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A STUDY OF THE PHOTOCHEMICAL PROPERTIES OF SOME CINNAMATE SUNSCREENS BY STEADY STATE AND LASER FLASH PHOTOLYSIS
Author(s) -
Morlière P.,
Avice O.,
Melo T. Sa E,
Dubertret L.,
Giraud M.,
Santus R.
Publication year - 1982
Publication title -
photochemistry and photobiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.818
H-Index - 131
eISSN - 1751-1097
pISSN - 0031-8655
DOI - 10.1111/j.1751-1097.1982.tb04392.x
Subject(s) - photoisomerization , flash photolysis , photochemistry , chemistry , isomerization , laser , psoralen , triplet state , photodissociation , aqueous solution , organic chemistry , molecule , kinetics , optics , reaction rate constant , dna , physics , quantum mechanics , catalysis , biochemistry
The E ⇄ Z photoisomerization of 4′‐methoxycinnamates, used as sunscreens in cosmetics, has been studied by steady state and laser flash photolysis, in aqueous and organic solutions. Photoisomerization quantum yields are found to be fairly high (˜0.5‐1), although no intermediate is detected upon laser flash photolysis. Cinnamates are not photodynamic sensitizers but are able to quench the 8‐methoxy‐psoralen and 5‐methoxypsoralen triplets which produces E → Z isomerization.