Four- and five-co-ordinate nickel(II) complexes with cis-(2-diphenylarsinovinyl)diphenylphosphine and 9,10-bis(diphenylphosphino)phenanthrene

Abstract

The preparation and complexing properties of the new bidentate ligands cis-(2-diphenylarsinovinyl)diphenylphosphine, vasp, and 9,10-bis(diphenylphosphino)phenanthrene, dpph, are reported. Four-co-ordinate [NiL₂X₂](L = vasp or dpph; X = Cl, Br, I, or NCS) and [NiL₂](ClO₄)₂, and the square-pyramidal five-co-ordinate [Ni(vasp)₂X]Y (X = Cl, Br, I, or NCS; Y = ClO₄ or BPh₄) and [Ni(dpph)₂(NO₃)]BPh₄ were characterised by magnetic, spectral, and conductivity measurements. The effect of chelate backbone on the complexing properties and the stereochemical and spectrochemical properties of the complexes is discussed.