The compound [8,8-(PPh3)2-8,7-RhSBgHlo], (I), has a formal closo electron count but a nido structure, exhibits unusual fluxional behaviour in solution and reacts to ive both closo and nido compounds, e.g., cIos0-[2,3-(PPh~)~-3-(CI)-y-2; 3-(CI)-2-(Ph2P sH4)-2,3,1 -Rh2S gHs], (21, and nid0-[8,8-(PPh~)~-y-8;9-(S~CH)-8,7-RhSB~H~], (3); the structures of ( l ) , (2), and (3) were determined by X-ray crystallographic methods.
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