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, 1H, 31P{1H} 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 CS and PS 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.

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 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. 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.Figure optionsDownload as PowerPoint slide