Synthesis and Structural Studies of Co(II), Ni(II), Cu(II), Zn(II) and Cd(II) Chelates Derived From Semicarbazide and Thiosemicarbazide Derivatives

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Abstract
The synthesis and characterization of cobalt(II), nickel(II), copper(II), zinc(II) and cadmium(II) chelates containing 1-anthranyl-4-phenyl-3-semicarbazide (APSC) and/or 1-anthranyl-4-phenyl-3-thiosemicarbazide (APTSC) are reported. The chelates have been characterized on the basis of elemental analyses, spectra (NMR, IR, visible), magnetic moments, conductivities and molecular weight measurements. The values of molar conductivities in DMP or DMSO indicate the non-ionic nature of all metal chelates. A tetrahedral structure is proposed for the Ni(II) chelates, square-planar for the Cu(II) chelates and tetrahedral or octahedral for the Co(II) chelates according to the data of magnetic measurements and electronic spectra. The ligands (APSC, APTSC) behave in a bidentate manner toward the metal ions, but with different coordination sites. 1HNMR spectra of the ligands and the diamagnetic chelates are discussed. The chelates have a monomeric or a polymeric nature.