Xa. Mao et M. Holz, DYNAMIC ISOTOPE EFFECTS ON RELAXATION OF QUADRUPOLAR NUCLEI IN 12 SIMPLE ORGANIC-MOLECULES, Science in China. Series B, Chemistry, life sciences & earth sciences, 38(4), 1995, pp. 393-400
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.