Journal
CHEMISTRY-A EUROPEAN JOURNAL
Volume 25, Issue 32, Pages 7726-7732Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.201900796
Keywords
ab initio calculations; azo compounds; isomerization; molecular switches; ultrafast spectroscopy
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Funding
- Ministerio de Economia y Competitividad (Spain) (MINECO/FEDER) [CTQ2015-65770-P, CTQ2015-69363-P]
- Deutsche Forschungsgemeinschaft [SFB 749]
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Azo dyes that combine electron-withdrawing thiazole/benzothiazole heterocycles and electron-donating amino groups within the very same covalent skeleton exhibit relaxation times for their thermal isomerization kinetics within milli- and microsecond timescales at room temperature. Notably, the thermal back reaction of the corresponding benzothiazolium and thiazolium salts occurred much faster, within the picosecond temporal domain. In fact, these new light-sensitive platforms are the first molecular azo derivatives capable of reversible switching between their trans and cis isomers in a subnanosecond timescale under ambient conditions. In addition, theoretical calculations revealed very low activation energies for the isomerization process, in accordance with the fast subnanosecond kinetics that were observed experimentally.
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