Studies of a photochromic model system using NMR withex-situandin-situirradiation devices
| Autor: | Markus Biesalski, Christiane Wolff, Helge Schenderlein, Christina M. Thiele, Jonas Kind, Christian Feldmeier, Ruth M. Gschwind, Hanna Bartling |
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| Rok vydání: | 2016 |
| Předmět: |
Spiropyran
Spectrometer 010405 organic chemistry Chemical shift General Chemistry Nuclear magnetic resonance spectroscopy 010402 general chemistry Photochemistry 01 natural sciences 0104 chemical sciences Photochromism chemistry.chemical_compound Ultraviolet visible spectroscopy chemistry General Materials Science Merocyanine Irradiation |
| Zdroj: | Magnetic Resonance in Chemistry. 54:485-491 |
| ISSN: | 0749-1581 |
| DOI: | 10.1002/mrc.4403 |
| Popis: | 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 (13) C chemical shifts of the merocyanine form were obtained, which were unknown before. Copyright © 2016 John Wiley & Sons, Ltd. |
| Databáze: | OpenAIRE |
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