Journal
DYES AND PIGMENTS
Volume 195, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.dyepig.2021.109708
Keywords
Multi-stimuli response; Salicylaldehyde schiff base; Mechanochromism; Thermochromism; Protonation effect; Discrimination of CHCl3
Funding
- Sichuan University of Science and Engineering [2015RC25]
- Research Grant for Graduate Student of Chongqing University of Arts and Sciences [M2020ME27]
- Key Laboratory of Green Chemistry of Sichuan Institutes of Higher Education [LZJ1807]
- Chemical Synthesis and Pollution Control Key Laboratory of Sichuan Province [CSPC 201908]
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In this study, a multi-stimuli-responsive compound DDHAC was presented, showing photophysical properties in solution and reversible mechanochromic and thermochromic behavior. The Et2N group endowed DDHAC with protonation capability, making it a unique optical probe for discriminating CHCl3 from organic solvents. The selectivity was attributed to the interaction of DPPTP with HCl gas from photodecomposition product of chloroform.
Multi-stimuli-responsive materials, which can show color/fluorescence change in response to external chemical or physical stimuli, have received increasing attention due to the capacities for facile realization of multifunctional sensing. Herein, we presented a Et2N-substituted salicylaldehyde Schiff base compound (DDHAC) with multi-stimuli-responsive behaviors. An investigation of the photophysical properties in solution demonstrated DDHAC was an excited-state intramolecular proton transfer (ESIPT) and aggregation-induced emission (AIE) active molecule. Owing to structural flexibility from salicylaldehyde Schiff base, the compound displayed reversible mechanochromic and thermochromic behavior, which were associated with the crystalline-to amorphous and crystalline-to-crystalline, respectively. Moreover, the Et2N group endowed DDHAC with the capability that response of protonation. Due to its protonation effect, DDHAC could serve as a unique optical probe for discriminating CHCl3 from organic solvents assisted by UV irradiation. The selectivity was attributed to the interaction of DPPTP with HCl gas from photodecomposition product of chloroform.
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