Metal atom motion, vibrational anisotropy and hydrogen bonding effects in octamethylferrocenylmethanol

Temperature dependent 57Fe Mössbauer effect measurements of octamethylferrocenylmethanol, using 57Fe enriched samples, have been carried out over the temperature range 90≤T≤320 K, and analyzed to elucidate the dynamics of the metal atom motion in this solid (Tmp=484 K). In consonance with earlier observation of related octamethylferrocenes (OMFcs), there is a significant drop in the recoil-free fraction at temperatures well below Tmp. However, the almost complete disappearance of the resonance effect observed earlier at T≪Tmp in OMFcs is absent, presumably due to a ring–ring interaction effected by hydrogen-bond coupling, consistent with room temperature infra-red data for this solid.