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Mechanistic Insights into the Triplet Sensitized Photochromism of Diarylethenes.


ABSTRACT: Operating photoswitchable molecules repetitively and reliably is crucial for most of their applications, in particular in (opto)electronic devices, and related to reversibility and fatigue resistance, which both critically depend on the photoisomerization mechanism defined by the substitution pattern. Two diarylethene photoswitches bearing biacetyl triplet sensitizers either at the periphery or at the core were investigated using both stationary as well as transient UV/Vis absorption spectroscopy ranging from the femtosecond to the microsecond time scale. The diarylethene with two biacetyl moieties at the periphery is switching predominantly from the triplet excited state, giving rise to an enhanced fatigue resistance. In contrast, the diarylethene bearing one diketone at the photoreactive inner carbon atom cyclizes from the singlet excited state and shows significantly higher quantum yields for both cyclization and cycloreversion.

SUBMITTER: Fredrich S 

PROVIDER: S-EPMC7318355 | biostudies-literature | 2020 Jun

REPOSITORIES: biostudies-literature

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Mechanistic Insights into the Triplet Sensitized Photochromism of Diarylethenes.

Fredrich Sebastian S   Morack Tobias T   Sliwa Michel M   Hecht Stefan S  

Chemistry (Weinheim an der Bergstrasse, Germany) 20200526 34


Operating photoswitchable molecules repetitively and reliably is crucial for most of their applications, in particular in (opto)electronic devices, and related to reversibility and fatigue resistance, which both critically depend on the photoisomerization mechanism defined by the substitution pattern. Two diarylethene photoswitches bearing biacetyl triplet sensitizers either at the periphery or at the core were investigated using both stationary as well as transient UV/Vis absorption spectroscop  ...[more]

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