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

Slavov, ChavdarChavdarSlavovYang, ChongChongYangHeindl, Andreas HansAndreas HansHeindlStauch, TimTimStauchWegner, Hermann A.Hermann A.WegnerDreuw, AndreasAndreasDreuwWachtveitl, JosefJosefWachtveitl2025-02-272025-02-272018-07-311948-7185https://media.suub.uni-bremen.de/handle/elib/876810.26092/elib/3677Continuous 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.enAlle Rechte vorbehaltenAlle Rechte vorbehaltenAbsorptionIsomerizationMolecular structurePhotoisomerizationUltrafast phenomena540Twist and Return−Induced Ring Strain Triggers Quick Relaxation of a (Z)-Stabilized CyclobisazobenzeneArtikel/Aufsatzurn:nbn:de:gbv:46-elib87683