Synthesis and characterization of [Me2NC(S)NP(S)(OiPr)2]- complexes of Co(II), Ni(II), Zn(II) and Cd(II)

Reaction of the Potassium salt of N-thiophosphorylthiourea Me2NC(S)NHP(S)(OiPr)(2) (HL) with Co(II), Ni(II), Zn(II) and Cd(II) cations in aqueous EtOH leads to M(L-S,S')(2) (ML2) chelate complexes. The structures of the resulting Compounds were studied by IR, UV-Vis, H-1, P-31{H-1} NMR spectroscopy and microanalysis. The metal center is found in a tetrahedral environment in complexes CoL2, ZnL2, CdL2 and square-planar in NiL2 formed by the C=S and P=S sulfur atoms of two deprotonated ligands L. According to the NMR and UV-Vis spectroscopy data it was established that the metal cation of NiL2 is in a square-planar environment in CH2Cl2, CHCl3 and C6H6, whereas NiL2 shows features of tetrahedral or octahedral complexes in acetone, DMSO and DMF Molecular structures of complexes were elucidated by single crystal X-ray diffraction analysis. (C) 2009 Elsevier Ltd. All rights reserved.