Relevant bibliographies by topics / Fe-Co square complexes

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  2. Dissertations / Theses
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Academic literature on the topic 'Fe-Co square complexes'

Author: Grafiati
Published: 6 September 2023

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Journal articles on the topic "Fe-Co square complexes"

1

Balouch, Aamna, Najma Memon, Muhammad I. Bhanger, and Muhammad Y. Khuhawar. "Utilization of Picolinaldehyde-4-phenyl-3-thiosemicarbazone in Sodium Dodecylsulfate Micelles for the Spectrophotometric Determination of Iron, Vanadium, and Cobalt Following Partial Least-Squares Regression Analysis." Journal of AOAC INTERNATIONAL 92, no. 1 (January 1, 2009): 248–56. http://dx.doi.org/10.1093/jaoac/92.1.248.

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Abstract Partial least-squares regression was applied for the simultaneous determination of iron, vanadium, and cobalt after complexation with picolinaldehyde-4-phenyl-3-thiosemicarbazone (PAPT) in the presence of anionic sodium dodecylsulfate (SDS) micelles. These 3 complexed metal ions exhibited overlapping spectra in the 390510 nm region with a maximum absorbance at 415 nm at pH 3.0 and enhanced absorbance in the presence of SDS. The data for the simultaneous determination of these metal ions were analyzed using a simple partial least-squares (SIMPLS) algorithm. Formation constants (log Kf) were found to be 4.65, 3.29, and 4.85 for PAPT complexes of Fe, V, and Co, respectively, and the detection limits for Fe, V, and Co were 0.013, 0.002, and 0.010 g/mL, respectively. Common anions and cations did not interfere with the proposed method. The method was validated by calculating root mean square error of cross-validation, root mean square error of calibration, and root mean square error of prediction and was applied to determine these 3 metal ions in real crude oil samples.
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2

Pascualini, M. E., S. A. Stoian, A. Ozarowski, N. V. Di Russo, A. E. Thuijs, K. A. Abboud, G. Christou, and A. S. Veige. "Synthesis and characterization of a family of M2+ complexes supported by a trianionic ONO3− pincer-type ligand: towards the stabilization of high-spin square-planar complexes." Dalton Transactions 44, no. 46 (2015): 20207–15. http://dx.doi.org/10.1039/c5dt03960f.

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3

Journal, Baghdad Science. "Synthesis of Some Mixed ligands Complexes of (2-hydroxy benzaldine)-4-amino Antipyrine and 1,10-phenanthroline and Studying their antibacterial activity." Baghdad Science Journal 14, no. 1 (March 5, 2017): 39–47. http://dx.doi.org/10.21123/bsj.14.1.39-47.

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Complexes from the ligand (2-hydroxy benzaldine)-4-aminoantipyrine with some transition metal ions V(l?),Cr(lll),Fe(lll) and Co(ll) were prepared in the presence of the co-ligand 1,10-phenanthroline in alcoholic medium. These compounds were characterized by the available techniques: FT-IR ,UV-Visible ,magnetic susceptibility, Flame atomic absorption technique as well as elemental analysis and conductivity mesurments .From these spectral studies, a square pyramidal structure proposed for V(IV) complex and an octahedral geometry for Cr(III),Fe(III) and Co(II) complexes. The biological activity of the ligands and their complexes were evaluated by a gar plate diffusion technique against three human pathogenic bacterial strains: Pseudomonas aerogenuosa, E.schriachia coli. and Staphlococcus arureus. Some of the complexes were found to have a good antibacterial activity a gainst these pathogens.
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4

Neelamma, M., P. Venkateswar Rao, and G. H. Anuradha. "Synthesis and Structural Studies on Transition Metal Complexes Derived from 4-Hydroxy-4-methyl–2-pentanone-1H-benzimidazol-2-yl-hydrazone." E-Journal of Chemistry 8, no. 1 (2011): 29–36. http://dx.doi.org/10.1155/2011/323404.

