl2(C5H13N3)(C2H6OS)], the four-coordinate PtIIatom is bonded to one N atom of theN,N,N′,N′-tetramethylguanidine ligand, one dimethyl sulfoxide S atom and two chloride ligands, forming acis-square-planar geometry. The bond lengths and angles of the N—Pt—Cl functionality are typical for imine dichloridoplatinum(II) complexes. The H atom of the imino group is oriented towards the O atom of the sulfoxide group of a neighboring molecule and forms an N—H...O hydrogen bond.

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Adeleke, Adesola A., Sizwe J. Zamisa et Bernard Omondi. « Ag(I) Complexes of Imine Derivatives of Unexpected 2-Thiophenemethylamine Homo-Coupling and Bis-(E)-N-(furan-2-ylmethyl)-1-(quinolin-2-yl)methanimine ». Molbank 2021, n^o 2 (12 juin 2021) : M1235. http://dx.doi.org/10.3390/m1235.

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Imines are fundamental organic compounds used as synthetic intermediates and as ligands in coordination chemistry. They are also found to be important pharmacophores in various bioactive compounds. In this report, two Schiff bases were prepared using the traditional condensation of 4-pyridinecarboxaldehyde with 2-thiophenemethylamine and 2-quinolinecarboxaldehyde with furfurylamine to form (E)-1-(pyridin-4-yl)-N-(thiophen-2-ylmethyl)methanimine (L1) and (E)-N-(furan-2-ylmethyl)-1-(quinolin-2-yl)methanimine (L2) respectively. L1 and L2 were complexed with silver perchlorate in 2:1 [M:L] stoichiometry to obtain complexes 1 and 2, respectively. The crystal structures of 1 and 2 were unequivocally determined by single-crystal X-ray diffraction analysis. The resulting structures revealed 2 to be a four-coordinate as expected. In contrast, an unexpected chemoselective hydrolytic cleavage of one mole of the (CH=N) imine ligands occurred in complex 2 and, further, the amines (thiophenemethylamine) homo-coupled to form a new imine ligand derivative in situ (L1a) before coordinating to the Ag(I) center along with L1. This observation described an alternative synthetic route to be explored to synthesize a diverse range of imine derivatives, which involves the Ag(I)-promoted homo-coupling of amines. Herein, the crystal structures of Ag(I) complexes of pyridinyl [Ag(L1)(L1a)]ClO4 (1) and quinolinyl [Ag(L2)2]ClO4 (2) Schiff bases are presented.

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Khalaf, Mai M., Hany M. Abd El-Lateef, Abdulrahman Alhadhrami, Fatma N. Sayed, Gehad G. Mohamed, Mohamed Gouda, Saad Shaaban et Ahmed M. Abu-Dief. « Synthesis, Spectroscopic, Structural and Molecular Docking Studies of Some New Nano-Sized Ferrocene-Based Imine Chelates as Antimicrobial and Anticancer Agents ». Materials 15, n^o 10 (20 mai 2022) : 3678. http://dx.doi.org/10.3390/ma15103678.

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The newly synthesized organometallic acetyl ferrocene imine ligand (HL) was obtained by the direct combination of 2-acetyl ferrocene with 2-aminothiophenol. The electronic and molecular structure of acetyl ferrocene imine ligand (HL) was refined theoretically and the chemical quantum factors were computed. Complexes of the acetyl ferrocene imine ligand with metal(II)/(III) ions (Cr(III), Mn(II), Fe(III), Co(II), Ni(II), Cu(II), Zn(II) and Cd(II)) were fabricated. They were inspected by thermal (DTG /TG), spectroscopic techniques (FT-IR, 1H NMR, mass, UV–Vis), molar conductivity, and CHNClM to explicate their structures. Studies using scanning electron microscope (SEM) were conducted on the free acetyl ferrocene imine ligand and its Cd(II) chelate to confirm their nano-structure. To collect an idea about the effect of metal ions on anti-pathogenic properties upon chelation, the newly synthesized acetyl ferrocene imine ligand and some of its metal chelates were tested against a variety of microorganisms, including Bacillus subtilis, Staphylococcus aureus, Salmonella typhimurium, Escherichia coli, Aspergillus fumigatus, and Candida albicans. The ligand and its metal chelate were tested for cytotoxic activity in human cancer (MCF-7 cell viability) and human melanocyte cell line HBF4. It was discovered that the Cd(II) chelate had the lowest IC50 of the three and thus had the prior activity. Molecular docking was utilized to investigate the interaction of acetyl ferrocene imine ligand (HL) with the receptors of the vascular endothelial growth factor receptor VEGFR (PDB ID: 1Y6a), human Topo IIA-bound G-segment DNA crystal structure (PDB ID: 2RGR), and Escherichia coli crystal structure (PDB ID: 3T88).

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Zabłocka, Maria, Alain Igau, Victorio Cadierno, Marek Koprowski et Jean-Pierre Majoral. « α-Phosphino-Imine Ligand Design ». Phosphorus, Sulfur, and Silicon and the Related Elements 177, n^o 8-9 (août 2002) : 1965. http://dx.doi.org/10.1080/10426500213421.

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Zabierowski, Piotr, Janusz Szklarzewicz et Wojciech Nitek. « Disentangling steric and electronic factors in monomeric bis(2-bromo-4-chloro-6-{[(2-hydroxyethyl)imino]methyl}phenolato-κ2N,O)copper(II) ». Acta Crystallographica Section C Structural Chemistry 70, n^o 7 (6 juin 2014) : 659–61. http://dx.doi.org/10.1107/s2053229614012273.

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The title compound, [Cu(C9H8BrClNO2)2], is a square-planar complex. The potentially tridentate dibasic 2-bromo-4-chloro-6-{[(2-hydroxyethyl)imino]methyl}phenolate ligand coordinates in atrans-bis fashion to the CuIIcentreviathe imine N and phenolate O atoms. The CuIIatom lies on the centre of inversion of the molecule. The potentially coordinating hydroxyethyl group remains protonated and uncoordinated, taking part in intermolecular hydrogen bonds with vicinal groups, leading to the formation of a two-dimensional hydrogen-bond network with sheets parallel to the (10\overline{1}) plane. Substituent effects on the crystal packing and coordination modes of the ligand are discussed.

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10

Li, Mingyuan, Hu Zhang, Zhengguo Cai et Moris S. Eisen. « Norbornene polymerization and copolymerization with 1-alkenes by neutral palladium complexes bearing aryloxide imidazolin-2-imine ligand ». Polymer Chemistry 10, n^o 21 (2019) : 2741–48. http://dx.doi.org/10.1039/c9py00176j.

