Structure of the ferrocene carboxaldehyde mesophase by X-ray diffraction and Mössbauer spectroscopy
- 1 January 1978
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Journal of the Chemical Society, Faraday Transactions 2: Molecular and Chemical Physics
- Vol. 74, 456-465
- https://doi.org/10.1039/f29787400456
Abstract
Ferrocene carboxaldehyde is unusual in that whilst its molecular shape is of low symmetry it shows a mesophase between 44°C and the m.p. (123°C). The nature of this phase has been investigated by X-ray diffraction and Mössbauer spectroscopy. It is shown to be an orientationally disordered molecular crystal, with a simple f.c.c. lattice (a= 999 ± 2 pm). The molecules are, on average, randomly oriented about their centres of mass C (rCFe= 46 pm). Short range correlations in molecular arrangement are accounted for by a Gaussian distribution of molecular centres with 〈U2 x〉½= 69 pm. In contrast the r.m.s. displacement of the Fe in the room temperature phase is 20 pm as for ferrocene.Keywords
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