Mixed-Ligand Chelate Formation of Co(II), Ni(II), Cu(II) and Zn(II) Ions with Schiff Base as Main Ligand and Amino Acid as Co-Ligand (original) (raw)
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Green and Sustainable Chemistry, 2014
New mixed ligand chelates synthesized from di-and trivalent metal ions (Cr, Co, Ni, and Cu ions) and Schiff base (L 1) resulted from the condensation of 4-dimethylaminobenzaldehyde with 2-aminophenol as primary ligand, whereas 2-nitroaniline (L 2) represents the secondary ligand in a molar ratio of M:L 1 :L 2 [1:1:1]. The synthesized Schiff base and chelates have been characterized by using several tools, such as, elemental analysis, molar conductivity, magnetic moment measurements, infrared and electronic spectra. The mass spectra of the ligands and Ni(II) chelate were used to justify the process of modification, as well as, the electron paramagnetic resonance spectrum which was carried out for Cu(II) chelate all in order to elucidate the chemical and geometrical structure of the chelates. On the basis of the obtained data, the geometry of the products was proposed for all the chelates.
JOURNAL OF SCIENTIFIC RESEARCH
New series of coordination compounds of some transition metal ions [Zr(IV), Co(II), Cu(II)] of synthesized ligand (4-[2{5-[4-Nitrobenzylidene)-amino]-[1,3,4]thiadiazole-2yl}phenylimino)-methyl]-phenol. These new prepared metal complexes and Schiff base ligand were characterised by elemental microanalysis (CHNSO), FTIR, UV-Vis, 1 H-NMR, thermal analysis (TGA-DTA), magnetic susceptibility and molar conductance. Accordance to the obtained data all the prepared complexes were non-electrolytic. On the basis of the instrumental results, structures of metal complexes have been proposed. From the spectral data it is revealed that all prepared complexes exhibit 2:1 (ligand: metal) ratio. Thermal data shows degradation of these complexes.
2014
Novel mixed ligand Co(II), Ni(II), Cu(II) and Zn(II) complexes of Schiff base derived through the condensation of furfurylidene-4-aminoantipyrine and 2-aminobenzothiazole with 2-aminophenol have been synthesized and characterized by various analytical and spectral techniques. The spectral results suggests octahedral geometry for Co(II), Ni(II) and Zn(II) complexes. Distorted octahedral geometry has been assigned for Cu(II) complex. The low molar conductance values of the complexes support their neutral nature. The thermal stability of the complexes was determined using TG/DTA studies. The electrochemical behavior of the complexes was studied using cyclic voltammetry. The grain size of the complex was calculated by Scherrer formula using powder XRD. Surface morphology of the complexes was determined by SEM analysis.
Synthesis and Solution Complexation Studies of a New Schiff Base Ligand
Journal of Physical & Theoretical Chemistry, 2015
A new Schiff base ligand, 2,2'-{pyridine-2,6-diylbis[nitrilo(E)methylylidene]}bis(4 bromophenol), has been synthesized by reaction of the 2,6-diamino pyridine with 5-bromo salicylaldehyde at ethanol under refluxing. The structure of the synthesized compound resulted from the IR, 1HNMR, MS and UV spectroscopy and elemental analysis data. Formation Constant (kf) value of it’s complexes with Cu, Ni, Cd, Co and Hg has been determined Conductometrically. The formation constants of the resulting 1:1 complexes have been calculated from the computer fitting of the molar conductance mole ratio data at different temperatures. The stability of the complexes to vary in acetonitrile solvent was in the order of Cu > Cd > Co > Hg > Ni. The enthalpy and entropy changes of the complexation reactions have been evaluated from the temperature dependence of formation constants.
Science Journal of Chemistry, 2015
Transition metal complexes of Cu(II), Ni(II), Co(II) and Fe(III) Containing Bidentate Schiff base, derived from the condensation of salicyladehyde and 2-aminophenol were synthesized and characterized by IR, UV-Vis., and some physical measurements. IR spectral studies show the binding sites of the Schiff base ligand with the metal ion. Molar conductance data and magnetic susceptibility measurements give evidence for monomeric and electrolytic nature of the complexes. Structural studies showed that Cu(II), Ni(II) and Co(II) ion complexes are tetrahedral and Fe(III) ion complex is octahedral.
Egyptian Journal of Chemistry
A NEW tetra dentate Schiff base ligand has been synthesized from condensation of compound (1): [(4-((1-H-imidazol-2-yldiazenyl)-1,5-dimethyl-2-phenyl-1Hpyrazol-3(2H)-one)]with compound (2) thio semicarbazaide. The general formula of complexes are [M(L)]Cl 2 Where. M= Co(II) ,Ni (II)and Cu(II)Zn(II) are reported. The geometry structures of ligand and the complexes were determined through Fourier-transform infrared spectroscopy (FT-IR), Mass spectra, X-ray diffraction analysis, Ultra violet-Visible(UV-Vis), Proton nuclear magnetic resonance(1 H NMR) spectral studies, magnetic moment measurement, elemental analysis, and molar conductance. These studies revealed square planar geometries for Ni(II) and Co(II) and Cu(II)complexes, except the Zn(II) complex was a tetrahedral geometry around the central metal ion. Complex formation studies via molar ratio and continuous variation methods were consisted to those found in the solid complexes with a ratio of (M:L) as (1:1). Stability constant of complexes were calculated by spectrophotometric methods. Hyper Chem-8 program has been used to predict geometries structures of compounds in gas phase. The heat of formation (∆H f) and binding energy (∆E b) at 298 K for the metal complexes were calculated by PM 3 method. Biological activity studies of the ligand and their metal complexes against several organisms, bacteria Gram positive G(+ve)staphylococcus aureus and bacteria Gram negative G (-ve)Escherichia coli, klebsiella pneumonic, In addition to fungi like Aspergillus Niger, Rhizoclonia bataicola and Aspergillus flavus , are reported. Compounds exhibited the high activity on the growth of all types microorganisms in this study. This may be attributed to the impact of both the chelate effect of Schiff bases ligand and the role of the metal in these complexes.
Synthesis and Reactivity in Inorganic and Metal-organic Chemistry, 2003
Cu(II), Co(II), Ni(II) and Zn(II) metal complexes of a new heterocylic Schiff base derived from 1-amino-5-benzoyl-4-phenyl-1H-pyrimidine-2one with 3-hydroxy-salicylaldehyde have been synthesized and characterized on the basis of elemental analyses, electronic, IR and 1 H NMR spectra, molar conductivity measurements, magnetic moment measurements and thermogravimetric analyses (TGA). It has been found that the Schiff base behaves as a neutral bidentate (NO) or tridentate (ONO) ligand forming chelates with 1:2 (metal:ligand) stoichiometry and