Shirdel, J. and Penzkofer, Alfons and Prochazka, R. and Shen, Z. and Strauss, J. and Daub, Joerg (2007) Absorption and emission spectroscopic characterisation of a pyrene-flavin dyad. CHEMICAL PHYSICS, 331 (2-3). pp. 427-437. ISSN 0301-0104, 1873-4421
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The pyrene-flavin (isoalloxazine) dyad, PFD {C44H31N5O5; CA Index name: 1-pyrenepropanoic acid, alpha-[[4,10-dihydro-2,4-dioxo-10-phenylbenzo[g]pteridin-3(2H)-yl)acetyl]amino]-, phenylmethyl ester, (alpha R)-(9Cl); CA Registry number: 618907-57-6}, 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, quantum yields, and degrees of fluorescence polarisation Lire determined. The fluorescence decay after femtosecond pulse excitation is determined by fluorescence up-conversion. The ground-state absorption recovery is determined by picosecond pump and probe transmission measurements. The dye photo-stability is investigated by observation of absorption spectral changes due to prolonged blue-light excitation. The absorption spectrum of PFD dyad resembles the superposition of the absorption of isoalloxazine (flavin) and 1-methylpyrene. Long-wavelength photo-excitation of the flavin moiety causes fluorescence quenching by ground-state electron transfer from pyrene to isoalloxazine. Short-wavelength photo-excitation of the pyrene moiety causes (i) excited-state electron transfer from pyrene to isoalloxazine, and (ii) Forster-type energy transfer from pyrene to flavin followed by ground-state electron transfer from pyrene to flavin. (c) 2006 Elsevier B.V. All rights reserved.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | BLUE-LIGHT PHOTORECEPTORS; FLUORESCENCE BEHAVIOR; SILICATE XEROGEL; AQUEOUS-SOLUTION; MODEL SYSTEM; SOLVENT; PHOTOPHYSICS; SINGLET; EXCIMER; SPECTRA; isoalloxazine; flavoquinone; pyrene; 1-methylpyrene; dipeptide bridge; absorption spectroscopy; fluorescence spectroscopy; photo-degradation; Forster-type energy transfer; electron transfer |
| Subjects: | 500 Science > 530 Physics 500 Science > 540 Chemistry & allied sciences |
| Divisions: | Physics > Institute of Experimental and Applied Physics > Alumni or Retired Professors > Group Alfons Penzkofer Chemistry and Pharmacy > Institut für Organische Chemie > Alumni or Retired Professors > Prof. Dr. Jörg Daub |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 23 Dec 2020 08:57 |
| Last Modified: | 23 Dec 2020 08:57 |
| URI: | https://pred.uni-regensburg.de/id/eprint/33300 |
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