Twist and Return−Induced Ring Strain Triggers Quick Relaxation of a (Z)‑Stabilized Cyclobisazobenzene

Continuous irradiation of the thermodynamically stable (Z,Z)-cyclobisazobenzene does not lead to accumulation of a (Z,E) or (E,E) isomer as one might expect. Our combined experimental and computational investigation reveals that Z → E photoisomerization still takes place on an ultrafast time scale b...

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Published inThe journal of physical chemistry letters Vol. 9; no. 16; pp. 4776 - 4781
Main Authors Slavov, Chavdar, Yang, Chong, Heindl, Andreas H, Stauch, Tim, Wegner, Hermann A, Dreuw, Andreas, Wachtveitl, Josef
Format Journal Article
LanguageEnglish
Published United States American Chemical Society 16.08.2018
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Summary:Continuous irradiation of the thermodynamically stable (Z,Z)-cyclobisazobenzene does not lead to accumulation of a (Z,E) or (E,E) isomer as one might expect. Our combined experimental and computational investigation reveals that Z → E photoisomerization still takes place on an ultrafast time scale but induces large ring strain in the macrocycle, which leads to a very fast thermal back-isomerization, preventing photostationary accumulation of (E)-isomers.
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ISSN:1948-7185
1948-7185
DOI:10.1021/acs.jpclett.8b02159