Coordination mode of the nickel(II) cation with N-diisopropoxyphosphinyl-p- bromothiobenzamide

Reaction of the potassium salt of N-diisopropoxyphosphinyl-p- bromothiobenzamide p-BrC6H4C(S)NHP(O)(OiPr)2 (HL) with Ni(NO3)2 in aqueous EtOH leads to complex of formula [Ni(HL-O)2(L-O,S)2] (1). The structure of 1 was investigated by single crystal X-ray diffraction analysis, IR, 1H and 31P{1H} NMR spectroscopy, MALDI and microanalysis. The nickel(II) ion in 1 has a tetragonal-bipyramidal environment, (O ax)2(Oeq)2(Seq) 2, with two neutral ligand molecules coordinated in axial positions through the oxygen atoms of the P=O groups. The equatorial plane of bipyramide is formed by two anionic ligands involving 1,5-O,S-coordination mode. The chelating ligands are bound in trans configuration. © 2008 Wiley-VCH Verlag GmbH & Co. KGaA