Nickel(II) complexes with N-(thio)phosphorylthioureas AdNHC(S)NHP(X)(OiPr)2:: Versatile coordination of phosphoryl (X = O) and thiophosphoryl (X = S) derivatives

The reaction of the potassium salts of N-(thio)phosphorylated thioureas of the common formula AdN(H)C(S)N(H)P(X)(OiPr)(2) (X=O, HLI; X=S, HLII) with the Ni(II) cation in aqueous EtOH leads to [Ni(L-I,L-II)(2)] chelate complexes. The molecular structures of the thioureas HLI,II and the complexes [Ni(L'N,S)2] and [Ni(L-II-S,S')(2)] were elucidated by single crystal X-ray diffraction analysis, IR, H-1 and P-31 NMR spectroscopy and microanalysis. In the complex [Ni(L-I)(2)], the metal center is found to be in a square-planar N2S2 environment formed by the C=S sulfur atoms and the P-N nitrogen atoms of two deprotonated L-I ligands. The ligands are in a trans configuration. The Ni(II) atom in complex [Ni(L-II)(2)], with the deprotonated thiourea L-II, is coordinated in a square-planar fashion by the C=S and P=S sulfur atoms of two anionic ligands. The ligands are in a cis configuration. (C) 2008 Elsevier Ltd. All rights reserved.