Novel complexes containing Pt3 (p3-SnX3) groups have been prepared by reaction of [Pt3(p3-CO)(p-dppm)3][PF6]2 (dppm = Ph2PCH2PPh2) with organotin hydrides or with SnX3-and are of interest as possible models for heterogeneous Pt-Sn/support catalysts; the structures of [Pt3{ p3-SnMe2(P02F2)} ( p -d ~p m ) ~] + and disordered { [Pt3(p3-snF3)(p3-CO)(p-dppm)~][PFGI)0.~~ [Pt3(p3-SnF3)(p3-CI)(p-dppm)310.25 are determined, the latter being the first SnF3-complex to be crystallographically characterized.Pt-Sn complexes and Pt-Sdsupport combinations are very Ph2PCH2PPh2), which can mimic some properties of a Pt useful in homogeneous and heterogeneous catalysis, respec-~u r f a c e . ~ The only structurally characterized Pt3Sn complexes tively.1-2 In the heterogeneous system there is much tin(11)3 as appear to be [Pt3(p3-SnC13)&od),1 (cod = cyclo-octa-1,5well as tin(0) and this prompted a study of how tin(I1) diene)s*6 and the p2-Sn species [Pt3(CO)3{p2-Sn(NR2)2}3] (R fragments might interact with the co-ordinatively unsaturated = SiMe3).7 Some results are given in Scheme 1. cluster cation [Pt3( p3-CO)(p-dppm)3]2+, (1) (dppm = Initially, reactions of (l), as the PF6salt, with organotin
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