photoisomern.
/ˌfəʊtəʊˈʌɪsəmə/, U.S. /ˌfoʊdoʊˈaɪsəmər/ Chemistry.
An isomer formed by the action of light on a different, often more stable, form of a compound.
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photoisomer1957
1957 Jrnl. Amer. Chem. Soc. 79 2321/1 Titration of IX with perbenzoic acid established the presence of only one double bond, and the photoisomer should therefore contain two carbocyclic rings.
1973 Tetrahedron 29 3869/1 This new photoisomer is formed from heptachlor epoxide exposed to sunlight on bean leaves only in the presence of a photosensitizer.
2002 Amer. Family Physician (Nexis) 15 Feb. 599 The bilirubin is converted to less toxic water-soluble photoisomers that are excreted in the bile and urine without conjugation.
This entry has been updated (OED Third Edition, March 2006; most recently modified version published online March 2022).
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n.1957