Phenothiazine electrophores immobilized on periodic mesoporous organosilicas by ion exchange
| Autor: | Björn Schäfgen, Werner R. Thiel, Annelies DeCuyper, Axel Schüssler, Stefan Ernst, Antonio J. Pierik, Thomas Müller, Adam Neuba, Dominique F. Bechtel, Hilla Khelwati |
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| Rok vydání: | 2019 |
| Předmět: |
Ion exchange
02 engineering and technology General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology Photochemistry 01 natural sciences Catalysis Fluorescence spectroscopy 0104 chemical sciences law.invention chemistry.chemical_compound Mesoporous organosilica chemistry law Desorption Phenothiazine Materials Chemistry Side chain Cyclic voltammetry 0210 nano-technology Electron paramagnetic resonance |
| Zdroj: | New Journal of Chemistry. 43:16396-16410 |
| ISSN: | 1369-9261 1144-0546 |
| Popis: | Two different phenothiazines carrying quaternary ammonium groups in the side chain have been synthesized and fully characterized. These compounds were immobilized by ion exchange on the surface of a periodic mesoporous organosilica (PMO) and a neat silica SBA-15 material bearing sulphonate groups covalently bound to the pore surface. The resulting porous and electrochromophoric materials were studied by means of solid state CP-MAS NMR, IR, UV/Vis and fluorescence spectroscopy, nitrogen adsorption/desorption measurements and cyclic voltammetry. Independent of the nature of the support, the colour of these materials changes to pink by irradiation with light, indicating the formation of phenothiazine radical cations. These species, which turned out to be highly stable even in the presence of atmospheric oxygen, were characterized by EPR spectroscopy. |
| Databáze: | OpenAIRE |
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