Abstract
The UV protection and singlet-oxygen ( 1O 2) quenching activity of intramolecularly hydrogen-bonded hydroxyanthraquinone derivatives found in aloe have been studied by means of laser spectroscopy. The UV protective activity provided by excited-state intramolecular proton-transfer (ESIPT) in these molecules correlates with their 1O 2 quenching activity, and the UV protective molecules have high 1O 2-quenching function. The reason for this correlation can be understood by considering ESIPT-induced distortion of ground-state potential surfaces in encounter complexes with 1O 2.
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Schedule a callMore From: Journal of photochemistry and photobiology. A, Chemistry
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