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

Abstract The reaction of the potassium salts of N -(thio)phosphorylated thioureas of the common formula AdN(H)C(S)N(H)P(X)(O i Pr) 2 (X = O, HL I ; X = S, HL II ) with the Ni(II) cation in aqueous EtOH leads to [ Ni ( L I , II ) 2 ] chelate complexes. The molecular structures of the thioureas HL I , II and the complexes [ Ni ( L I - N , S ) 2 ] and [ Ni ( L II - S , S ′) 2 ] were elucidated by single crystal X-ray diffraction analysis, IR, 1 H and 31 P NMR spectroscopy and microanalysis. In the complex [ Ni ( L I ) 2 ], the metal center is found to be in a square-planar N 2 S 2 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.