Halogen Exchange in Platinum−Phosphine−Tin(II) Halide Systems. Characterization of the Novel PtI(SnCl<sub>3</sub>)[(2<i>S</i>,4<i>S</i>)-2,4-bis(diphenylphosphino)pentane] Complex

The investigation of the PtCl<sub>2</sub>(diphosphine) + SnI<sub>2</sub> and PtI<sub>2</sub>(diphosphine) + SnCl<sub>2</sub> 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(SnCl<sub>3</sub>)(diphosphine) and PtI(SnCl<sub>2</sub>I)(diphosphine) complexes were formed as a consequence of the halide exchange reaction. The selective formation of PtI(SnCl<sub>3</sub>)[2,4-bis(diphenylphosphino)pentane] was observed in the reaction of PtCl<sub>2</sub>[2,4-bis(diphenylphosphino)pentane] and 0.5 SnCl<sub>2</sub> and 0.5 SnI<sub>2</sub>. PtI(SnCl<sub>3</sub>)[2,4-bis(diphenylphosphino)pentane], the first platinum complex which contains a chiral chelating diphosphine and SnCl<sub>3</sub> ligand, was structurally characterized by X-ray diffraction.