Synthesis and X-ray Crystal Structures of (Au(CH2)2PPh2)2(CF3)2, (Au(CH2)2PPh2)2(C6F5)2, and (PPN)(Au(C6F5)4): Two Dinuclear Gold (II) Ylide Complexes Containing Alkyl and Aryl Ligands and a Tetrakis(pentafluorophenyl)aurate(III)

摘要

The gold(I) phosphorus ylide dimer (AU(CH2)2PPh2)2 (1) has several properties that make it a good model for physical and theoretical studies of bimetallic organometallic systems. It has proved to be a system that displays interesting features of structure and reactivity. Complex 1 contains a pair of two-coordinate Au(I) metal centers constrained in an eight-membered heterocyclic ring. The metal centers are electronically and sterically unsaturated, yet are held closely enough together to allow for Gold, Gold interaction. Complex 1 undergoes a facile two-center two-electron oxidative addition with halogens (for example Br2) and pseudohalogens (for example benzoyl peroxide) acquiring two ligands and a Au(II)-Au(II) bond with each four-coordinate metal center in a fused five-membered heterocyclic ring.