Cluster Core Expansion through Incorporation of Transition-metal Fragments or an Alkyne Molecule into an Incomplete Cubane-type Fe2RuS4 Cluster

Treatment of CpS22Fe2S4 (CpS2 = 1,3-C5H3(SiMe3)2) with [CpRu(MeCN)3]+ in acetonitrile at room temperature led to the formation of an incomplete cubane-type cluster [(CpS2Fe)2(CpRu)S4]+ (1). Further treatment of 1 with [CpʹRu(MeCN)3]+ (Cpʹ = Cp, Cp*) produced [(CpS2Fe)2(CpRu)(CpʹRu)S4]2+. Cluster 1 reacted with DMAD to give the 1:1 adduct through formation of three sulfur–carbon bonds.