photoisomerizationn.
/ˌfəʊtəʊˌʌɪsəmərʌɪˈzeɪʃn/, U.S. /ˈˌfoʊdoʊˌaɪsəməˌraɪˈzeɪʃ(ə)n/ Chemistry.
The conversion of a compound from one isomer to another by the action of light; the formation of a photoisomer.
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photoisomerization1913
1913 Jrnl. Physical Chem. 17 561 The author [sc. A. Benrath in Lehrbuch der Photochemie (1912) 124] considers that photochemical processes may be grouped under four heads: photosynthesis; photolysis; photo-isomerization and photo-polymerization; photo-oxidation and photo-reduction.
1926 H. A. Spoehr Photosynthesis v. 285 They tried to detect the photoisomerization of the chlorophyll-carbonic acid complex.
1965 H. H. Seliger & W. D. McElroy Light v. 305 When rhodopsin in the retina is exposed to white light, the result is a photoisomerization to the yellow-colored all-trans form through several intermediate steps.
1992 Personal Computer World Nov. 428/1 When bacteriorhodopsin absorbs light, it undergoes photoisomerisation, a change in its molecular structure caused by a shift in electron density.
This entry has been updated (OED Third Edition, March 2006; most recently modified version published online March 2022).
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