CLUSTER CHEMISTRY .67. REACTIONS OF SOME FE-IR CLUSTERS - CRYSTAL-STRUCTURES OF FE2IR(MU-H)(MU-3-CCHPH)(CO)8(PPH3) AND AU2FE2IR(MU-4-C2PH)(CO)7(PPH3)3

Isomeric hydrido-vinylidene and -alkyne complexes Fe2Ir(mu-H)(mu-3-X)(CO)8(PPh3) (X = CCHPh, HC2Ph) were obtained from Fe2Ir(mu-3-C2Ph)(CO)8(PPh3) and H2 or H-/H+. The X-ray structure of the vinylidene complex is reported. Cluster complexes containing gold, iron and iridium were obtained from AuCl(PPh3) or [O{Au(PPh3)}3]+ and anionic species prepared from Fe2Ir(mu-3-C2Ph)(CO)8(PPh3). The mono-gold species AuFe2Ir(mu-3-HC2Ph)(CO)8(PPh3)2 and the tri-gold cluster Au3Fe2Ir(C2HPh)(CO)7(PPh3)4 were identified spectroscopically, whereas the digold complex Au2Fe2Ir(mu-4-C2Ph)(CO)7(PPh3)3 was shown crystallographically to have an unusual structure in which one of the gold atoms bridges the acetylide C-alpha and the Ir atom. The rhodium analogue was also obtained.