CONSTRUCTION OF UNUSUAL METAL-CLUSTERS USING DICARBON (C2) AS A COLLAR - EXAMPLES BASED ON PERMETALLABICYCLO[2.2.0]HEXANE FRAMEWORKS

The pentanuclear C2 complex [RU5(mu5-C2)(mu-SMe)2(mu-PPh2)2(CO)11] 1 is a source of novel cluster frameworks which incorporate the C2 ligand as a collar; this is exemplified by the structures of [FeRu5(mu6-C2)(mu-SMe)2(mu-PPh2)2(CO)14] 2 and [Co4Ru5(mu10-C2)(mu3-SMe)2(mu-PPh2)2(mu-CO)7(CO)11] 4, obtained from reactions between 1 and [Fe2(CO)9] or [Co2(CO)8], respectively.