期刊
CHEMICAL PHYSICS
卷 369, 期 1, 页码 27-36出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.chemphys.2010.02.004
关键词
Roseoflavin; 8-Methylamino-riboflavin; Absorption spectroscopy; Fluorescence spectroscopy; Photo-induced charge-transfer; Photo-degradation; Triplet-singlet excitation transfer
资金
- Deutsche Forschungsgemeinschaft (DFG) [GK640, FOR526, SFB 498]
- Cluster of Excellence
An absorption and emission spectroscopic characterization of roseoflavin (8-dimethylamino-8-demethylriboflavin, RoF) in aqueous solutions was carried out. The studies were concentrated on roseoflavin in pH 8 phosphate buffer. Absorption cross-section spectra, fluorescence excitation spectra, fluorescence quantum distributions, fluorescence quantum yields and fluorescence lifetimes were determined. The fluorescence of RoF is quenched by photo-induced intra-molecular charge-transfer at room temperature. The photo-degradation of RoF in un-buffered water, in Tris-HCl buffer, and in phosphate buffer was studied. Phosphate buffer and to a smaller extent Tris buffer catalyse the RoF photo-degradation. Photo-excitation of the primary photoproduct, 8-methylamino-riboflavin (8-MNH-RF), enhanced the RoF degradation by triplet 8-MNH-RF - singlet RoF excitation transfer with subsequent triplet-state RoF degradation. (C) 2010 Elsevier B.V. All rights reserved.
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