Halogen Exchange in Platinum−Phosphine−Tin(II) Halide Systems. Characterization of the Novel PtI(SnCl₃)[(2S,4S)-2,4-bis(diphenylphosphino)pentane] Complex

The investigation of the PtCl₂(diphosphine) + SnI₂ and PtI₂(diphosphine) + SnCl₂ systems of catalytic importance (where diphosphines are 2,3-bis(diphenylphosphino)butane and 2,4-bis(diphenylphosphino)pentane) by NMR in solution has been carried out. Novel PtI(SnCl₃)(diphosphine) and PtI(SnCl₂I)(diphosphine) complexes were formed as a consequence of the halide exchange reaction. The selective formation of PtI(SnCl₃)[2,4-bis(diphenylphosphino)pentane] was observed in the reaction of PtCl₂[2,4-bis(diphenylphosphino)pentane] and 0.5 SnCl₂ and 0.5 SnI₂. PtI(SnCl₃)[2,4-bis(diphenylphosphino)pentane], the first platinum complex which contains a chiral chelating diphosphine and SnCl₃ ligand, was structurally characterized by X-ray diffraction.