Shirdel, J. and Penzkofer, A. and Prochazka, R. and Shen, Z. and Daub, J. (2007) Absorption and fluorescence spectroscopic characterisation of a phenothiazine-flavin dyad. CHEMICAL PHYSICS, 336 (1). pp. 1-13. ISSN 0301-0104, 1873-4421
Full text not available from this repository. (Request a copy)Abstract
The phenothiazine-phenylene-isoalloxazine dyad, 3-methyl-10-[4-(10-heptyl-10H-phenothiazin-3-yl)-phenyl]-10H-benzo[g]pteridine-2,4-dione, dissolved in either dichloromethane or acetonitrile is characterized by absorption and emission spectroscopy. Absorption cross-section spectra, stimulated emission cross-section spectra, fluorescence quantum distributions, fluorescence quantum yields, and degrees of fluorescence polarisation are determined. The fluorescence decay is determined by time-resolved measurements. The dye photo-stability is investigated by observation of absorption spectral changes due to prolonged blue-light excitation. The absorption spectrum of the dyad resembles the superposition of the absorption of the isoalloxazine (flavin) moiety and of the phenylphenothiazine moiety. Photo-excitation of the flavin moiety causes fluorescence quenching by ground-state reductive electron transfer from phenylphenothiazine to isoalloxazine followed by charge recombination. Photo-excitation of the phenothiazine moiety causes (i) efficient excited-state oxidative electron transfer from phenothiazine to isoalloxazine with successive recombination, and (ii) moderate energy transfer followed by ground-state phenothiazine electron transfer and recombination. (c) 2007 Elsevier B.V. All rights reserved.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | PHOTOINDUCED ELECTRON-TRANSFER; BLUE-LIGHT PHOTORECEPTORS; CHARGE SEPARATION; ENERGY-TRANSFER; PYRENE DYADS; BIOLOGICAL MOLECULES; AQUEOUS-SOLUTION; PHOTOPHYSICS; RIBOFLAVIN; BEHAVIOR; isoalloxazine; flavin; phenothiazine; dyad; absorption spectroscopy; fluorescence spectroscopy; fluorescence up-conversion; photo-degradation; Forster-type energy transfer; dexter-type energy transfer; photo-induced electron transfer; charge recombination |
| 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: | 04 Dec 2020 10:20 |
| Last Modified: | 04 Dec 2020 10:20 |
| URI: | https://pred.uni-regensburg.de/id/eprint/32502 |
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