A new concept for the structural design of valence tautomeric (VT) metal complexes involving the formation of stable adducts of a tetracoordinate transition metal complex with a suitable bidentate redox-active ligand has been computationally studied using the DFT B3LYP*/6-311++G(d,p) method. The calculations, performed on a series of adducts of Co(II) diketonates with o-benzoquinone and its mon...

The ways of binding optically active ligands, mainly of the amino acid type, to cross—linked polymers of styrene, acrylamide or glycidylmethacrylate are reviewed. When coordina— ted to transition metal ions, these polymers display a high discriminating ability in sorption of optical isomers of corn— pounds capable of forming mixed—ligand complexes. The kinetic performance of the ligand—exchangi...

the complexation reactions between methylthymol blue (mtb) and co2+, ni2+, cu2+, zn2+ and pb2+ ions have been studied in different water-methanol mixtures at ph 4.45 and 25 °c by a spectrophotometric technique. the stepwise stability constants of the resulting 1:1 and 2:1 (metal ion to ligand) complexes were determined from the absorbance-mole ratio data. it was found that the overall stability...

The mixed ligand complexes of the type [ML1L2]Cl2, where M=Mn(II), Fe(III),Co(II), Ni(II), Cu(II)L1=pyruvic acid semicarbazone (PYSC) L2= acetone semicarbazone (ACSC). These complexes have been synthesized by the reactions of metal chlorides with two different semicarbazone in 1:1:1 molar ratios. The resulting products have been characterized on the basis of elemental analysis, magnetic measure...

X-ray K-absorption spectroscopic studies have been carried out on copper (II) mixed-ligand complexes with glutamic acid and aspartic acid as the primary ligands, where as water, pyridine, imidazole and benz-imidazole have been used as secondary ligands. Chemical shifts obtained from the X-ray absorption data have indicated that the glutamic acid complexes are more ionic as compared to their cor...

The structure-property relationship study of a series of cationic Ir(III) complexes in the form of [Ir(C^N)2(dtBubpy)]PF6 [where dtBubpy = 4,4'-di-tert-butyl-2,2'-bipyridine and C^N = cyclometallating ligand bearing an electron-withdrawing group (EWG) at C4 of the phenyl substituent, i.e., -CF3 (1), -OCF3 (2), -SCF3 (3), -SO2CF3 (4)] has been investigated. The physical and optoelectronic proper...

The synthesis and characterization of mixed ligand complexes of Fe (III) with tartaric acid/succinic acid and heterocyclic amines. These complexes were characterized on the basis of elemental analysis, conductometric, magnetic measurements, UVvis, IR spectral studies. All the complexes were found electrolytic and paramagnetic in nature with high spin octahedral structure. The synthesized comple...

The complexation reactions between methylthymol blue (MTB) and Co2+, Ni2+, Cu2+, Zn2+ and Pb2+ ions have been studied in different water-methanol mixtures at pH 4.45 and 25 °C by a spectrophotometric technique. The stepwise stability constants of the resulting 1:1 and 2:1 (metal ion to ligand) complexes were determined from the absorban...

Some new coordination compounds of tin(IV) having general formula [SnBu2 (L)2 ] (where L = carbohydrazone ligand) have been synthesized by the reaction of dibutyltin oxide with carbohydrazone ligands with the ratio of 1:2 (metal- ligand) using dry benzene as a reaction medium. The newly synthesized complexes were characterized by elemental analysis, molecular weight determinations, conductivity...