Syntheses of dinuclear gold( I ) ring complexes containing two different bridging ligands. Crystal structure of [Au 2 {µ-(CH 2 ) 2 PPh 2 }(µ-S 2 CNEt 2 )]

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.