Acta Cryst. (2003). E59, m33-m35  [ doi:10.1107/S1600536802022262 ]

Redetermination of the structure of diferrocenyl ketone at low temperature

N. Bratych, K. Hassall and J. White

Abstract: The structure of diferrocenyl ketone, [Fe₂(C₅H₅)₂(C₁₁H₈O)], was redetermined as part of our investigations of carbon-iron hyperconjugation. The title ketone lies on a twofold axis of symmetry. Lengthening of the carbonyl C=O bond [1.237 (3) Å compared with that expected for simple ketones, 1.210 Å] and slight slippage of the Fe atom towards the carbonyl carbon are consistent with the presence of strong hyperconjugation of the carbonyl group with the adjacent Fe-C bond. The structure was determined at 130 K.

Online 24 December 2002

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