Concerning regioselective photochemical intermolecular proton transfer from hypericin

Authors
Obermuller, RA Schutz, GJ Gruber, HJ Falk, H
Citation
Ra. Obermuller et al., Concerning regioselective photochemical intermolecular proton transfer from hypericin, MONATS CHEM, 130(2), 1999, pp. 275-281
Citations number
28
Categorie Soggetti
Chemistry
Journal title
MONATSHEFTE FUR CHEMIE
ISSN journal
00269247 → ACNP
Volume
130
Issue
2
Year of publication
1999
Pages
275 - 281
Database
ISI
SICI code
0026-9247(199902)130:2<275:CRPIPT>2.0.ZU;2-B
Abstract
Using epifluorescence microscopy on lipid vesicles containing hypericin or several of its O-alkylated derivatives together with a fluorescence pH indi cator it was shown that upon excitation of the respective hypericinate ion an excited state derived proton is transferred to the indicator molecule. I n addition, it could be also unequivocally derived that this proton origina tes from one of the peri-hydroxyl groups of the pigment.