Photochemical process leading to an isomerization
of the substrate,
either by bond rotation, skeletal rearrangement
or atom- or group- transfer.
- Typical examples are cis-trans photosomerization of alkenes,
polyenes and phototautomerization.
- Photochemical pathways have the advantage over thermal and catalytic methods
of giving isomer mixtures (photostationary states) rich in thermodynamically unstable isomers.
- Photoisomerization is the primary photochemical reaction of the chromophore
in several biological photoreceptors such as retinal proteins
(e.g., rhodopsin), phytochromes, and the photoactive yellow protein.
PAC, 2007, 79, 293
(Glossary of terms used in photochemistry, 3rd edition (IUPAC Recommendations 2006))
on page 393
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. doi:10.1351/goldbook