Synthesis and Thermal Behaviour of Co(II),Ni(II)and Cu(II)Complexes of N,N-di-n-propyl-N'-(2-chlorobenzoyI)thiourea

摘要

The Co(II),Ni(II)and Cu(II)complexes of N,N-di-n-propyl-N'-(2-chlorobenzoyl)thiourea were synthesized and the thermal behaviour of all complexes was studied by differential thermal analysis and thermal gravimetry methods.A GC-MS combined system was used to identify the decomposition products.The pyrolytic end products were identified by X-ray powder diffraction method.Both nickel and copper complexes decomposed in three stages,but cobalt complex decomposed in two stages.End products of the decomposition reactions were identified as Ni3S2,Co4S3 and Cuu_(1.96)S.The decomposition of the complexes begins with breakage the longer metal-oxygen bond in chelate ring,since these complexes decompose at higher temperatures proportional to 1/metal-ligand bond length.