Unsymmetrical bridging of an acetylide ligand in the cation [Pt2(CCBut)3(µ-dppm)2]+(dppm = Ph2PCH2PPh2): X-ray structure determination of the tetraphenylborate salt

Abstract

Treatment of [PtCl₂(dppm-PP′)](dppm = Ph₂PCH₂PPh₂) with LiCCBu^t in tetrahydrofuran gives [Pt₂(CCBu^t)₃(µ-dppm)₂]Cl in 59% yield. The X-ray crystal structure of the BPh₄ salt shows that the cation has an unsymmetrically bridged (σ,π bonded) acetylide ligand in the solid state; in solution, fluxional behaviour is indicated by the time averaging of the ³¹P and ¹H n.m.r. spectra.