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The stereodynamics of metal-metal bonds has remained virtually unexplored until very recently. It is now known that the barriers for the degenerate reorientation of metal-metal bonds can be substantial.1•1 2 This opens the way for the preparation of clusters which differ on the basis of their metalmetal bonding networks. A test of this idea entails demonstration that clusters can exist as geometric isomers based exclusively on the relative positions of -M bonds. This type of process assumes added significance to the extent that -M bonding provides an electrochemically addressable means of controlling the structures of multimetallic frameworks.The reaction of (CsMeshRuaS^w ith 2 equiv of (CsHsjRu-(MeCN)g+ 4 (MeCN solution, 25 °C) proceeds according to eq l.5 The red-brown salt [(CsHsMCsMeshRuqSa](PFe)2 ([!]-(PF6)2) was obtained in high yield and good purity.6•7 (C5Me5)2Ru2S4 + 2(C5H5)Ru(MeCN)3+ -(C5H5)2(C5Me5)2Ru4S42+ + 6MeCN (1)

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