photoisomerismn.
/ˌfəʊtəʊʌɪˈsɒmərɪz(ə)m/, U.S. /ˈˌfoʊdoʊˌaɪˈsɑməˌrɪz(ə)m/ Chemistry.
The property of a compound of having two or more forms which can be converted from one to another by the action of light; this phenomenon.
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photoisomerism1940
1940 Proc. Royal Soc. A. 174 212 Incidentally this is the explanation of cis-trans photoisomerism by absorption of light.
1965 H. H. Seliger & W. D. McElroy Light ii. 144 The photoisomerism of 11-cis retinene.
1995 Jrnl. Amer. Chem. Soc. 117 7326/2 We tentatively designate the major new product in each case as the cis isomer by analogy to the many examples of photoisomerism observed for related substituted stilbenes.
This entry has been updated (OED Third Edition, March 2006; most recently modified version published online March 2022).
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n.1940