A
secondary isotope effect attributed to the different vibrational amplitudes of
isotopologues. For example, both the mean and mean-square amplitudes of vibrations associated with
C–H
bonds are greater than those of
C–D
bonds. The greater effective bulk of molecules containing the former may be manifested
by a
steric effect on a rate or
equilibrium constant.
Source:
PAC, 1994, 66, 1077
(Glossary of terms used in physical organic chemistry (IUPAC Recommendations 1994))
on page 1131
Cite as:
IUPAC. Compendium of Chemical Terminology, 2nd ed. (the "Gold Book"). Compiled by
A. D. McNaught and A. Wilkinson. Blackwell Scientific Publications, Oxford (1997).
XML on-line corrected version: http://goldbook.iupac.org (2006-) created by M. Nic,
J. Jirat, B. Kosata; updates compiled by A. Jenkins. ISBN 0-9678550-9-8.
https://doi.org/10.1351/goldbook.
