期刊
DYES AND PIGMENTS
卷 190, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.dyepig.2021.109311
关键词
Multicolor mechanochromism; Aggregation-induced emission enhancement; Molecular conformation; Intermolecular interaction
资金
- National Natural Science Foundation of China [21774007, 51809129]
- Beijing Natural Science Foundation [2202043]
- Fundamental Research Funds for the Central Universities [PT1811]
PZ-BZ, a twisted D-?-A type molecule composed of phenothiazine, 1,4-phenylene unit, and benzothiazole, exhibits multicolor mechanochromic behavior with aggregation-induced emission enhancement properties. Crushing and grinding experiments on the PZ-BZ single crystal show changes in emission color, providing insights into the molecular mechanism of multicolor mechanochromism.
Mechanochromic luminescent (MCL) materials have attracted great attention in the fields of sensing, memory chips, and anti-counterfeiting. However, most MCL materials only display a two-color change and it is challenging to achieve multicolor mechanochromism with a single molecule. Herein, we reported a twisted D-?-A type molecule (PZ-BZ) composed of a phenothiazine (donor), 1,4-phenylene unit (?), and benzothiazole (acceptor). PZ-BZ exhibits intramolecular charge transfer and aggregation-induced emission enhancement properties. Additionally, the multicolor mechanochromic behaviour of PZ-BZ single crystal is observed. The original crystal of PZ-BZ emits cyan fluorescence (470 nm). When crushed, it exhibits blue-shifted emission (455 nm) due to the destruction of intermolecular interactions. Further grinding induces conformation planarization, resulting in large red-shifted fluorescence (503 nm). This study provides a deep insight into the molecular mechanism of multicolor mechanochromism through molecular interaction and conformation modulations.
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