1249no Rh-Rh bond, while the Mo-Mo bond is over 0.4 A longer than the Mn-Mn bond in I, the bending angle of a bridging allene is quite insensitive to its environment.ls Another structural parameter is more responsive to such effects. Thus, it has been observed that the central carbon of a coordinated allene lies closer to the metal than does the terminal carbon. The difference between these metal-carbon bond lengths is 0.08 (7a) A in the dimeric rhodium complex,14 0.1 1 (4a) A in CP,MO~(CO)~C~H,,,~ and 0.20 (40a) A in I. The carboncarbon bond length in I (1.394 A) is 0.08 A longer than in allene itself (1.312 &.I3 Mass Spectral Fragmentation. The 70-eV electron impact mass spectrum of C P , M~~( C O )~( C~H~) indicates loss of a single CO ligand in overwhelming preference to loss of the allene fragment. The loss of allene or two carbonyls then become competitive paths. This contrasts with the mass spectral fragmentation of Cp2Mn2(C0)4(p2-s1-CCH2),1 in (15) The allene bending angle in a q2 nonbridging environment14 is 153O.
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