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11

Khalaf, Mai M., Hany M. Abd El-Lateef, Mohamed Gouda, Fatma N. Sayed, Gehad G. Mohamed et Ahmed M. Abu-Dief. « Design, Structural Inspection and Bio-Medicinal Applications of Some Novel Imine Metal Complexes Based on Acetylferrocene ». Materials 15, n^o 14 (12 juillet 2022) : 4842. http://dx.doi.org/10.3390/ma15144842.

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Some novel imine metal chelates with Cr3+, Mn2+, Fe3+, Co2+, Ni2+, Cu2+, Zn2+, and Cd2+ cations were produced from 2-acetylferrocene and 3-aminophenol. The new acetylferrocene azomethine ligand ((Z)-cyclopenta-1,3-dien-1-yl(2-(1-((3-hydroxyphenyl)imino)ethyl)cyclopenta-2,4-dien-1-yl)iron) and its metal ion chelates were constructed and elucidated using FT-IR, UV/Vis, 1HNMR, DTA/TGA, CHNClM studies, mass spectrometry and SEM analysis. According to the TGA/DTG investigation, the ferrocene moiety spontaneously disintegrates to liberate FeO. The morphology of the free acetylferrocene azomethine via SEM analysis was net-shaped with a size of 64.73 nm, which differed in Cd(II) complex to be a spongy shape with a size of 42.43 nm. The quantum chemical features of the azomethine ligand (HL) were computed, and its electronic and molecular structure was refined theoretically. The investigated acetylferrocene imine ligand behaves as bidinetate ligand towards the cations under study to form octahedral geometries in case of all complexes except in case of Zn2+ is tetrahedral. Various microorganisms were used to investigate the anti-pathogenic effects of the free acetylferrocene azomethine ligand and its metal chelates. Moreover, the prepared ligand and its metal complexes were tested for anticancer activity utilizing four different concentrations against the human breast cancer cell line (MCF7) and the normal melanocyte cell line (HBF4). Furthermore, the binding of 3-aminophenol, 2-acetylferrocene, HL, Mn2+, Cu2+, and Cd2+ metal chelates to the receptor of breast cancer mutant oxidoreductase was discovered using molecular docking (PDB ID: 3HB5).

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Zhang, Qi-Wei, et Gui-Xian Wang. « {2-[3-(Dimethylammonio)propyliminomethyl]-6-methoxyphenolato}diisothiocyanatozinc(II) chloroform solvate ». Acta Crystallographica Section E Structure Reports Online 63, n^o 3 (7 février 2007) : m652—m653. http://dx.doi.org/10.1107/s1600536807004497.

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The Zn atom in the title compound, [Zn(NCS)2(C13H20N2O2)]·CHCl3, is coordinated by two N atoms of two isothiocyanate ligands, and an O and an imine N atom from the neutral Schiff base ligand 2-[3-(dimethylammonio)propyliminomethyl]-6-methoxyphenolate, in a distorted tetrahedral geometry.

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Coles, Alec, Oskar Wood et Chris Hawes. « Ligands containing 7-azaindole functionality for inner-sphere hydrogen bonding : structural and photophysical investigations ». Journal of the Serbian Chemical Society, n^o 00 (2023) : 61. http://dx.doi.org/10.2298/jsc230623061c.

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The synthesis, structural analysis and spectroscopic characterisation of three new 7-azaindole ligands is reported, alongside a novel 7-azaindole derived coordination polymer, with the aim of identifying new bridging ligands containing inner-sphere hydrogen bond donor functionality. Structural characterisation shows that the 7-azaindole hydrogen bond donor ability is significantly stronger in the hydrazone and imine species 1 and 2 compared to the amine 3, with the opposite trend evident in their hydrogen bond acceptor character. These findings are mirrored by the fluorescence spectroscopy results which show bimodal emission, characteristic of multiple emissive species related by proton transfer, is only evident in the amine species and not the more acidic imines. The polymeric copper(II) complex of the hydrazone ligand 1 shows the anticipated inner-sphere hydrogen bonding with a similar donor strength to that observed in the free ligand, which leads to deformation in the remainder of the coordination sphere. These results show the untapped versatility of the 7-azaindole functional group as a building block for ligands in coordination polymers and other multinuclear assemblies, with the potential for both stabilisation through hydrogen bonding and interesting photophysical properties.

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Skokan, Shayna R., Monica M. Reeson, Kayode D. Oshin, Anastasiya I. Vinokur, John A. Desper et Christopher J. Levy. « Crystal structure of {(R)-N2-[(benzo[h]quinolin-2-yl)methyl]-N2′-[(benzo[h]quinolin-2-yl)methylidene]-1,1′-binaphthyl-2,2′-diamine-κ4N,N′,N′′,N′′′}(trifluoromethanesulfonato-κO)zinc(II)} trifluoromethanesulfonate dichloromethane 1.5-solvate ». Acta Crystallographica Section E Crystallographic Communications 73, n^o 7 (2 juin 2017) : 949–53. http://dx.doi.org/10.1107/s2056989017008027.

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The zinc(II) atom in the title compound, [Zn(C48H31N4)(CF3SO3)](CF3SO3)·1.5CH2Cl2, adopts a distorted five-coordinate square-pyramidal geometry. It is coordinated by one trifluoromethanesulfonate ligand and four N atoms of theN2-[(benzo[h]quinolin-2-yl)methyl]-N2′-[(benzo[h]quinolin-2-yl)methylidene]-1,1′-binaphthyl-2,2′-diamine ligand. The complex is present as a single-strandedP-helimer monohelical structure incorporating π–π and/or σ–π interactions. One of the imine bonds present in the original ligand framework is reduced, leading to variations in bond lengths and torsion angles for each side of the ligand motif. The imine-bond reduction also affects the bond lengths involving the metal atom with the N-donor atoms located on the imine bond. There are two molecules of the complex in the asymmetric unit. One of the molecules exhibits positional disorder within the coordinating trifluoromethanesulfonate ion making the molecules symmetrically non-equivalent.

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Luong Xuan, Dien. « Syntheses and Characterizations of Platinum Complexes with New Pyrene-based Salicylaldiminato-type Ligand Substituted at 7-Position of Pyrene ». Vietnam Journal of Catalysis and Adsorption 10, n^o 2 (10 septembre 2021) : 26–35. http://dx.doi.org/10.51316/jca.2021.024.

