Synthesis of an unusual, high nuclearity osmium–platinum cluster: X -ray analysis of [Os 6 Pt 2 (CO) 16 (C 8 H 12 ) 2 ](C 8 H 12 = cyclo-octa-1,5-diene)

Reaction of [Os6(CO)18–n(NCMe)n], n= 1 or 2, with [Pt(C8H12)2](C8H12= cyclo-octa-1,5-diene) results in formation [Os6Pt2(CO)17(C8H12)2](1) and [Os6Pt2(CO)16(C8H12)2](2), respectively, and (2) has been shown by X-ray analysis to possess the unusual metal core geometry of two edge-fused Os tetrahedral, one of which is Pt-bicapped.