Shirdel, Javid and Penzkofer, Alfons and Procházka, 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.
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The pyrene-flavin (isoalloxazine) dyad, PFD , 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 are 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) Förster-type energy transfer from pyrene to flavin followed by ground-state electron transfer from pyrene to flavin.
|Institutions:||Physics > Institute of Experimental and Applied Physics > Retired Professors > Group Alfons Penzkofer|
|Projects:||GRK 640 Sensory photoreceptors in natural and artificial systems|
|Keywords:||Isoalloxazine; Flavoquinone; Pyrene; 1-Methylpyrene; Dipeptide bridge; Absorption spectroscopy; Fluorescence spectroscopy; Photo-degradation; Förster-type energy transfer; Electron transfer|
|Subjects:||500 Science > 530 Physics|
|Refereed:||Yes, this version has been refereed|
|Created at the University of Regensburg:||Yes|
|Deposited On:||20 Mar 2007|
|Last Modified:||27 Aug 2012 14:12|