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Many experimental data show that bulky substituents on the molecules enhance solubility, catalytic activity, and photophysical properties due to the prevention of π-π stacking in metal salicylaldimines. In order to understand the effect of bulkiness of substituents on the properties of the obtained molecules, the author researched and synthesized two new pyrene-based salicylaldiminato-type ligands that were substituted at 7-position and functionalized on imine group with bulky substituents. After the introduction of the tert-butyl group at 7-position of pyrene by Friedel-Crafts reaction, the syntheses of new ligands 1-hydroxy-2-[((2,6-dimethylphenyl)-imino)methyl]-7-(tert-butyl)-pyrene 3, 2-hydroxy-1- [((2,6-dimethylphenyl)imino)methyl]-7-(tert-butyl)-pyrene 4 and corresponding platinum complexes 3(Pt), 4(Pt) were performed in the different ways with the synthetic processes of the complexes 1(Pt) and 2(Pt). The new ligands and complexes were characterized by 1H NMR, IR spectroscopy, mass spectroscopy, elemental analysis and X-ray diffraction, only for 3(Pt). In addition to measurements of the absorption and emission spectra, TDDFT calculations using the B3LYP functions were also performed. The complexes 3(Pt) and 4(Pt) exhibit good solubility and red-shift in absorption and emission spectra because of tert-butyl group at 7-position of pyrene and extension of the delocalized π-orbitals to the 2,6-dimethylphenyl on imine group. The change of functional groups also induces the upfield shift of the protons affected by ring currents of phenyl groups Ar-3, Ar-4 on imine groups. Introduction of t-butyl groups in pyrene moieties can stabilize radical forms in oxidation processes.

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Shaban, Shaban Y., Ralph Puchta et Rudi van Eldik. « Five-coordinate Zinc(II) Complexes Containing Sterically Demanding Bio-mimetic N3S2 Ligands. Syntheses, Characterization and DFT Calculations ». Zeitschrift für Naturforschung B 65, n^o 3 (1 mars 2010) : 251–57. http://dx.doi.org/10.1515/znb-2010-0305.

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In search of complexes having [ZnN3S2] cores in the monomeric form with trans-thiolate donor atoms, new sterically demanding tri- and pentadentate ligands containing biomimetic N3S2 cores have been synthesized. The reaction of bis(2-mercapto-3,5-di-tert-butylaniline)zinc(II) with 2,6- diacetylpyridine leads to the formation of the zinc imine [Zn(pytBuN2Me2S2)] (3) which is stable and can be isolated and characterized in the solid state. Complex 3 can be converted to the zinc amine function [Zn(pytBuN2H2Me2S2)] (5) without losing the metal center using NaBH4 in methanol solution. On the other hand, complex 3 can be demetallated in an acidic medium to give the tridentate bis-benzothiazoline ligand 4. Alternatively, ligand 4 can be obtained via condensation of 3,5-di-tertbutylmercaptoaniline with 2,6-diacetylpyridine in a 2:1 molar ratio. Opening the bis-benzothiazoline ligand 4 either by reduction with NaBH4 in methanol or by zinc acetate leads to the formation of the pentadentate dithiole-amine ligand pytBuN2H2Me2S2-H2 (6), and the zinc imine complex 3, respectively. Ligand 6 can also be obtained via demetallation of the zinc amine complex 5 in acidic medium. All compounds have been characterized using spectroscopic methods and elemental analysis, and also by using DFT (B3LYP/6-31G∗) calculations in combination with experimental NMR data.

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Müller, Gabi, Martti Klinga, Peter Osswald, Markku Leskelä et Bernhard Rieger. « Palladium Complexes with Bidentate P,N Ligands : Synthesis, Characterization and Application in Ethene Oligomerization ». Zeitschrift für Naturforschung B 57, n^o 7 (1 juillet 2002) : 803–9. http://dx.doi.org/10.1515/znb-2002-0713.

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Palladium complexes of two different P,N ligands (a phosphane-pyridine and a phosphane-imine ligand) were synthesized and characterized. Single crystal X-ray structure analyses of the palladium diiodide compounds revealed a square-planar coordination geometry at the metal center with a longer Pd-I bond in trans-position to the phosphorus atom. The chloro-methyl palladium species of the phosphane-pyridine ligand was applied for the oligomerization of ethene using a borate salt as cocatalyst.

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Chan, Tek Long, et Zuowei Xie. « The synthesis, structure and reactivity of an imine-stabilized carboranylphosphorus(i) compound ». Chemical Communications 52, n^o 45 (2016) : 7280–83. http://dx.doi.org/10.1039/c6cc03368g.

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An imine-stabilized carboranylphosphorus(i) compound has been synthesized, where the imine moiety serves as a σ donor and sterically demanding carboranyl ligand prevents the dimerization, which has been supported by single-crystal X-ray analyses, DFT calculations and reactivity studies.

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Esmaeilzadeh, J., Z. Mardani, K. Moeini, C. Carpenter-Warren, A. M. Z. Slawin et J. D. Woollins. « Coordination of an amino alcoholic Schiff base ligand toward the zinc(II) ion : spectral, structural, theoretical, and docking studies ». Журнал структурной химии 63, n^o 2 (2022) : 233. http://dx.doi.org/10.26902/jsc_id88425.

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A new zinc(II) complex of 2-(((2-((2-hydroxyethyl)amino)ethyl)imino)methyl)phenol (L), [Zn(Lz)Br2] (1), is prepared and identified by elemental analysis, FTIR and 1H NMR spectroscopy, and single crystal X-ray diffraction. The X-ray structure analysis of 1 reveals a tetrahedrally coordinated zinc(II) complex containing the NO-donor amino alcoholic Schiff base ligand and two bromo ligands. After complexation, the ligand (L) converts to its zwitterionc form (Lz) of phenol → phenolate; amine → ammonium. In this structure, hydrogen bonds between amine and alcohol units form different types of hydrogen bond motifs, including R21(7), R22(7), R22(10), R44(24), R44(30), R66(38), and R66(44). In addition to the hydrogen bonds in this crystal network, there are π—π stacking interactions between the phenyl ring and the imine group. The ability of the ligand and its isostructural complexes [Zn(Lz)Br2] (1), [Zn(Lz)Cl2] (2), and [Zn(Lz)I2] (3) to interact with ten selected biomacromolecules (BRAF kinase, CatB, DNA gyrase, HDAC7, rHA, RNR, TrxR, TS, Top II, and B-DNA) is investigated by docking studies. The results show that in some cases, the studied compound can interact with proteins and DNA better than doxorubicin. The charge distribution pattern of the ligand and complex 1 is studied by the NBO analysis.

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Esmaeilzadeh, J., Z. Mardani, K. Moeini, C. Carpenter-Warren, A. M. Z. Slawin et J. D. Woollins. « Coordination of an amino alcoholic Schiff base ligand toward the zinc(II) ion : spectral, structural, theoretical, and docking studies ». Журнал структурной химии 63, n^o 2 (2022) : 233. http://dx.doi.org/10.26902/jsc_id88425.

