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The reaction between zinc(II) acetate dihydrate and ((1H-indol-3-yl)methylene)-N-methyl­hydrazinecarbothioamide (L) in methanol results in the formation of Zn(II) complex [Zn(C11H11N4S)2] (1). The complex is characterized by CHNS and various spectroscopic analyses. The structure of the complex is determined by the single crystal X-ray diffraction technique. XRD reveals that the Zn(II) complex crystalizes in the triclinic system with the P-1 space group and has a distorted tetrahedral geometry. Two ligand molecules are coordinated to the Zn(II) ion in the bidenatate monobasic (NS–) fashion.

A series of novel binuclear Pd(II) complexes of the type [(PPh3)2ClPd(L)PdCl] [where L = dianionic bridged ligands derived from 2-oxo-1,2-dihydroquinoline-3-carbaldehyde or its derivatives with o-aminophenol/o-aminothiophenol] have been reported. The new complexes have been characterized by elemental analysis, FT-IR, UV–Vis and NMR (1H and 31P) spectroscopic techniques. The coordination mode of the ligands and the geometry of the complexes were confirmed by single crystal X-ray crystallography of one of the complexes. The catalytic efficiency of one of the binuclear Pd(II) complexes was tested for N-arylation of imidazole.

Four new Ni(II) complexes of the general formula [Ni(PPh 3 )(L)] (L = dibasic tridentate ligand derived from 4-diethylamino-salicylaldehyde and thiosemicarbazide or 4-N-substituted thiosemicarbazide) have been reported. The new complexes have been synthesized and characterized by analytical and spectroscopic (IR, electronic, 1 H NMR and 31 P NMR) techniques. Molecular structure of one of the complexes has been determined by X-ray crystallography. The complex, [Ni(PPh 3 )(L4)] (H 2 L4 = thiosemicarbazone prepared from 4-diethylamino-salicylaldehyde and 4-phenylthiosemicarbazide) crystallized in monoclinic space group with two molecules per unit cell and has the dimensions of a = 13.232(6) A, b = 10.181(5) A, c = 13.574(7) A, α = 90°, β = 98.483(2)° and γ = 90°. Catalytic activity of the complexes has been explored for aryl–aryl coupling reaction.

Six different ruthenium(III) complexes of Schiff bases derived from 2-hydroxy-1-naphthaldehyde and o-aminophenol/o-aminothiophenol have been synthesized. The compounds with the general formula [RuX(EPh3)2(L)] (X = Cl or Br; E = P or As; L = bifunctional tridentate ONO/ONS donor Schiff base ligand) were characterized by infrared, electronic, electron paramagnetic resonance spectroscopy and elemental analyses. Spectroscopic investigation reveals coordination of Schiff base ligand through ONO/ONS donor atoms and octahedral geometry around ruthenium metal. Redox property of complexes has been examined by using cyclic voltammetry. The catalytic oxidation property of ruthenium(III) complexes were also investigated.

The synthesis and characterization of several hexa-coordinated ruthenium(III) complexes of the type [RuCl(PPh3)2(L)] (L = dibasic tridentate ligand derived by the condensation of salicylaldehyde/o-vanillin with o-aminophenol/o-aminothiophenol) are reported. IR, electronic, EPR spectral data and redox bahaviour of the complexes are discussed. An octahedral geometry has been tentatively proposed for all the complexes. The new complexes were found to be effective catalysts for the oxidation of benzyl alcohol and cyclohexanol to benzaldehyde and cyclohexanone respectively using N-methylmorpholine-N-oxide as a co-oxidant. Copyright © 2007 John Wiley & Sons, Ltd.

Ru/g-Al2O3 catalyzed the dehydrogenation of alcohols to carbonyl compounds without employing hydrogen acceptor. The catalyst was readily recovered from the reaction mixture and could be reused.

Photosensitive polyesters containing photoreactive chalcone moieties in the main chain were synthesized from 1,3-bis(4-hydroxyphenyl)propenone and 3-(4-hydroxy-3-methoxyphenyl)-1- (4-hydroxyphenyl)propenone with adipoylchloride by an interfacial polycondensation technique. Fundamental studies on the two phase polycondensation using various phase transfer catalysts (quarternary ammonium salts) were done. The synthesized polymers were characterized by intrinsic viscosity, UV,IR, 1H-NMR and C,H-analysis. These polymers were studied for their thermal stability and photochemical properties. Thermal properties were evaluated by thermogravimetric analysis and differential scanning calorimetry. The photosensitivity of the polymer was investigated by UV spectrophotometry.