A
rate of reaction corresponding to the rate of
encounter of the reacting
molecular entities. This is also known as '
diffusion-controlled rate' since rates of
encounter are themselves controlled by
diffusion rates (which in turn depend on the
viscosity of the
medium and the dimensions of the reactant molecular entities). For a
bimolecular reaction between solutes in water at
an
encounter-controlled rate is calculated to have a second-order
rate constant of about
.
Source:
PAC, 1994, 66, 1077
(Glossary of terms used in physical organic chemistry (IUPAC Recommendations 1994))
on page 1112
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.
