Frankfurt 2006 – scientific programme
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Q: Quantenoptik und Photonik
Q 72: Poster Laserspektroskopie
Q 72.2: Poster
Thursday, March 16, 2006, 16:30–18:30, Labsaal
Absorption and Emission Spectroscopic Characterisation of 10-Phenyl-Isoalloxazine Derivatives — •Javid Shirdel1, Alfons Penzkofer1, Roman Procházka2, Jörg Daub2, Eduard Hochmuth3, and Rainer Deutzmann3 — 1Institut II - Experimentelle und Angewandte Physik, Universität Regensburg, Universitätsstrasse 31, D-93053 Regensburg, Germany — 2Institut für Organische Chemie, Universität Regensburg, Universitätsstrasse 31, D-93053 Regensburg, Germany — 3Institut für Biochemie I, Universität Regensburg, Universitätsstrasse 31, D-93053 Regensburg, Germany
The flavoquinone dyes 10-phenyl-isoalloxazine-3-acetic acid ethyl ester and 10-(4-bromo-phenyl)-3-methyl-isoalloxazine in dichloromethane, acetonitrile, and methanol are characterized by absorption, emission, and mass spectroscopy. Absorption cross-section spectra, stimulated emission cross-section spectra, fluorescence quantum distributions, quantum yields, lifetimes, and degrees of fluorescence polarization are determined. The blue-light photo-degradation of the dyes is studied. Mass spectroscopic measurements reveal the formation of phenyl-benzo-pteridine (isoalloxazine) derivatives, tetraza-benzo-aceanthrylene derivatives, dihydro-quinoxaline derivatives, and pyrazino-carbazole derivatives. An enhancement of photo-degradation by the formed photo-fragments is observed.