The standard
Gibbs energy difference between the
transition state of a reaction (either an
elementary reaction or a
stepwise reaction) and the
ground state of the reactants. It is calculated from the experimental
rate constant
via the conventional form of the absolute rate equation:
where
is the
Boltzmann constant and
the
Planck constant
(
).
The values of the rate constants, and hence Gibbs energies of
activation, depend upon the choice of concentration units (or of the thermodynamic
standard state).
Source:
PAC, 1994, 66, 1077
(Glossary of terms used in physical organic chemistry (IUPAC Recommendations 1994))
on page 1118
PAC, 1996, 68, 149
(A glossary of terms used in chemical kinetics, including reaction dynamics (IUPAC
Recommendations 1996))
on page 166
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.
