Incoherent quasi-elastic and inelastic neutron scattering experiments have been performed on crystalline ferrocene carboxaldehyde in both its ordered (T < 317 K) and disordered (317 < T/K < 396) phases. The unsubstituted ring is found to be undergoing five-fold jump reorientations between indistinguishable positions at all temperatures within range of the experimental resolution (T > 170 K), with an energy barrier of 17 ± 4 kJ mol-1. The molecular motions in the disordered phase are found to be complex and involve internal rotation plus whole-molecule rotational and translational components, consistent with structural work. They are associated with time-scales in the range 10-10 -10-12 s and a range of energy barriers up to 20 kJ mol-1.
|Number of pages||13|
|Journal||Journal of the Chemical Society, Faraday Transactions 2: Molecular and Chemical Physics|
|Publication status||Published - 1 Dec 1981|