Wolff, Christiane and Kind, Jonas and Schenderlein, Helge and Bartling, Hanna and Feldmeier, Christian and Gschwind, Ruth M. and Biesalski, Markus and Thiele, Christina M. (2016) Studies of a photochromic model system using NMR with ex-situ and in-situ irradiation devices. MAGNETIC RESONANCE IN CHEMISTRY, 54 (6). pp. 485-491. ISSN 0749-1581, 1097-458X
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The switching behavior of a photochromic model system was investigated in detail via NMR spectroscopy in order to improve understanding of the compound itself and to provide ways to obtain insights into composition trends of a photo switchable (polymeric) material containing spiropyran/merocyanine units. In addition to the classical irradiation performed outside the magnet (ex-situ), a device for irradiation inside the NMR spectrometer (in-situ) was tested. Both setups are introduced, their advantages and disadvantages as well as their limits are described and the setup for future investigations of photochromic materials is suggested. The influence of different sample concentrations, irradiation procedures, and light intensities on the model system was examined as well as the dependence on solvent, temperature, and irradiation wavelengths. Using the recently published LED illumination device, it was even possible to record two-dimensional spectra on this model system with rather short half-life (7 min in DMSO). This way C-13 chemical shifts of the merocyanine form were obtained, which were unknown before. Copyright (C) 2016 John Wiley & Sons, Ltd.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | SPECTROSCOPY; ILLUMINATION; SPIROPYRANS; SWITCHES; SENSORS; photochromism; spiropyran; merocyanine; LED; illumination device; NMR; UV/VIS |
| Subjects: | 500 Science > 540 Chemistry & allied sciences |
| Divisions: | Chemistry and Pharmacy > Institut für Organische Chemie > Arbeitskreis Prof. Dr. Ruth Gschwind |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 22 Mar 2019 09:17 |
| Last Modified: | 22 Mar 2019 09:17 |
| URI: | https://pred.uni-regensburg.de/id/eprint/2817 |
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