Alternative synthesis of binuclear gold(II) ylide complexes: cationic gold(II) complexes. X-Ray crystal structures of [{Au(CH2)2PPh2}2Br2] and [{Au(CH2)2PPh2}2(PPh3)2][CLO4]2

Abstract

The complex [{Au(CH₂)₂PPh₂}₂Cl₂] reacts with silver salts AgX to give the corresponding gold(II) derivatives [{Au(CH₂)₂PPh₂}₂X₂](X = C₆F₅, C₆H₂F₃–2, 4, 6, NO₃ or MeCO₂), whilst reaction with suitable silver complexes [AgX′(L)][X′= ClO₄, L = tetrahydrothiophene (tht) or PPh₃; X′= NO₃, L = PMe₃] gives cationic gold(II) derivatives [{Au(CH₂)₂PPh₂}₂L₂]X′₂, which either undergo metathetical reactions with MX [X = Br, SCN or S₂CN(CH₂Ph)₂] to give other neutral complexes inaccessible by the first procedure or react with neutral ligands L′ to afford other cationic complexes [L′= pyridine (py), AsPh₃ or SbPh₃]. The structures of [{Au(CH₂)₂PPh₂}₂Br₂] and [{Au(CH₂)₂PPh₂}₂(PPh₃)₂][ClO₄]₂ have been established by single-crystal X-ray diffraction studies.