Coordination Mode of the Nickel(II) Cation with <i>N</i>‐Diisopropoxyphosphinyl‐<i>p</i>‐bromothiobenzamide

Abstract

Abstract Reaction of the potassium salt of N ‐diisopropoxyphosphinyl‐ p ‐bromothiobenzamide p ‐BrC 6 H 4 C(S)NHP(O)(O i Pr) 2 ( HL ) with Ni(NO 3 ) 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, 1 H and 31 P{ 1 H} NMR spectroscopy, MALDI and microanalysis. The nickel(II) ion in 1 has a tetragonal‐bipyramidal environment, (O ax ) 2 (O eq ) 2 (S eq ) 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.