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Is the Excited‐State H‐atom Transfer in Hypericin Concerted? ¶
Author(s) -
Park J.,
Datta A.,
Chowdhury P. K.,
Petrich J. W.
Publication year - 2001
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(2001)0730105itesha2.0.co2
Subject(s) - hypericin , intramolecular force , excited state , chemistry , photochemistry , hydrogen atom , atom (system on chip) , micelle , absorption (acoustics) , heptane , ultrafast laser spectroscopy , stereochemistry , atomic physics , spectroscopy , organic chemistry , materials science , medicine , physics , alkyl , composite material , quantum mechanics , aqueous solution , computer science , pharmacology , embedded system
The excited‐state intramolecular H‐atom transfer of hypericin (Hyp) was investigated as a function of pH in monodispersed reverse micelles formed by sodium bis(2‐ethylhexyl)sulfosuccinate/heptane/water and in complexes with Tb 3+ under conditions in which one of the two carbonyl groups of Hyp is incapable of accepting a hydrogen atom. The results of pump‐probe transient absorption experiments provide no evidence for a concerted H‐atom transfer mechanism.