Approaches to bi-and brimetallic platinum and p9alladium complexes using the DPPEPM ligand

摘要

Bis{(diphenylphosphinoethyl)phenylphosphino}methane (DPPEPM) reacts with [PtR_2(cod)] 1:a ratio to give [PtR_2(DPPEPM-PP)](2a,R=Me;2b,R=Ph),whereas with [PtCl_2(cod)] it yields the ionic species [M(DPPEPM-PP)_2]~(2+) (3 and 4).With [MClMe(cod)],the product is [MMe(DPPEPM-PPP)]~+ (5,M=Pt;6,M=Pd),in which one of the internal P atoms of the ligand is uncoordinated.These complexes undergo oxidation of the free P atom to give 7 and 8 and 8 on standing in solution.Complexes 2-4 may be used to construct bimetallic and trimetallic mixed metal complexes.The molecular structures of 7 and [PtMe_2(mu-DPPEPM)PdCl_2] (11) are reported.