NMR study of group rotation in solid 8-Hydroxyquinoline

Abstract

Wide line NMR investigation on solid 8-Hydroxyquinoline have been made over the temperature region 77-380° K. The crystal lattice was found to be effectively rigid at temperatures lower than 230°K and a width transition has been observed between 230-300°K which has been attributed to the molecular reorientation and OH group rotation about C-0 bond. No change in crystalline structure up to the melting point was observed. The activation energy for the motion in the transition region was obtained to be 10 K CaYmol approximately.