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Transition metal complexes of Cr(III), Fe(III), Mn(II), Co(II), Ni(II), Cu(II) and Zn(II) with a tridentate ligand, 4-hydroxy-4-methyl-2-pentanone-1H-benzimidazole-2yl-hydrazone (H-HPBH) derived from the condensation of 2-hydrazinobenzimidazole and diacetone alcohol was synthesized. Characterization has been done on the basis of analytical, conductance, thermal and magnetic data, infrared,1H NMR, electronic, mass and ESR spectral data. From analytical and thermal data, the stoichiometry of the complexes has been found to be 1:1 (metal: ligand). Divalent complexes have the general formula [M(HPBH)Cl(H2O)2] in octahedral geometry, [M(HPBH)Cl] in tetrahedral and square planar stereochemistries and trivalent complexes [M(HPBH)Cl2(H2O)] in octahedral disposition. Infrared spectral data suggest that the ligand HPBH behaves as a monobasic tridentate ligand with N: N: O donor sequence towards the metal ions. On the basis of the above physicochemical data, octahedral, tetrahedral and square planar geometries were assigned for the complexes. The ligand and metal complexes were screened for their physiological activities againstE. coliandS. aureus. The order of physiological activity has been found to be Cu(II) > Ni(II) > Zn(II) > Co(II) > Cr(III) > Mn(II) > Fe (III) > ligand againstE.coliand Ni(II) > Cu(II) > Zn(II) > Mn(II) > Cr(III) > Fe(III) > Co(II) > ligand againstS. aureus.
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Munde, Achut, Amarnath Jagdale, Sarika Jadhav, and Trimbak Chondhekar. "Synthesis, characterization and thermal study of some transition metal complexes of an asymmetrical tetradentate Schiff base ligand." Journal of the Serbian Chemical Society 75, no. 3 (2010): 349–59. http://dx.doi.org/10.2298/jsc090408009m.

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Complexes of Cu(II), Ni(II), Co(II), Mn(II) and Fe(II) with an asymmetric tetradentate Schiff base ligand derived from dehydroacetic acid, 4-methyl- o-phenylenediamine and salicylic aldehyde were synthesized and characterized by elemental analysis, conductometry, magnetic susceptibility, UV-Vis, IR, 1H-NMR spectroscopy, X-ray diffraction analysis of powdered samples and thermal analysis, and screened for antimicrobial activity. The IR spectral data suggested that the ligand behaves as a dibasic tetadentate ligand towards the central metal ion with an ONNO donor atoms sequence. From the microanalytical data, the stoichiometry of the complexes 1:1 (metal:ligand) was found. The physico-chemical data suggested square planar geometry for the Cu(II) and Ni(II) complexes and octahedral geometry for the Co(II), Mn(II) and Fe(II) complexes. The thermal behaviour (TGA/DTA) of the complexes was studied and kinetic parameters were determined by Horowitz-Metzger and Coats-Redfern methods. The powder X-ray diffraction data suggested a monoclinic crystal system for the Co(II), Mn(II) and Fe(II) complexes. The ligand and their metal complexes were screened for antibacterial activity against Staphylococcus aureus and Escherichia coli and fungicidal activity against Aspergillus niger and Trichoderma viride.
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Holland, Amanda M., Allen G. Oliver, and Vlad M. Iluc. "Iron pyrrole-based PNP pincer ligand complexes as catalyst precursors." Acta Crystallographica Section C Structural Chemistry 73, no. 7 (June 28, 2017): 569–74. http://dx.doi.org/10.1107/s2053229617009287.

