Is the excited-state H-atom transfer in hypericin concerted?
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.
Park
J
J
Department of Chemistry, Iowa State University, Ames 50011, USA.
Datta
A
A
Chowdhury
P K
PK
Petrich
J W
JW
D000873:Anthracenes; D000998:Antiviral Agents / Q000737:chemistry / Q000528:radiation effects; D002614:Chelating Agents; D006859:Hydrogen / Q000737:chemistry; D006863:Hydrogen-Ion Concentration; D008823:Micelles; D009281:Naphthalenes; D010569:Perylene / Q000031:analogs & derivatives* / Q000737:chemistry* / Q000528:radiation effects; D010777:Photochemistry; D011522:Protons; D000077291:Terbinafine
D000873:Anthracenes; D000998:Antiviral Agents; D002614:Chelating Agents; D008823:Micelles; D009281:Naphthalenes; D011522:Protons; D010569:Perylene; C004965:hypericin; D006859:Hydrogen; D000077291:Terbinafine