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A new zinc(II) complex of 2-(((2-((2-hydroxyethyl)amino)ethyl)imino)methyl)phenol (L), [Zn(Lz)Br2] (1), is prepared and identified by elemental analysis, FTIR and 1H NMR spectroscopy, and single crystal X-ray diffraction. The X-ray structure analysis of 1 reveals a tetrahedrally coordinated zinc(II) complex containing the NO-donor amino alcoholic Schiff base ligand and two bromo ligands. After complexation, the ligand (L) converts to its zwitterionc form (Lz) of phenol → phenolate; amine → ammonium. In this structure, hydrogen bonds between amine and alcohol units form different types of hydrogen bond motifs, including R21(7), R22(7), R22(10), R44(24), R44(30), R66(38), and R66(44). In addition to the hydrogen bonds in this crystal network, there are π—π stacking interactions between the phenyl ring and the imine group. The ability of the ligand and its isostructural complexes [Zn(Lz)Br2] (1), [Zn(Lz)Cl2] (2), and [Zn(Lz)I2] (3) to interact with ten selected biomacromolecules (BRAF kinase, CatB, DNA gyrase, HDAC7, rHA, RNR, TrxR, TS, Top II, and B-DNA) is investigated by docking studies. The results show that in some cases, the studied compound can interact with proteins and DNA better than doxorubicin. The charge distribution pattern of the ligand and complex 1 is studied by the NBO analysis.

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Clegg, William, Ross W. Harrington, Kazem Barati, Mohammad Hossein Habibi, Morteza Montazerozohori et Arash Lalegani. « Synthesis, characterization and crystal structures of the bidentate Schiff baseN,N′-bis(2-nitrocinnamaldehyde)ethylenediamine and its complex with CuNCS and triphenylphosphane ». Acta Crystallographica Section C Structural Chemistry 71, n^o 7 (18 juin 2015) : 578–83. http://dx.doi.org/10.1107/s2053229615010815.

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Reaction of copper(I) thiocyanate and triphenylphosphane with the bidentate Schiff baseN,N′-bis(trans-2-nitrocinnamaldehyde)ethylenediamine {Nca2en, (1); systematic name (1E,1′E,2E,2′E)-N,N′-(ethane-1,2-diyl)bis[3-(2-nitrophenyl)prop-2-en-1-imine]}, C20H18N4O4, in a 1:1:1 molar ratio in acetonitrile resulted in the formation of the complex {(1E,1′E,2E,2′E)-N,N′-(ethane-1,2-diyl)bis[3-(2-nitrophenyl)prop-2-en-1-imine]-κ2N,N′}(thiocyanato-κN)(triphenylphosphane-κP)copper(I)], [Cu(NCS)(C20H18N4O4)(C18H15P)] or [Cu(NCS)(Nca2en)(PPh3)], (2). The Schiff base and copper(I) complex have been characterized by elemental analyses, IR, electronic and1H NMR spectroscopy, and X-ray crystallography [from synchrotron data for (1)]. The molecule of (1) lies on a crystallographic inversion centre, with atransconformation for the ethylenediamine unit, and displays significant twists from coplanarity of its nitro group, aromatic ring, conjugated chain and especially ethylenediamine segments. It acts as a bidentate ligand coordinatingviathe imine N atoms to the CuIatom in complex (2), in which the ethylenediamine unit necessarily adopts a somewhat flattenedgaucheconformation, resulting in a rather bowed shape overall for the ligand. The NCS−ligand is coordinated through its N atom. The geometry around the CuIatom is distorted tetrahedral, with a small N—Cu—N bite angle of 81.56 (12)° and an enlarged opposite angle of 117.29 (9)° for SCN—Cu—P. Comparisons are made with the analogous Schiff base having no nitro substituents and with metal complexes of both ligands.

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Li, Yan, Qing Ma, Hua-Tian Shi, Qun Chen et Qian-Feng Zhang. « Syntheses and Crystal Structures of Ruthenium-Salen Complexes Containing Triphenylphosphine Ligands ». Zeitschrift für Naturforschung B 66, n^o 3 (1 mars 2011) : 324–28. http://dx.doi.org/10.1515/znb-2011-0316.

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Treatment of [Ru(PPh3)3Cl2] with the Schiff base ligand H2salen in THF at reflux afforded a neutral RuIIIsalen complex [RuIII(salen)(PPh3)Cl] (1). Interaction of [RuHCl(CO)(PPh3)3] with H2salen under similar conditions gave a neutral RuII-salen complex [RuII(salen- NH)(PPh3)(CO)] (2). In its formation one of the imine bonds was nucleophilically attacked by hydride to give a mixed imine-amine ligand. The two complexes have been spectroscopically characterized, and the crystal structures of 1 · 2CH2Cl2 and 2 · CH2Cl2 have been established by X-ray crystallography.

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Vasilenko, Vladislav, Torsten Roth, Clemens K. Blasius, Sebastian N. Intorp, Hubert Wadepohl et Lutz H. Gade. « A modular approach to neutral P,N-ligands : synthesis and coordination chemistry ». Beilstein Journal of Organic Chemistry 12 (29 avril 2016) : 846–53. http://dx.doi.org/10.3762/bjoc.12.83.

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We report the modular synthesis of three different types of neutral κ2-P,N-ligands comprising an imine and a phosphine binding site. These ligands were reacted with rhodium, iridium and palladium metal precursors and the structures of the resulting complexes were elucidated by means of X-ray crystallography. We observed that subtle changes of the ligand backbone have a significant influence on the binding geometry und coordination properties of these bidentate P,N-donors.

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Lorenzini, Fabio, Pierre-Louis Lagueux-Tremblay, Laure V. Kayser, Ethan Anderson et Bruce A. Arndtsen. « Synthesis, structure and palladium coordination of ambiphilic, pyridine- and phosphine-tethered N-boryl imine ligands ». Dalton Transactions 48, n^o 17 (2019) : 5766–72. http://dx.doi.org/10.1039/c8dt05100c.

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Masuda, Jason D., Pingrong Wei et Douglas W. Stephan. « Nickel and palladium phosphinimine-imine ligand complexes ». Dalton Transactions, n^o 18 (2003) : 3500. http://dx.doi.org/10.1039/b306110h.

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Ismaiel Mahjoub Muslah, Safa, Ammar J. Alabdali et Nasser D. Shaalan. « Synthesis of Binuclear Complexes of Cu (II), Ni (II) and Cr (III) Metal Ions Derived from Di-Imine Compound as Biterminal Binding Site Ligand ». Al-Nahrain Journal of Science 23, n^o 4 (1 décembre 2020) : 19–28. http://dx.doi.org/10.22401/anjs.23.4.04.

