Tetrametallic Copper and Gold Derivatives of a Cyano-Iridium-Diiron-Monocarborane Cluster

The cyano-iridium-diiron complex [N(PPh3)2][8,10-{Ir(μ-PPh2)(CN)(Ph)(PPh3)}-8-(μ-H)-6,6,6,10,10-(CO)5-closo-6,10,1-Fe2CB7H7] (3) has been synthesized by reaction of a THF solution of [8,10-{Ir(μ-PPh2)(Ph)(CO)(PPh3)}-8-(μ-H)-6,6,6,10,10-(CO)5-closo-6,10,1-Fe2CB7H7] (2) with [NEt4]CN in the presence of Me3NO, followed by metathesis with [N(PPh3)2]Cl. Compound 3 in CH2Cl2 with [CuCl(PPh3)]4 or [AuCl(PPh3)], in the presence of TlPF6, yields [8,10-{Ir(μ-PPh2)(Ph){(CN)M(PPh3)n}(PPh3)}-8-(μ-H)-6,6,6,10,10-(CO)5-closo-6,10,1-Fe2CB7H7] (M = Cu, n = 2 (4) or M = Au, n = 1 (5), respectively). The structures of 4 and 5 have been established by X-ray diffraction experiments.