Campus Units

Chemistry

Document Type

Article

Publication Version

Published Version

Publication Date

12-3-1997

Journal or Book Title

Journal of the American Chemical Society

Volume

119

Issue

48

First Page

11585

Last Page

11590

DOI

10.1021/ja9721071

Abstract

Fluorescence upconversion measurements of hypericin and its methylated analog, O-hexamethoxyhypericin, which possesses no labile protons, confirm excited-state proton (or hydrogen atom) transfer as the primary photophysical event in hypericin. The presence of a rising component in the time-resolved fluorescence of hypericin and the absence of such a component for the hexamethoxy analog are consistent with our assignment of excited-state proton or atom transfer as the primary photophysical process in the light-activated antiviral compound, hypericin. The results using the fluorescence upconversion technique, which detects only emission from the excited state, are in good agreement with our previous transient absorbance measurements. The results are also consistent with a heterogeneous ground state of hypericin.

Comments

Reprinted (adapted) with permission from Journal of the American Chemical Society 119 (1997): 11585, doi: 10.1021/ja9721071. Copyright 1997 American Chemical Society.

Copyright Owner

American Chemical Society

Language

en

File Format

application/pdf

Included in

Chemistry Commons

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