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.
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1 February 2000
Multidimensional Reaction Coordinate for the Excited-state H-atom Transfer in Perylene Quinones: Importance of the 7-Membered Ring in Hypocrellins A and B
Anindya Datta,
Alexandre V. Smirnov,
Jin Wen,
George Chumanov,
Jacob W. Petrich
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Photochemistry and Photobiology
Vol. 71 • No. 2
February 2000
Vol. 71 • No. 2
February 2000
fluorescence upconversion
hydrogen atom transfer
hypericin
Hypocrellin
transient absorption