The binuclear title complex [Pt2Me2(µ-H)(µ-dppm)2][PF6], dppm = Ph2PCH2PPh2, has been prepared and characterized by lH and 31P n.m.r. spectroscopy and by an X-ray structure determination. Crystals are monoclinic, with space group P21/c, a= 10.640(3), b= 20.341(3), c= 23.201(3)Å, β= 91.88(2)° and Z= 4. The structure has been solved by the heavy-atom method and refined to R= 0.053 for 5 374 reflections withl 3σ(I). The cation has the ‘A-frame’ structure with a Pt–Pt separation of 2.932(1)Å; a closed three-centre two-electron Pt2(µ-H) bonding system is proposed. The complex undergoes slow reductive elimination of methane induced by added PMe2Ph and is photochemically decomposed, but it has high thermal stability.
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Brown et al. (1982) studied this question.