Platinum group metal complexes of tris(2-(diphenylphosphino)ethyl)amine

Abstract

A mixed donor potential tetradentate ligand tris(2-(diphenylphosphino) ethyl)amine (TPEA) was synthesised by a modified procedure and characterized by ¹H, ¹³C and ³¹P NMR spectral data. Ru(II) complexes of TPEA were prepared by its interaction with RuCl₂(PPh₃)₃ and RuCl₂(DMSO)₄ to give [RuCl₂(TPEA)] and RuCl₂ (DMSO)(TPEA) respectively. Ru(III) complexes of the composition RuX₃(TPEA) or [RuX₂(AsPh₃)(TPEA)]X were obtained by the reaction of TPEA with RuX₃(AsPh₃)₂·MeOH (X=Cl⁻, Br⁻). A neutral Rh(I) complex of the composition RhCl(TPEA) was obtained by the reaction of [RhCl(COD)]₂ with TPEA. Cationic metal carbonyl complexes of the type [M(CO)(TPEA)]Cl (M=Rh, Ir) were obtained by the interaction of [M(CO)Cl(PPh₃)₂] with TPEA. The reaction of hydrated RhCl₃ with TPEA gave [RhCl₂(TPEA)]Cl in methanol. A five coordinated cationic complex [PdCl(TPEA)]Cl was obtained by the reaction of PdCl₄²⁻ with TPEA. Interaction of PtCl₂(COD) with TPEA however gave the square planar complex [PtCl(TPEA)]Cl. All the complexes were characterized by physico-chemical and spectroscopic methods.