Reaction of [Os 5 (CO) 15 H 2 ] with acetylenes; X -ray crystal structures of [Os 5 (CO) 15 H 2 (CCPh)] and [Os 5 (CO) 13 (PhCCPh) 2 ]

The dihydrido-cluster [Os5(CO)15H2] reacts with R1CCR2[R1= H, R2= Ph; R1= R2= Ph] to produce a number of acetylenic cluster complexes based on the Os5 unit, two of which have been characterised spectroscopically and by single crystal X-ray analyses as [Os5(CO)15H2(CCPh)] and [Os5(CO)13(PhCCPh)2], containing a ‘wing-tip bridged butterfly’ and an ‘edge-bridged buterfly’ metal framework, respectively.