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- Title
A Tri‐state Fluorescent Switch with "Gated" Solid‐state Photochromism Induced by an External Force.
- Authors
Qian, Chen; Ma, Zhimin; Liu, Jianwei; Zhang, Xue; Wang, Shitao; Ma, Zhiyong
- Abstract
Mr. Chen Qian, Dr. Zhimin Ma, Mr. Jianwei Liu, Mrs. Xue Zhang, Prof. Shitao Wang and Prof. Zhiyong Ma. In this article, we report a newly designed molecule composed of a dihydroazulene (DHA) group and a phenothiazine (PTZ) moiety, which achieves aggregation‐induced emission enhancement (AIEE), mechanochromism and "gated" solid‐state photochromism upon stimulation by an external force. Grinding loosens intermolecular interactions in the crystal and causes a red‐shift of fluorescence from 570 nm to 600 nm. Meanwhile, the ring‐opening reaction of DHA unit is activated by grinding and a remarkable photochromism could be observed from the grinded powder. The reddish emission of the grinded powder peaked at 600 nm weakened gradually and finally became dark, and a new absorption band at 470 nm emerged in the absorption spectra. Time‐dependent density functional theory (TD‐DFT) calculation results reveal that the intramolecular intramolecular charge‐transfer (ICT) process is replaced by a locally excited (LE) emission on the DHA group, which leads to the quenching of fluorescence. Its impressive photochromic property inspired us to a simple but effective way to develop an encryption system which can let the correct information be displayed upon external stimulation.
- Subjects
PHOTOCHROMISM; TIME-dependent density functional theory; RING-opening reactions; ELECTRONIC spectra; FLUORESCENCE quenching; INTRAMOLECULAR forces
- Publication
Chemistry - An Asian Journal, 2021, Vol 16, Issue 22, p3713
- ISSN
1861-4728
- Publication type
Article
- DOI
10.1002/asia.202101002