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The research is concerning synthesis of two di-imine ligands derived from thiadiazole heterocyclic compounds. 1, 3, 4-thiadiazole-2, 5-dihydrazino is considered as ligand (L1) and starting essential compound that used as precursor to synthesize the new ligand (2, 2'-(((1,3,4-thiadiazole-2,5-diyl)bis(hydrazin-2yl1ylidene))bis (methaneylylide)) diphenol (L2). Six new complexes were derived from the ligands using some transition metal ions like Cu(II), Ni(II), and Cr(III).The synthesized compounds characterized by infra-red, ultra-violet-visible and gas chromatography-mass spectroscopy, conductivity, and thermal analysis. The coordination modes were suggested to be N2from two terminals to form binuclear complexes. The mentioned characterization methods showed that the prepared complexes may have chelation pattern (bidentate or tridentate) depending on the suggested geometry (square planer or octahedral) and the type of ligand.

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Gerlach, Daniela, Andreas W. Ehlers, Koop Lammertsma et Jörg Wagler. « Silicon(IV) Chelates of an (ONN')-Tridentate Pyrrole-2-Carbaldimine Ligand : Syntheses, Structures and UV/Vis Properties ». Zeitschrift für Naturforschung B 64, n^o 11-12 (1 décembre 2009) : 1571–79. http://dx.doi.org/10.1515/znb-2009-11-1242.

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The tridentate (ONN_)-chelator properties of the pyrrole-2-(o-hydroxyphenyl)carbaldimine dianion (L2−) were explored for the neutral penta-coordinate diorganosilicon complexes LSiRR' (R,R' = Ph, Ph; Ph, Me; Ph, tBu) where the ligand L occupies the ax-eq-ax sites in a distorted trigonalbipyramidal arrangement arround the silicon atom, and for the neutral hexa-coordinate L2Si, that has a mer-coordination. Single-crystal X-ray diffraction analyses show an almost planar ligand backbone with a Si-N bond to the imine group that is shorter in hexa-coordinate L2Si than in pentacoordinate LSiRR'. In sharp contrast to the almost colorless neutral ligand LH2, both complexes show pronounced UV/Vis absorptions in the red-brown region that originate from HOMO- LUMO and HOMO-1 -LUMO transitions, and that are due to intra-ligand π-π∗ transitions from the N-ooxyphenylimine towards the imine moiety

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Vieira, Rafael P., John R. Thompson, Heloisa Beraldo et Tim Storr. « Partial conversion of thioamide into nitrile in a copper(II) complex of 2,6-diacetylpyridine bis(thiosemicarbazone), a drug prototype for Alzheimer's disease ». Acta Crystallographica Section C Structural Chemistry 71, n^o 6 (7 mai 2015) : 430–34. http://dx.doi.org/10.1107/s205322961500813x.

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This work reports the crystal structure of [(Z)-2-((E)-1-{6-[1-({[amino(sulfanidyl-κS)methylidene]amino}imino-κN)ethyl]pyridin-2-yl-κN}ethylidene)-1-cyanohydrazinido-κN1]copper(II), [Cu(C11H11N7S)], the first description of a copper(II) complex of 2,6-diacetylpyridine bis(thiosemicarbazone) showing partial conversion of a thioamide group to a nitrile group. The asymmetric ligand coordinates to the metal centre in anN,N′,N′′,S-tetradentate mannerviathe pyridine N atom, an imine N atom, the hydrazinide N atom and the sulfanidyl S atom, displaying a square-planar geometry. Ligand coordination results in two five-membered chelate rings and one six-membered chelate ring, and in crystal packing based on N—H...N hydrogen bonds of the cyanohydrazinide and hydrazinecarbothioamidate arms of the ligand. The correlation between the partial conversion upon metal complexation, H2S release and possible effects on the activity of bis(thiosemicarbazone)s as drug prototypes for Alzheimer's disease is also discussed.

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Ghaemi, Akbar, Saeed Rayati, Kazem Fayyazi, Seik Weng Ng et Edward R. T. Tiekink. « {μ-2-[(3-Amino-2,2-dimethylpropyl)iminomethyl]-6-methoxyphenolato-1:2κ5O1,O6:N,N′,O1}{2-[(3-amino-2,2-dimethylpropyl)iminomethyl]-6-methoxyphenolato-1κ3N,N′,O1}-μ-azido-1:2κ2N:N-azido-2κN-methanol-2κO-dinickel(II) ». Acta Crystallographica Section E Structure Reports Online 68, n^o 8 (4 juillet 2012) : m1027—m1028. http://dx.doi.org/10.1107/s1600536812029662.

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Two distinct coordination geometries are found in the binuclear title complex, [Ni2(C13H19N2O2)2(N3)2(CH3OH)], as one Schiff base ligand is pentadentate, coordinatingviathe anticipated oxide O, imine N and amine N atoms (as for the second, tridentate, ligand) but the oxide O is bridging and coordination also occurs through the methoxy O atom. The NiIIatoms are linked by a μ2-oxide atom and one end of a μ2-azide ligand, forming an Ni2ON core. The coordination geometry for the NiIIatom coordinated by the tridentate ligand is completed by the methoxy O atom derived from the pentadentate ligand, with the resulting N3O3donor set defining afacoctahedron. The second NiIIatom has itscis-octahedral N4O2coordination geometry completed by the imine N and amine N atoms of the pentadentate Schiff base ligand, a terminally coordinated azide N and a methanol O atom. The arrangement is stabilized by an intramolecular hydrogen bond between the methanol H and the oxide O atom. Linear supramolecular chains along theaaxis are formed in the crystal packing whereby two amine H atoms from different amine atoms hydrogen bond to the terminal N atom of the monodentate azide ligand.

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Liu, Chong, Jian-Hua Xie, Gui-Long Tian, Wei Li et Qi-Lin Zhou. « Highly efficient hydrogenation of carbon dioxide to formate catalyzed by iridium(iii) complexes of imine–diphosphine ligands ». Chemical Science 6, n^o 5 (2015) : 2928–31. http://dx.doi.org/10.1039/c5sc00248f.

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Al-hamidi, Jehan, Abdulhamid Alsaygh et Ibrahim Al-Najjar. « Hydridothiazole Rhodium Complexes as a Result of C-H Bond Activation in Iminothiazoles Chelating Ligands ». Open Chemistry Journal 1, n^o 1 (31 décembre 2014) : 27–32. http://dx.doi.org/10.2174/1874842201401010027.

