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Is the excited-state H-atom transfer in hypericin concerted?
J Park1, A Datta, P K Chowdhury
1Department of Chemistry, Iowa State University, Ames 50011, USA.
Photochemistry and Photobiology
|March 29, 2001
Abstract:
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 Tb3+ 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.