The crystal and molecular structure of acetylcyclopentadienyl-manganese and -rhenium tricarbonyls - Khotsyanova, T.L.; Kuznetsov, S.I.; Bryukhova, E.V.; V. Makarov, Y. (Elsevier)
The X-ray investigation of the title compounds has shown that in CH"3COC"5H"4Mn(CO)"3 the orientation of CO groups with respect to the cyclopentadienyl ring is almost the same as in the unsubstituted manganese compound whereas in CH"3COC"5H"4Re(CO)"3 the orientation is different to that in C"5H"5Re(CO)"3, so that the molecule as a whole becomes less symmetrical. Unsubstituted cyclopentadienyl-manganese and -rhenium tricarbonyls are isostructural and entirely analogous; that the two acetyl derivatives are not isostructural is possibly caused by conformational differences. Both molecules have the ''piano stool'' configuration with the CH"3CO group almost coplanar with the cyclopentadienyl ring plane. Interatomic distances and bond angles in these molecules are typical for this type of compound.
http://linkinghub.elsevier.com/retrieve/pii/S0022-328X(00)89511-X
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