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A series of 20 Schiff base ligands derived from 2-aminothiazole and its derivatives and aryl aldehydes with either [RhCl(PPh3)3] or [Rh(µ-Cl)(COD)]2 in the presence of 4 equivalents of PPh3 lead to an Rh(III) cyclometallated complex and the imine ligand (C-H) bond has been added to the metal (C-M-H). The complexes were investigated by using I.R., 1H, 13C and 31P NMR Spectroscopic techniques. The signal of the (C-H) ligand was observed as trans to the nitrogen atom in the complex which is a donor ligand. Graphical Abstract: Total synthesis of hydridothiazole rhodium complexes possessing rhodium hydride signal at δ (-14.60 to-15.04) ppm, trans to N-donor ligand and iminoyl carbon (7C=N) signal in Rh (III) observed at δ (220.1-237.6)ppm, lower field and suggestive of carbine like properties.

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Chen, Chien-An, Liang-Ying Chiang et Han-Mou Gau. « Dichlorido(N,N′-dibenzylideneethane-1,2-diamine-κ2 N,N′)[(2,2-dimethyl-1,3-dioxolane-4,5-diyl)bis(diphenylmethanolato)-κ2 O,O′]titanium(IV) ». Acta Crystallographica Section E Structure Reports Online 63, n^o 11 (31 octobre 2007) : m2842—m2843. http://dx.doi.org/10.1107/s1600536807052725.

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The title compound, [TiCl2(C31H28O4)(C16H16N2)], is a titanium(IV) complex of the bidentate 2,2-dimethyl-α,α,α′,α′-tetraphenyl-1,3-dioxolane-4,5-dimethanolate (TADDOLate) ligand containing also two chloride ions and a bidentate neutral N,N′-dibenzylideneethane-1,2-diamine ligand. The molecular structure has a distorted octahedral geometry around the titanium metal center. The Ti—N bond lengths of 2.246 (2) and 2.2476 (17) Å are long, indicating weak bonding between the titanium(IV) metal center and the imine N atoms. Though the two chloride ligands are trans to each other, they bend away from the Ti–TADDOLate bonds with a Cl—Ti—Cl angle of 163.96 (3)°.

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Maroń, Anna M., Agata Szlapa-Kula, Marek Matussek, Rafal Kruszynski, Mariola Siwy, Henryk Janeczek, Justyna Grzelak, Sebastian Maćkowski, Ewa Schab-Balcerzak et Barbara Machura. « Photoluminescence enhancement of Re(i) carbonyl complexes bearing D–A and D–π–A ligands ». Dalton Transactions 49, n^o 14 (2020) : 4441–53. http://dx.doi.org/10.1039/c9dt04871e.

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Zhang, Yufan, Xin Chen, Bin Zheng, Xunmin Guo, Yupeng Pan, Hailong Chen, Huaifeng Li et al. « Structural analysis of transient reaction intermediate in formic acid dehydrogenation catalysis using two-dimensional IR spectroscopy ». Proceedings of the National Academy of Sciences 115, n^o 49 (19 novembre 2018) : 12395–400. http://dx.doi.org/10.1073/pnas.1809342115.

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The molecular structure of a catalytically active key intermediate is determined in solution by employing 2D IR spectroscopy measuring vibrational cross-angles. The formate intermediate (2) in the formic acid dehydrogenation reaction catalyzed by a phosphorus–nitrogen PN3P–Ru catalyst is elucidated. Our spectroscopic studies show that the complex features a formate ion directly attached to the Ru center as a ligand, and a proton added to the imine arm of the dearomatized PN3P* ligand. During the catalytic process, the imine arms are not only reversibly protonated and deprotonated, but also interacting with the protic substrate molecules, effectively serving as the local proton buffer to offer remarkable stability with a turnover number (TON) over one million.

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Tingare, Yogesh S., Chaochin Su, Ming-Tai Shen, Sheng-Han Tsai, Shih-Yu Ho, Subhendu Chakroborty et Wen-Ren Li. « Imine–carbene-based ruthenium complexes for dye-sensitized solar cells : the effect of isomeric mixture on the photovoltaic performance ». New Journal of Chemistry 44, n^o 47 (2020) : 20568–73. http://dx.doi.org/10.1039/d0nj02220a.

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Guerrero, Miguel, Lourdes Rivas, Teresa Calvet, Mercè Font-Bardia et Josefina Pons. « ZnII Complexes Based on Hybrid N-Pyrazole, N′-imine Ligands : Synthesis, X-Ray Crystal Structure, NMR Characterisation, and 3D Supramolecular Properties ». Australian Journal of Chemistry 68, n^o 5 (2015) : 749. http://dx.doi.org/10.1071/ch14344.

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The present report is on the synthesis of two new 3-imine-3,5-dimethylpyrazole ligands, N-[3-(3,5-dimethyl-1H-pyrazol-1-yl)propylidene]ethylamine (L1) and N-[3-(3,5-dimethyl-1H-pyrazol-1-yl)propylidene]propylamine (L2). These ligands form molecular complexes with the formula [ZnCl2(L)] (L = L1 (1) and L2 (2)) when the reacting with ZnCl2 in a metal (M)/ligand (L) ratio of 1 : 1. These new ZnII complexes have been characterised by elemental analyses, conductivity measurements, mass spectrometry, and infrared, 1H and 13C{1H} NMR spectroscopy techniques. The two crystalline structures of complexes 1 and 2 have been solved by X-ray diffraction methods. Finally, we have studied the self-assembly three-dimensional supramolecular structure through different intra- and intermolecular contacts. The application of these ZnII complexes in supramolecular crystal engineering is interesting due to (1) the easy preparation and the high efficiency of this system and (2) the different bonding properties of the heteroatoms (N-pyrazole vs N-imine) present in the structure of the ligands.

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Y. Al-Assafe, Amaal, et Rana A.S. Al-Quaba. « Synthesis, characterization and antibacterial studies of ciprofloxaci-imines and their complexes with oxozirconium(IV), dioxomolybdenum(VI), and dioxotungsten(VI) ». Bulletin of the Chemical Society of Ethiopia 38, n^o 4 (30 avril 2024) : 949–62. http://dx.doi.org/10.4314/bcse.v38i4.11.

