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THE CHARACTERISATION OF THE TRIPLET STATE OF CROCETIN, A WATER SOLUBLE CAROTENOID, BY NANOSECOND LASER FLASH PHOTOLYSES
Author(s) -
Craw M.,
Lambert C.
Publication year - 1983
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.1751-1097.1983.tb03868.x
Subject(s) - flash photolysis , triplet state , chemistry , crocetin , photochemistry , molar absorptivity , psoralen , quantum yield , aqueous solution , extinction (optical mineralogy) , laser , carotenoid , fluorescence , molecule , dna , optics , physics , kinetics , organic chemistry , reaction rate constant , biochemistry , food science , quantum mechanics , mineralogy
— The triplet state of crocetin, which is a water soluble carotenoid, has been sensitized by psoralen. The triplet extinction coefficient, ε T (73000 dm 3 mol ‐1 cm ‐1 at 470 nm), the triplet‐triplet spectrum and the quantum yield of triplet formation, φ T (less than 1%) are reported in aqueous solution. In order to calculate the extinction coefficient of crocetin it was necessary to obtain ε T for psoralen in water (10000dm 3 mol ‐1 cm ‐1 at 450 nm). This latter value was obtained using the complete conversion technique and is reported with the triplet‐triplet spectrum.