Synthesis and characterization of copper(II), nickel(II) and cobalt(II) complexes with novel thiourea derivatives

A novel series of thiourea derivatives, namely, N,N-diphenyl-N-(4-phenyl-benzoyl)thiourea (HL¹), N,N-diphenyl-N-(4-chloro-benzoyl)thiourea (HL²) and N,N-di-n-propyl-N-(4-chloro-benzoyl)thiourea (HL³), and its metal complexes has been prepared and characterised by elemental analysis, i.r. spectroscopy, ¹H-n.m.r. spectroscopy, mass spectrometry and single crystal X-ray diffraction. The ligand coordinates to Ni^II, Cu^II and Co^II in a bidentate manner yielding essentially neutral complexes of the type cis-[ML₂]. N.m.r. spectra and single crystal X-ray diffraction analysis revealed the presence of a distorted tetrahedral coordination ML₂ complex.