Set of rules proposed in 1975 to classify
photochemical reactions based on
correlation diagrams and under the assumption that all photochemical processes are controlled by the generation
of
primary products with characteristics of
diradicals, i.e., considering the physical fact that the initial single excitation separates
two electrons of a pair into two distinct orbitals. The reactions are classified according
to their
topicity, i.e., the total number and nature of available radical sites generated in the primary
photochemical product.
Source:
PAC, 2007, 79, 293
(Glossary of terms used in photochemistry, 3rd edition (IUPAC Recommendations 2006))
on page 320
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.