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The structure of a pincer ligand consists of a backbone and two `arms' which typically contain a P or N atom. They are tridentate ligands that coordinate to a metal center in a meridional configuration. A series of three iron complexes containing the pyrrole-based PNP pincer ligand 2,5-bis[(diisopropylphosphanyl)methyl]pyrrolide (PNpyrP) has been synthesized. These complexes are possible precursors to new iron catalysts. {2,5-Bis[(diisopropylphosphanyl)methyl]pyrrolido-κ3 P,N,P′}carbonylchlorido(trimethylphosphane-κP)iron(II), [Fe(C18H34NP2)Cl(C3H9P)(CO)] or [Fe(PNpyrP)Cl(PMe3)(CO)], (I), has a slightly distorted octahedral geometry, with the Cl and CO ligands occupying the apical positions. {2,5-Bis[(diisopropylphosphanyl)methyl]pyrrolido-κ3 P,N,P′}chlorido(pyridine-κN)iron(II), [Fe(C18H34NP2)Cl(C5H5N)] or [Fe(PNpyrP)Cl(py)] (py is pyridine), (II), is a five-coordinate square-pyramidal complex, with the pyridine ligand in the apical position. {2,5-Bis[(diisopropylphosphanyl)methyl]pyrrolido-κ3 P,N,P′}dicarbonylchloridoiron(II), [Fe(C18H34NP2)Cl(CO)2] or [Fe(PNpyrP)Cl(CO)2], (III), is structurally similar to (I), but with the PMe3 ligand replaced by a second carbonyl ligand from the reaction of (II) with CO. The two carbonyl ligands are in a cis configuration, and there is positional disorder of the chloride and trans carbonyl ligands.
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Journal, Baghdad Science. "Synthesis, Structural Studies of Some New Transition Metals Complexes of Semicarbazide hydro chloride Schiff Base Derivatives." Baghdad Science Journal 10, no. 3 (September 1, 2013): 583–96. http://dx.doi.org/10.21123/bsj.10.3.583-596.

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A new series of transition metal complexes of Cu(II), Ni(II), Co(II) and Fe(III) have been synthesized from the Schiff base (L1) and (L2) derived from Semicarbazide hydro chloride and 4-chlorobenzaldehyde or 4-bromobenzaldehyde. The structural features have been arrived from their elemental analyses, magnetic susceptibility, molar conductivity, IR, UV-Vis. and 1H NMR spectral studies. The data show that the complexes have composition of [M(L)2](NO3)2 and [Fe(L)2 (NO3)2](NO3) where the M=Co(II),Ni(II) and Cu(II) ;L=L1and L2 type. The magnetic susceptibility and UV-Vis spectral data of the complexes suggest a square planer geometry for Co(II) and Cu(II) but Fe(III) octahedral geometry and Ni(II) tetrahedral geometry around the central metal ion.Hyper Chem-6 program has been used to predict structure geometries of compounds in gas phase .The electrostatic potential of the free ligands were calculated to investigate the reactive sites of the molecules .The heat of formation(?Hf ?) and binding energy(?Eb) at 298K for the free ligands and its metal complexes were calculated by using PM3 method.
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Perez-Gavilan, Ariane, Patrick J. Carroll, and Larry G. Sneddon. "Syntheses and structural characterizations ofcloso and nido 10-vertex metallatricarbanonaboranes." Collection of Czechoslovak Chemical Communications 75, no. 9 (2010): 905–17. http://dx.doi.org/10.1135/cccc2010055.

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Deboronation of the 11-vertex metallatricarbadecaboranes 1-(η5-C5H5)-2-Ph-closo-1,2,3,4-M-C3B7H9 [M = Ru, Fe] and 1,1,1-(CO)3-2-Ph-closo-1,2,3,4-M-C3B7H9 [M = Re] with tetrabutylammonium fluoride (TBAF) produced the first examples of the 10-vertex families of closo and nido metallatricarbanonaborane complexes, 2-(η5-C5H5)-10-Ph-closo-2,1,6,10-M-C3B6H8 [M = Ru (1), Fe (2)] and 5,5,5-(CO)3-10-Ph-nido-5,6,9,10-Re-C3B6H9– (3). Crystallographic characterizations of 1 and 3 confirmed geometries, based on a bicapped square antiprism for 1 and a bicapped square antiprism with one missing vertex for 3, that are consistent with their respective 22 (closo) and 24 (nido) skeletal-electron counts.
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9

Yadav, M., and Debasis Behera. "Synthesis, Characterization, and Biological Activity of Mn(II), Fe(II), Co(II), Ni(II), Cu(II), Zn(II), and Cd(II) Complexes of N-Thiophenoyl-N′-Phenylthiocarbohydrazide." Journal of Chemistry 2013 (2013): 1–8. http://dx.doi.org/10.1155/2013/721397.

