Syntheses of dinuclear gold(I) ring complexes containing two different bridging ligands. Crystal structure of [Au2{µ-(CH2)2PPh2}(µ-S2CNEt2)]

Abstract

The reaction of [Au₂{µ-(CH₂)₂PPh₂}₂] with [Au₂(µ-L–L)₂]ⁿ⁺[n= 0, L–L = S₂CNMe₂, S₂CNEt₂ or S₂CN(CH₂Ph)₂; n= 2, L–L = Ph₂PCH₂PPh₂(dppm), Ph₂P(CH₂)₂PPh₂ or Ph₂PNHPPh₂] led to heterobridged dinuclear complexes [Au₂{µ-(CH₂)₂PPh₂}(µ-L–L)]ⁿ⁺(n= 0 or 1). The same complexes can also be obtained by reaction of [N(PPh₃)₂][(AuCl)₂{µ-(CH₂)₂PPh₂}] with the silver compounds [Ag(S₂CNMe₂)]₆ or [Ag₂(OClO₃)₂(dppm)₃] or by reaction of [(AuPPh₃)₂{µ-(CH₂)₂PPh₂}][ClO₄] with [{Au(C₆F₅)}₂(µ-L–L)](L–L = diphosphines or o-Ph₂PC₅H₄N). The structure of [Au₂{µ-(CH₂)₂PPh₂}(µ-S₂CNEt₂)] has been established by X-ray crystallography. Two molecules are bonded through an intermolecular gold–gold interaction, thus forming a linear chain of four gold atoms with Au–Au (intramolecular) 2.867, 2.868, (intermolecular) 2.984 Å.