| Autor: |
Mikhail A. Filatov, Nikita A. Durandin, Jussi Isokuortti, Elina Vuorimaa-Laukkanen, Zafar Ahmed, Andrey Turshatov, Timo Laaksonen, Arri Priimagi, Kim Kuntze, Matti Virkki |
| Rok vydání: |
2021 |
| Předmět: |
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| DOI: |
10.26434/chemrxiv.14134595 |
| Popis: |
Designing azobenzene photoswitches capable of selective and efficient photoisomerization by long wavelength excitation is a long-standing challenge. Indirect excitation can expand the properties of the photoswitching system beyond the intrinsic limits of azobenzenes. Herein, a rapid Z-to-E isomerization of two ortho-functionalized azobenzenes with near-unity photoconversion was facilitated via triplet energy transfer upon red and near-infrared (up to 770 nm) excitation of porphyrin photosensitizers in catalytic micromolar concentrations. Our results indicate that the whole process of triplet-sensitized isomerization is strongly entropy-driven. This ensures efficient Z-to-E photoswitching even when the azobenzene triplet energy is considerably higher (>200 meV) than for the sensitizer, which is the key for the expansion of excitation wavelengths into the near-infrared spectral range. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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