Is the Excited-State H-atom Transfer in Hypericin Concerted?¶

J. Park; A. Datta; P. K. Chowdhury; J. W. Petrich

doi:10.1562/0031-8655(2001)073<0105:ITESHA>2.0.CO;2

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J. Park,¹ A. Datta,¹ P. K. Chowdhury,¹ J. W. Petrich^1,*

¹Department of Chemistry, Iowa State University, Ames, IA

^*¶Posted on the website on 30 November 2000.*To whom correspondence should be addressed at: Department of Chemistry, Iowa State University, Ames, IA 50011, USA. Fax: 515-294-0105; jwp@iastate.edu

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.

Citation Download Citation

J. Park, A. Datta, P. K. Chowdhury, and J. W. Petrich "Is the Excited-State H-atom Transfer in Hypericin Concerted?," Photochemistry and Photobiology 73(2), 105-109, (1 February 2001). https://doi.org/10.1562/0031-8655(2001)073<0105:ITESHA>2.0.CO;2

Received: 15 September 2000; Accepted: 1 November 2000; Published: 1 February 2001

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