Tyagi, A. and Penzkofer, A. and Mathes, T. and Hegemann, P. (2010) Photo-degradation behaviour of roseoflavin in some aqueous solutions. CHEMICAL PHYSICS, 369 (1). pp. 27-36. ISSN 0301-0104, 1873-4421
Full text not available from this repository. (Request a copy)Abstract
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.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | SPECTROSCOPIC CHARACTERIZATION; RIBOFLAVIN; ABSORPTION; FLUORESCENCE; DERIVATIVES; PHYCOMYCES; MOLECULES; FLAVINS; ANALOG; Roseoflavin; 8-Methylamino-riboflavin; Absorption spectroscopy; Fluorescence spectroscopy; Photo-induced charge-transfer; Photo-degradation; Triplet-singlet excitation transfer |
| Subjects: | 500 Science > 530 Physics |
| Divisions: | Physics > Institute of Experimental and Applied Physics > Alumni or Retired Professors > Group Alfons Penzkofer |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 03 Aug 2020 10:29 |
| Last Modified: | 03 Aug 2020 10:29 |
| URI: | https://pred.uni-regensburg.de/id/eprint/24962 |
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