SYNTHESES AND MOLECULAR STRUCTURES OF THE ASYMMETRICAL DIPHOSPHINE LIGANDS AND THEIR Pt, Ni ORGANOMETALLIC COMPLEXES

In this paper, we report a novel two-step synthetic method of the symmetrical and asymmetrical diphosphine ligands 1, 2-bis(ditertbutylphosphino)ethane and 1, 2-bis(phenyltertbutylphosphino) ethane, and simultaneously establish a novel synthetic method of diphosphine ligand 1, 4-bis(phosphinocyclopentyl)butane with larger chelate ring. The former was prepared from the reaction of 1, 2-bis(dichlorophosphino)ethane with Grignard reagent andalkyl lithium, respectively, the latter from the reaction of 1, 4-di-Grignard reagent with PCl_3. Furthermore, a series of organometallic complexes of Pt, Ni containing diphosphine chelate ligand were prepared from the reaction of (COD) PtCl_2 complex with diphosphine. These complexes are very stable. Among these complexes, the molecular structures of (d(t-Bu)pe)-PtCl_2, (dPCypb)PtCl_2 and ((n-Bu) (PCyp))_2PtCl_2 complexes have been determined by X-ray diffraction method indicating they are novel complexes. The influence of diphosphine ligand on the molecular structure of organotransition metal complexes is discussed.

In this paper, we report a novel two-step synthetic method of the symmetrical and asymmetrical diphosphine ligands 1, 2-bis（ditertbutylphosphino）ethane and 1, 2-bis（phenyltertbutylphosphino） ethane, and simultaneously establish a novel synthetic method of diphosphine ligand 1, 4-bis（phosphinocyclopentyl）butane with larger chelate ring. The former was prepared from the reaction of 1, 2-bis（dichlorophosphino）ethane with Grignard reagent andalkyl lithium, respectively, the latter from the reaction of 1, 4-di-Grignard reagent with PCl3. Furthermore, a series of organometallic complexes of Pt, Ni containing diphosphine chelate ligand were prepared from the reaction of （COD） PtCl2 complex with diphosphine. These complexes are very stable. Among these complexes, the molecular structures of （d（t-Bu）pe）-PtCl2, （dPCypb）PtCl2 and （（n-Bu） （PCyp））2PtCl2 complexes have been determined by X-ray diffraction method indicating they are novel complexes. The influence of diphosphine ligand on the molecular