Preparation and properties of nickel(II) and palladium(II) complexes of 2,2′-biphenylylenebisdiethylphosphine. Spectroscopic, magnetic, and proton magnetic resonance studies

Abstract

The 1 : 1 complexes of the chelating diphosphine, 2,2′-biphenylylenebisdiethylphosphine, with nickel(II) halides and thiocyanate and with palladium(II) bromide have been prepared, and their magnetic properties and electronic and n.m.r. spectra studied.

The nickel(II) chloride and bromide complexes in solution exhibit square planar-tetrahedral isomerism, while the corresponding iodide and thiocyanate complexes remain exclusively tetrahedral and square-planar respectively. The palladium(II) bromide complex has the square-planar configuration.

A brief study has been made of the chelating properties of the analogous diarsine. This gives a stable 1 : 1 complex with palladium(II) bromide but does not apparently give 1 : 1 nickel(II) halide complexes.