A building-block design for enhanced visible-light switching of diarylethenes

Zhiwei Zhang, Wenhui Wang, Peipei Jin, Jiadan Xue, Lu Sun, Jinhai Huang, Junji Zhang () and He Tian
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Zhiwei Zhang: East China University of Science & Technology
Wenhui Wang: East China University of Science & Technology
Peipei Jin: Zhejiang Sci-Tech University
Jiadan Xue: Zhejiang Sci-Tech University
Lu Sun: Nankai University
Jinhai Huang: East China University of Science & Technology
Junji Zhang: East China University of Science & Technology
He Tian: East China University of Science & Technology

Nature Communications, 2019, vol. 10, issue 1, 1-9

Abstract: Abstract Current development of light-responsive materials and technologies imposes an urgent demand on visible-light photoswitching on account of its mild excitation with high penetration ability and low photo-toxicity. However, complicated molecular design and laborious synthesis are often required for visible-light photoswitch, especially for diarylethenes. Worse still, a dilemma is encountered as the visible-light excitation of the diarylethene is often achieved at the expense of photochromic performances. To tackle these setbacks, we introduce a building-block design strategy to achieve all-visible-light photochromism with the triplet-sensitization mechanism. The simply designed diarylethene system is constructed by employing a sensitizer building-block with narrow singlet-triplet energy gap (ΔEST) to a diarylethene building-block. A significant improvement on the photochromic efficiency is obtained as well as an enhanced photo-fatigue resistance over those under UV irradiation. The balance between the visible-light excitation and decent photochromism is thus realized, promoting a guiding principle for the visible-light photochromism.

Date: 2019
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DOI: 10.1038/s41467-019-12302-6

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