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Absorption and emission spectroscopic characterization of alloxazine in aqueous solutions

Penzkofer, Alfons



Abstract

The absorption and emission spectroscopic behavior of alloxazine is studied in aqueous solutions at pH 4 (10(-4)M HCl) and pH 10 (10(-4)M NaOH). At pH 4 only the pure form of alloxazine is present, while at pH 10 about 9% of alloxazine is present in its tautomeric form of isoalloxazine. Absorption cross-section spectra, fluorescence emission quantum distributions, fluorescence excitation quantum ...

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