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We synthesized and characterized ciprofloxacin-imine complexes, generated from ciprofloxacin and either 4-nitro-1,2-phenylenediamine (NO2PD) or 1,3-propanediamine (PD), in conjunction with zirconyl nitrate dihydrate, sodium molybdate dihydrate, and sodium tungstate dihydrate. Characterization involved numerous analytical methods, containing melting point determination, conductance dimensions, elemental analysis (CHN), metal content determination (%), infrared, electronic spectra, nuclear magnetic resonance, and mass spectrometry. Our findings reveal that the ligand as functions a tetra-dentate chelate binding to metal ions via azomethine and deprotonated carboxylate group. Additionally, the complexes and ligands were tested in contradiction of two types of bacteria (Staphylococcus aureus, Bacillus subtilis) and all prepared compounds showed good spectrum activity. KEY WORDS: 4-Nitro-1,2-phenylenediamine, Ciprofloxacin-imine, In-vitro antimicrobial activity, Zr complexes Bull. Chem. Soc. Ethiop. 2024, 38(4), 949-962. DOI: https://dx.doi.org/10.4314/bcse.v38i4.11

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Alaji, Zahra, Elham Safaei, Hong Yi, Hengjiang Cong, Andrzej Wojtczak et Aiwen Lei. « Redox active ligand and metal cooperation for C(sp2)–H oxidation : extension of the galactose oxidase mechanism in water-mediated amide formation ». Dalton Transactions 47, n^o 43 (2018) : 15293–97. http://dx.doi.org/10.1039/c8dt03477j.

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Dalal, Mahak, Nidhi Antil, K. K. Verma et Sapana Garg. « Synthesis, Spectroscopic Analysis, Antimicrobial and Antioxidant Screening of Some Organyltellurium(IV) Complexes ». Asian Journal of Chemistry 34, n^o 10 (2022) : 2551–60. http://dx.doi.org/10.14233/ajchem.2022.23758.

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In present study, six new organyltellurium(IV) Schiff base complexes with the formula RTeCl2·H4AP (1a-c) and R2TeCl·H4AP (1d-f), where R= 4-methoxyphenyl, 4-hydroxyphenyl and 3-methyl-4-hydroxyphenyl, ligand H4AP = 1-(((4-hydroxyphenyl)imino)methyl)-naphthalen-2-ol obtained from the condensation of 2-hydroxy-1-naphthaldehyde with 4-aminophenol were synthesized and characterized by elemental analysis, molar conductance, mass spectrometry, FT-IR, UV-visible, 1H NMR, 13C NMR spectroscopy. Correlation of all spectroscopic data suggested that Schiff base ligand (H4AP) acts as bidentate (ON) ligand coordinated to tellurium ion via naphthalene ring-O and imine-N with the distorted square pyramidal geometry around the tellurium ion. DFT based calculations were done for the ligand and its metal complexes to confirm the geometry of complexes. Chemical quantum parameters were determined for the ligand and the complexes. The antioxidant activity of the Schiff base and their organyltellurium(IV) complexes were assessed on the basis of radical scavenging effect of DPPH. The free Schiff base and its complexes were screened for the in vitro antifungal and antibacterial activity. The results show that the organyltellurium(IV) complexes were more active than the Schiff base. The molecular docking simulations carried out to study the probable binding modes of the ligand with various proteins receptors such as C. albicans and E. coli.

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Denker, Lars, Bartosz Trzaskowski et René Frank. « “Give me five” – an amino imidazoline-2-imine ligand stabilises the first neutral five-membered cyclic triel(i) carbenoides ». Chemical Communications 57, n^o 22 (2021) : 2816–19. http://dx.doi.org/10.1039/d1cc00010a.

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We designed an amino imidazoline-2-imine ligand, which stabilized neutral five-membered group 13 carbenoides. These new compound complete the gap between known four- and six-membered triel(i) carbenoides.

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Facchetti, Giorgio, et Isabella Rimoldi. « 8-Amino-5,6,7,8-tetrahydroquinoline in iridium(iii) biotinylated Cp* complex as artificial imine reductase ». New Journal of Chemistry 42, n^o 23 (2018) : 18773–76. http://dx.doi.org/10.1039/c8nj04558e.

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Yimthachote, Supajittra, Phongnarin Chumsaeng et Khamphee Phomphrai. « Complexity of imine and amine Schiff-base tin(ii) complexes : drastic differences of amino and pyridyl side arms ». Dalton Transactions 51, n^o 2 (2022) : 509–17. http://dx.doi.org/10.1039/d1dt02997e.

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A series of imine and amine Schiff-base tin(ii) complexes were synthesized. Complexes having dimethylamino side arm appears to be innocent while those having pyridyl side arm underwent unusual ligand dimerization.

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Bacher, Felix, James A. Isaac, Christian Philouze, David Flot, Aurore Thibon-Pourret et Catherine Belle. « Synthesis of unsymmetrical 1,8-naphthyridine-based ligands for the assembly of tri-and tetra-nuclear copper(ii) complexes ». New Journal of Chemistry 44, n^o 39 (2020) : 16713–20. http://dx.doi.org/10.1039/d0nj02776f.

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Exploring copper(ii) coordination from a new unsymmetrical naphthyridine-based ligand leads to the preparation of tetranuclear and trinuclear complexes. During the complexation, one imine group is oxidized to an amide group.

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Senthilkumaran, G., et S. Senthil. « Synthesis and Characterization of 1,2,3-Triazole Containing Fe(II) Sensor ». Asian Journal of Chemistry 32, n^o 5 (2020) : 1033–38. http://dx.doi.org/10.14233/ajchem.2020.22494.

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A new bis(1,2,3-triazolyl) imine based probe was designed and synthesized. Chemical structure of the probe was confirmed by IR, 1H and 13C NMR spectroscopy. The probe was investigated for its recognition abilities in aqueous-organic mixture against various cations and anions. It shows a highly selective colorimetric response to Fe(II) ion by changing the colour from colourless to brownish pink. Chemo-sensitivity of the probe was investigated by absorption spectrometric titration with the Fe(II) ions. 1H NMR titration studies indicated imine nitrogen and one of the nitrogen in triazole ring was involved in complex formation with Fe2+ ion. Energy optimization studies by DFT method exhibits a marginal energy gap between ligand and Fe(II) complex (0.1166 eV) confirms the formation of metal ligand complex.

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Enamullah, Mohammed, Imdadul Haque, Amina Khan Resma, Dennis Woschko et Christoph Janiak. « Schiff Base in Ketoamine Form and Rh(η4-cod)-Schiff Base Complex with Z′ = 2 Structure from Pairwise C-H···Metallochelate-π Contacts ». Molecules 28, n^o 1 (25 décembre 2022) : 172. http://dx.doi.org/10.3390/molecules28010172.

