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Multidimensional Reaction Coordinate for the Excited‐state H‐atom Transfer in Perylene Quinones: Importance of the 7‐Membered Ring in Hypocrellins A and B
Author(s) -
Datta Anindya,
Smirnov Alexandre V.,
Wen Jin,
Chumanov George,
Petrich Jacob W.
Publication year - 2000
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 - 10.1562/0031-8655(2000)0710166mrcfte2.0.co2
Subject(s) - excited state , chemistry , intramolecular force , ring (chemistry) , photochemistry , perylene , atom (system on chip) , fluorescence , photon upconversion , stereochemistry , molecule , atomic physics , physics , organic chemistry , ion , quantum mechanics , computer science , embedded system
The excited‐state intramolecular H‐atom transfer reactions of hypocrellins B and A are compared by using time‐resolved absorption and fluorescence upconversion techniques. The hypocrellin B photophysics are well described by a simple model involving one ground‐state species and excited‐state forward and reverse H‐atom transfer with a nonfluorescent excited state. We suggest that excited‐state conformational changes are coupled to the H‐atom transfer in hypocrellin B just as gauche / anti changes are coupled to the H‐atom transfer in hypocrellin A.