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Mn(II), Fe(II), Co(II), Ni(II), Cu(II), Zn(II), and Cd(II) complex of N-thiophenoyl -N′-phenylthiocarbohydrazide (H2TPTH) have been synthesized and characterized by elemental analysis, magnetic susceptibility measurements, infrared, NMR, electronic, and ESR spectral studies. The complexes were found to have compositions [Mn(H TPTH)2], [Co(TPTH) (H2O)2], [Ni(TPTH) (H2O)2], [Cu(TPTH)], [Zn(H TPTH)], [Cd(H TPTH)2], and [Fe(H TPTH)2(EtOH)]. The magnetic and electronic spectral studies suggest square planar geometry for [Cu(TPTH)], tetrahedral geometry for [Zn(TPTH)] and [Cd(H TPTH)2], and octahedral geometry for rest of the complexes. The infrared spectral studies of the 1 : 1 deprotonated complexes suggest bonding through enolic oxygen, thiolato sulfur, and both the hydrazinic nitrogens. Thus, H2TPTH acts as a binegative tetradentate ligand. H2TPTH and its metal complexes have been screened against several bacteria and fungi.
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Santoro, Amedeo, Carlo Sambiagio, Patrick C. McGowan, and Malcolm A. Halcrow. "Synthesis and coordination chemistry of 1,1,1-tris-(pyrid-2-yl)ethane." Dalton Transactions 44, no. 3 (2015): 1060–69. http://dx.doi.org/10.1039/c4dt02824d.

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The complexes [ML2]n+(Mn+= Fe2+, Co2+, Co3+, Cu2+and Ag+), [PdCl2L] and [CuI(L)] are described. [AgL2]+is an unusual square planar silver(i) centre (left). Exposure of [CuI(L)] to air affords mono- or dinuclear copper(ii)/carbonato products. Two of the copper complexes form crystalline hydrates with complicated hydrogen bond networks (right).
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Dissertations / Theses on the topic "Fe-Co square complexes"

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Kamilya, Sujit. "Photo magnetic Investigation and Magneto-structural Correlation of Switchable Molecular Magnetic Materials." Thesis, 2023. https://etd.iisc.ac.in/handle/2005/6176.

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Modern life without magnetic materials is almost impossible to imagine. Mobile phones, telecommunication, navigation, computer, television, credit cards, medical equipment, data storage devices, and sensors are an integral part of modern life. The demand and supply ratio of data storage devices is increasing day by day. To mitigate this, tremendous effort is required toward the synthesis and development of high-density data storage devices. Molecular systems exhibiting bistability i.e., a controlled and reversible change in their physical properties by external stimuli have a tremendous possibility in molecular-scale electronics e.g., data storage device, molecular qubits, quantum technology, molecular spintronics, and nanotechnological application. In particular, molecular magnetism is a rapidly growing field where molecules exhibiting photo- and thermo-chromism are of potential interest. In this thesis, I have adopted a unique ‘complex as a ligand’ strategy to rationally design and synthesize switchable molecular magnetic materials which exhibit interesting physical properties such as single-molecule magnet (SMM), spin crossover (SCO), metal-tometal electron transfer (MMET) and electrical and thermal conductivity. A series of new multifunctional homo-/hetero-bimetallic [Fe2Co2], [Fe2Fe2], and [Fe2Mn2] complexes have been synthesized using a molecular approach. To understand better the contributing factors for MMET properties, for example, ligand field effect, cooperativity, crystal matrix, and electronic factors, we have performed detailed structural, magnetic, optical, spectroscopic, and other physical characterization. Interestingly, some of these systems show interesting on/off photo-switching and thermo- and photo-induced hysteresis effects. I have performed a detailed study of the photo-induced metastable state along with the high-temperature magneto-structural investigation. In other parts of my thesis, I have studied the singlemolecule magnet behavior in highly anisotropic Co(II) complexes and the spin state switching behavior in Co(II) mono- and polymeric systems. In the last part of my thesis, I have coupled both spin crossover and luminescence properties in a coordination polymer in which concomitant change in both spin state and luminescence has been observed. Finally, I have discussed the application of these switchable materials in optoelectronic devices.
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Book chapters on the topic "Fe-Co square complexes"

