Confirmation of Excited-State Proton Transfer and Ground-State Heterogeneity in Hypericin by Fluorescence Upconversion | Zendy

Douglas S. English | Zendy; K. Das | Zendy; K. D. Ashby | Zendy; J. Park | Zendy; Jacob W. Petrich | Zendy; Edward W. Castner | Zendy

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Confirmation of Excited-State Proton Transfer and Ground-State Heterogeneity in Hypericin by Fluorescence Upconversion

Author(s) -

Douglas S. English,

K. Das,

K. D. Ashby,

J. Park,

Jacob W. Petrich,

Edward W. Castner

Publication year - 1997

Publication title -

journal of the american chemical society

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 7.115

H-Index - 612

eISSN - 1520-5126

pISSN - 0002-7863

DOI - 10.1021/ja9721071

Subject(s) - hypericin , chemistry , excited state , photon upconversion , fluorescence , photochemistry , proton , ground state , atomic physics , ion , optics , organic chemistry , medicine , physics , quantum mechanics , pharmacology

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.

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