SYNTHESIS AND SPECTROSCOPIC STUDY OF Cu(II), Ni(II), AND Co(II) COMPLEXES OF THE LIGAND SALICYLIDENE-2-AMINO THIOPHENOL

The FTIR and Raman spectra of the ligand salicylidene-2-amino thiophenol (SATP) in the wave number range 4000–200 cm−1 are measured and assigned in terms of a Cs symmetry. The results indicate that SATP exhibits a zwitter ion structure of trans configuration in the ground solid state formed via proton transfer from the thiol group (-SH) to the imine group (−CH=N−). SATP complexes with Cu(II), Ni(II) and Co(II) ions are also synthesized and their structure are determined by elemental analysis, conductometric measurements, thermogravimetric analysis (TGA), UV-Visible and FTIR spectra. The complexes are found to have the formula (ML·H2O) for Cu(II) and Ni(II) ions and (NH4)2 [(Co)2L(OH)4] for Co(II) ion.