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Condensation of 2-hydroxybenzaldehyde (salicylaldehyde) or 2-hydroxy-1-naphthaldehyde with 2-ethylaniline yields the Schiff base compound of (E)-2-(((2-ethylphenyl)imino)methyl)phenol (HL1) or (E)-1-(((2-ethylphenyl)imino)methyl)naphthalen-2-ol (HL2), which in turn react with the dinuclear complex of [Rh(η4-cod)(µ-O2CCH3)]2 (cod = cycloocta-1,5-diene) to afford the mononuclear (η4-cod){(E)-2-(((2-ethylphenyl)imino)methyl)phenolato-κ2N,O}rhodium(I), [Rh(η4-cod)(L1)] (1) or (η4-cod){(E)-1-(((2-ethylphenyl)imino)methyl)naphthalen-2-olato-κ2N,O}rhodium(I), [Rh(η4-cod)(L2)] (2) (L1 or L2 = deprotonated Schiff base ligand). The X-ray structure determination revealed that the HL2 exists in the solid state not as the usual (imine)N···H-O(phenol) form (enolamine form) but as the zwitterionic (imine)N-H+···–O(phenol) form (ketoamine form). 1H NMR spectra for HL2 in different solvents demonstrated the existence of keto-enol tautomerism (i.e., keto ⇆ enol equilibrium) in solution. The structure for 1 and 2 showed that the deprotonated Schiff base ligand coordinates to the Rh(η4-cod)-fragment as a six-membered N^O-chelate around the rhodium atom with a close-to-square-planar geometry. Two symmetry-independent molecules (with Rh1 and Rh2) were found in the asymmetric unit in 1 in a structure with Z’ = 2. The supramolecular packing in HL2 was organized by π-π and C-H···π contacts, while only two recognized C-H···π contacts were revealed in 1 and 2. Remarkably, there were reciprocal or pairwise C-H···π contacts between a pair of each of the symmetry-independent molecules in 1. This pairwise C-H contact to the Rh-N^O chelate (metalloaromatic) ring may be a reason for the two symmetry-independent molecules in 1. Differential scanning calorimetry (DSC) analyses revealed an irreversible phase transformation from the crystalline-solid to the isotropic-liquid phase and subsequently confirmed the thermal stability of the compounds. Absorption spectra in solution were explained by excited state properties from DFT/TD-DFT calculations.

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Journal, Baghdad Science. « Complexes of Some Transition Metal with 2-Benzoyl thiobenzimidazole and 1,10-Phenanthroline and Studying their Antibacterial Activity ». Baghdad Science Journal 13, n^o 2 (5 juin 2016) : 84–94. http://dx.doi.org/10.21123/bsj.13.2.84-94.

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Mixed ligands of 2-benzoyl Thiobenzimiazole (L1) with 1,10-phenanthroline (L2) complexes of Cr(III) , Ni(II) and Cu(II) ions were prepared. The ligand and the complexes were isolated and characterized in solid state by using FT-IR, UV-Vis spectroscopy, 1H, 13C-NMR, flame atomic absorption, elemental micro analysis C.H.N.S, magnetic susceptibility , melting points and conductivity measurements. 2-Benzoyl thiobenzimiazole behaves as bidenetate through oxygen atom of carbonyl group and nitrogen atom of imine group. From the analyses Octahedral geometry was suggested for all prepared complexes. A theoretical treatment of ligands and their metal complexes in gas phase were studied using HyperChem-8 program, moreover, ligands in gas phase also has been studied using Gaussian program (GaussView Currently Available Version (5.0.9) along with Gaussian 09 which was the latest in the Gaussian series of programs). The antibacterial activity of the prepared complexes have been determined and compared with that of the ligand and the standard metronidazole.

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Keerthika, P., S. Balasubramaniyan et R. Govindharaju. « Diamagnetic Zn(II) and Hg(II) Complexes with Fluconazole : Synthesis, Spectral Characterization and Biological Investigation ». Biosciences Biotechnology Research Asia 20, n^o 2 (30 juin 2023) : 681–89. http://dx.doi.org/10.13005/bbra/3122.

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In order to create new mononuclear diamagnetic complexes (M = Zn (II) and Hg (II)), fluconazole and thiocyanate ion ligands were utilized. Physicochemical and spectroscopic approaches were used to describe the synthesized metal complexes. The spectral data show that the fluconazole served as a bidentate ligand and linked to metal ions via the nitrogen of the imine group, the thiocyanate ion connected to metal ions through nitrogen. The antibacterial capacities of the strains of Candida albicans (MTCC 183) for fungi and Escherichia coli (MTCC 732) for bacteria were assessed using the disc diffusion method. The results showed that Zn (II) and Hg (II) complexes have much stronger antibacterial activity than pure ligands because of metal chelation. The complexes interactions with the stable free radical DPPH are measured. The free radical scavenging activities of the complexes and the ligand have been determined by measuring their interaction with the stable free radical DPPH. The complexes have larger antioxidant activity as compared to the ligands.

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Browne, Julian M. W., Jan Wikaira, Christopher M. Fitchett et Richard M. Hartshorn. « Polydentate ligand construction : intramolecular condensation reactions in the synthesis of imine-containing ligands ». Journal of the Chemical Society, Dalton Transactions, n^o 10 (2002) : 2227. http://dx.doi.org/10.1039/b111556a.

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Lu, Yongqiu, et Xiaofang Li. « Study on synthesis and characterization of a novel pyridine imide ligated rare earth metal complex C₂₈H₅₁N₂Ln (THF)_n(CH₂ SiMe₃)₃ (Ln = Sc, Y) and its catalytic performance in polymerization of isoprene ». Journal of Physics : Conference Series 2713, n^o 1 (1 février 2024) : 012029. http://dx.doi.org/10.1088/1742-6596/2713/1/012029.

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Abstract We simply synthesized the pyridine imine rare earth trialkyl Figures (2, 3) by using the isofold scandium trialkyl complex Sc3(THF)2.5(CH2SiMe3) and the Yttrium trialkyl complex Y(THF)2.5(CH2SiMe3)3 with the pyridine imine derivative ligand (1: C28H51N2Sc (THF) (CH2SiMe3)3; 2: C28H51N2Y(THF)0.625(CH2SiMe3)3. In situ, nuclear magnetic resonance (NMR) showed that for pyridine imine rare earth trialkyl Figures (2, 3), different feed ratios of borate [Ph3C] [B(C6F5)4] to catalyst and different feed sequences of borate and alkyl aluminum can produce different catalytic active species. These catalytic active species can realize high activity (4.08 × 104g·molSc −1·h−1), high selectivity, and narrow molecular weight distribution (1.4) polymerization of conjugated diene such as isoprene.

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Denker, Lars, Bartosz Trzaskowski et René Frank. « Correction : “Give me five” – an amino imidazoline-2-imine ligand stabilises the first neutral five-membered cyclic triel(i) carbenoids ». Chemical Communications 57, n^o 31 (2021) : 3824. http://dx.doi.org/10.1039/d1cc90120f.

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Correction for ‘“Give me five” – an amino imidazoline-2-imine ligand stabilises the first neutral five-membered cyclic triel(i) carbenoides’ by Lars Denker et al., Chem. Commun., 2021, 57, 2816–2819, DOI: 10.1039/D1CC00010A.

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