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Welberry, T. R. "Automatic refinement of a Monte Carlo model." In Diffuse X-ray Scattering and Models of Disorder, 174–91. Oxford University Press, 2022. http://dx.doi.org/10.1093/oso/9780198862482.003.0014.

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Although, in earlier chapters, convincing results were obtained using MC simulation for a variety of quite different systems, the crucial step of comparing the observed and calculated patterns was performed visually and decisions regarding the adjustment of the model parameters relied heavily on the experience of the investigator. In this chapter an automatic least-squares refinement of a Monte Carlo model is demonstrated in which quantitative comparison of observed and calculated patters are made and model parameters updated automatically. The differentials used to form the least-squares matrix are obtained numerically from the difference of two complete MC simulations for each parameter, making the process very computer intensive but quite feasible using parallel processing. The example used for the study was an iron carbonyl, Fe3(CO)12.
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Conference papers on the topic "Fe-Co square complexes"

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Farias, Mathew, Han Hu, Shanshan Zhang, Jianzhi Li, and Ben Xu. "Molecular Dynamic Simulation of Diffusion in the Melt Pool in Laser Additive Alloying Process of Co-Ni-Cr-Mn-Fe High Entropy Alloy." In ASME 2021 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2021. http://dx.doi.org/10.1115/imece2021-72075.

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Abstract High entropy alloys (HEAs) can be manufactured in many conventional ways, but it becomes difficult of fabricating heterogeneous materials and structures. Selective Laser Melting (SLM) method generally melts pure elemental powders or prefabricated alloy powders without alloying process. In-situ alloying in SLM, which is also called Laser Additive Alloying (LAA), using pure elemental powders becomes a promising method for creating HEA with heterogeneous structures. However, the effect of the diffusion of elements in the molten pool on the formation of HEA remains unclear. In this paper, the well-discussed Cantor HEA was studied in an in-situ alloying situation, where pure elemental powders (Co, Cr, Mn, Ni, Fe) distributed on a powder bed were irradiated by laser and were subsequently allowed to cool back to room temperature. The diffusion of specific elements, with respect to their original clusters, was tracked via Mean Square Displacement (MSD) as well as the final composition of key locations. Our model was verified by showing a good agreement with the overall average diffusion rates of each element in the Cantor HEA qualitatively in other works from literature. Results initially showed that as the energy density increases, better diffusion was observed through a pixel overlay analysis about the mixing of different elements. The best-case scenario of diffusion from the pixel overlay map indicated a strong presence of 3 to 4 elements after the laser scanning. Given the conditions in the MD simulation, there was no apparent segregation of elements during the alloying process. In addition, we also conducted a simulation by implementing a 0.03 nm/ps laser scanning in a meander 2-track scan in order to completely melt the powder bed. After cooling and equilibration, Polyhedral Template Analysis was applied to analyze the crystal structure of the solidified powder bed in the presence of increasing components. When the powders of Cantor HEA were alloyed using LAA approach, all elements experienced a complex diffusion behavior, elements like Cr also experienced a relatively rapid diffusion compared to other elements. Despite this, Cr only diffused for a short period and diffused minimally during the in-situ alloying process. The analysis of element-specific behavior, such as diffusion, can provide a framework for the LAA production of HEA. This MD study provides a detailed analysis about the effect of diffusion on the formation of HEA system if in-situ alloying is adopted, the findings of this study can be used to guide the material design and the appropriate parameters for manufacturing process of new HEAs. This study can also be extended to analyze the effect of diffusion on the thermomechanical properties of HEAs.
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