期刊
CHEMISTRY OF MATERIALS
卷 32, 期 13, 页码 5776-5784出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.chemmater.0c01620
关键词
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资金
- NSFC [51473028]
- key scientific and technological project of Jilin province [20150204011GX, 20160307016GX, 20190701010GH]
- Development and Reform Commission of Jilin province [20160058, 2020C035-5]
- National Natural Science Foundation of China [11404036]
- 13th Five-year Planning Project of Jilin Provincial Education Department Foundation [20190504]
- EPSRC [EL/L02621X/1]
We report a new type of mechanically sensitive multicolor luminescent oligourethane gel (OUA-gel). The conformation of the oligomeric chains can be controlled by changing the strength of hydrogen bonds. The optical properties of the oligomers are highly dependent on the conformations which vary in response to mechanical stresses and phase transitions. The design relies on the introduction of a single mechanical chromophore, aurintricarboxylic acid, with propeller-like, spatially crowded, and highly twisted conformations, and the presence of three carboxyl groups, which provide multidirectional hydrogen-bonding opportunities. Introducing dimethylsulfoxide (DMSO) as an additional H-bond acceptor molecule leads to a viscous OUA-gel which exhibits multiemission colors because of changes in the chain conformation within the matrix, which are induced by different strengths of H bonds. The conformation can be adjusted by mechanical force or temperature, both of which influence the Hbonding. The multifunctional and multicolored mechanochromism of the OUA-gel has great promise in sensing applications. The results represent a substantial step toward understanding the mechanism of polychromism in soft materials and the molecular design of advanced smart materials.
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