Synthesis and spectroscopic study of Cu(II), Ni(II), and Co(II) complexes of the ligand salicylidene-2-amino thiophenol

Abstract

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.