Synthesis and Characterization of Co(Ii), Ni(Ii), Cu(Ii), and Zn(Ii) Complexes of Thiosemicarbazones

Cobalt (II), nickel (II) copper (II) and zinc(II) complexes of Schiff bases [HL1-2] derived from 2,5-dichlorosalisaldehyde/2,5- dibromosalisaldehyde and 4-methyl-3-semicarbazide were synthesized. The structure of all the compounds have been evaluated on the basis of elemental analysis, molar conductance measurements and spectroscopic studies like Fourier-Transform Infrared (FTIR) spectroscopy, Ultraviolet-Visible (UV-Vis) spectroscopy, Nuclear Magnetic Resonance (NMR) spectroscopy, Erythrocyte Sedimentation Rate (ESR) and mass spectroscopy. The Schiff base ligands existed as NOS donor coordinating to metal ion through Azomethine nitrogen, sulphur of thiosemicarbazide and oxygen of deprotonated phenolic group forming complexes of the type [M(L1-2)2] in 1: 2 molar ratio. The spectroscopic data and physical measurement techniques suggested octahedral geometry around metal centers.