Metal complexes of P(Ph 2)CH 2(Ph 2)PSe. Crystal structure of [Ni{P(Ph 2)CH 2(Ph 2)PSe} 2]Cl 2·2EtOH

Abstract

The reactions of P(Ph 2)CH 2(Ph 2)PSe (dppmSe) with MCl 2 species (M = Ni, Co or Pd) and with [{M′(COD)Cl} 2] complexes (M′ = Rh or Ir) afford mononuclear cationic complexes of the type [M(dppmSe- P,Se) 2]Cl 2 and [M′(COD)(dppmSe- P,Se) 2]Cl. The crystal structure of the nickel derivative has been solved by X-ray diffraction methods. It consists of square planar complex cations, chloride ions and ethanol molecules held together by a network of hydrogen bonds involving also carbon atoms. The chelating behaviour of dppmSe ligand in the Rh and Ir complexes is indicated by 31P and 77Se NMR data. In the case of CuCl 2 a redox process takes place yielding [Cu(dppmSe)Cl], which undergoes air oxidation to give [Cu II{Cu ICl 2[μ-SeC(Ph 2PO) 2]} 2].