Ensslen, Philipp and Brandl, Fabian and Sezi, Sabrina and Varghese, Reji and Kutta, Roger-Jan and Dick, Bernhard and Wagenknecht, Hans-Achim (2015) DNA-Based Oligochromophores as Light-Harvesting Systems. CHEMISTRY-A EUROPEAN JOURNAL, 21 (26). pp. 9349-9354. ISSN 0947-6539, 1521-3765
Full text not available from this repository. (Request a copy)Abstract
The chromophores ethynyl pyrene as blue, ethynyl perylene as green and ethynyl Nile red as red emitter were conjugated to the 5-position of 2-deoxyuridine via an acetylene bridge. Using phosphoramidite chemistry on solid phase labelled DNA duplexes were prepared that bear single chromophore modifications, and binary and ternary combinations of these chromophore modifications. The steady-state and time-resolved fluorescence spectra of all three chromophores were studied in these modified DNA duplexes. An energy-transfer cascade occurs from ethynyl pyrene over ethynyl perylene to ethynyl Nile red and subsequently an electron-transfer cascade in the opposite direction (from ethynyl Nile red to ethynyl perylene or ethynyl pyrene, but not from ethynyl perylene to ethynyl pyrene). The electron-transfer processes finally provide charge separation. The efficiencies by these energy and electron-transfer processes can be tuned by the distances between the chromophores and the sequences. Most importantly, excitation at any wavelength between 350 and 700nm finally leads to charge separated states which make these DNA samples promising candidates for light-harvesting systems.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | NILE RED; PERYLENE BISIMIDE; ENERGY-TRANSFER; ANTENNA; STACKS; POLYFLUOROPHORES; NONCOVALENT; ASSEMBLIES; CHEMISTRY; BACKBONE; electron transfer; energy transfer; fluorescence; helix; oligonucleotides |
| Subjects: | 500 Science > 540 Chemistry & allied sciences |
| Divisions: | Chemistry and Pharmacy > Institut für Organische Chemie |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 10 Jul 2019 13:25 |
| Last Modified: | 10 Jul 2019 13:25 |
| URI: | https://pred.uni-regensburg.de/id/eprint/5303 |
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