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Abstract
New metal complexes of the types[Cu2(H2L)X2·2H2O]·2H2O, X = Cl or Br, [Co(HL)2·2H2O] and [M2L2·2H2O]·nH2O (M = Ni(II), Zn(II) and Cd(II); n = 0–2, PHT = H2L = 4-phenyl-1-hippuroyl-3-thiosemicarbazide have been synthesized and characterized employing elemental analysis, molar conductance, magnetic moment, electronic and IR spectral studies. The different modes of chelation and the stereochemistry of the complexes are investigated. The ligand behaves as a reducing agent towards Cu(II) and Fe(III) salts forming Cu(I) and Fe(II) complexes, respectively. Square-planar and low spin octahedral structures have been proposed for Ni(II) and Co(II) complexes.