Bimetallic systems. Part 18. Nickel(II)-mercury(II) acetylide complexes containing bridging Ph2PCH2PPh2 ligands

Abstract

Treatment of [Ni(dppm-P)₂X₂](dppm = Ph₂PCH₂PPh₂; X = Cl, Br, or I) with Hg(CCR)₂(R = Ph or p-tolyl) in benzene or dichloromethane solution gives the yellow complexes [(RCC)₂Ni(µ-dppm)₂-HgX₂]. Treatment of [Ni(dppm-P)₂Cl₂] with two equivalents of [Au(PPh₃)(CCR)] gives what appears to be [(RCC)₂Ni(µ-dppm)₂Au] Cl, characterized by ³¹P-{¹H} n.m.r. spectroscopy, but too labile to be isolated pure. Attempts to synthesize other Ni^II-containing heterobimetallic complexes are also described.