DYNAMIC ISOTOPE EFFECTS ON RELAXATION OF QUADRUPOLAR NUCLEI IN 12 SIMPLE ORGANIC-MOLECULES

Dynamic isotope effects on relaxation rate of quadrupolar nuclei are p reliminarily reported. The relaxation rates of O-17 and N-14 in 12 sim ple organic molecules and their 18 corresponding deuterated species ha ve been systematically measured. The principal components of the molec ular inertia tensors have been calculated. The results show that there is an intrinsic correlation between the dynamic isotope effects of th e relaxation rate and the static isotope effects of the molecular iner tia. The concepts of molecular collision frequency and translation-rot ation coupling have been introduced into the NMR relaxation theory. Th erefore, a reasonable explanation of the experimental results has been given.