Tyagi, A. and Penzkofer, A. (2010) Fluorescence spectroscopic behaviour of folic acid. CHEMICAL PHYSICS, 367 (2-3). pp. 83-92. ISSN 0301-0104, 1873-4421
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The fluorescence spectroscopic behaviour of folic acid (FA) in 4 M HCl (dominant bi-cationic form), 0.1 M HCl (bi-cationic and cationic form), citric acid-NaOH pH 6 buffer (neutral form), 0.1 M and 4 M KOH (anionic form), and trifluoroacetic acid is studied. The thermal stability is investigated. Absolute absorption cross-section spectra are determined and compared with fluorescence excitation spectra. Intrinsic fluorescence quantum distributions and fluorescence quantum yields are extracted from fluorescence spectra measurements. The temporal fluorescence decay after picosecond pulse excitation is studied. The fluorescence quenching mechanisms for the different ionic forms of FA are discussed: excited-state proton release for bi-cationic FA, photo-physical non-radiative relaxation for cationic FA, and photoinduced intra-molecular electron transfer for neutral and anionic FA. Aerobic FA in 4 M KOH at elevated temperature dehydrated to 9,10-dehydro-folic acid. Its photo-dynamics was governed by twisted intramolecular charge transfer and photo-isomerisation. (C) 2009 Elsevier B.V. All rights reserved.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | ROOM-TEMPERATURE PHOSPHORESCENCE; AQUEOUS-SOLUTION; ELECTRON-TRANSFER; PTERIN DERIVATIVES; DIHYDROFOLIC ACID; NUCLEIC-ACIDS; DYE VAPORS; ABSORPTION; STATE; PHOTOCHEMISTRY; Folic acid; Absorption cross-section spectra; Fluorescence excitation spectra; Fluorescence quantum distributions; Fluorescence lifetimes; Photo-induced proton release; Intra-molecular electron transfer; 9,10-Dehydro-folic acid |
| 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: | 07 Aug 2020 08:11 |
| Last Modified: | 07 Aug 2020 08:11 |
| URI: | https://pred.uni-regensburg.de/id/eprint/25159 |
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