Supramolecular Oligourethane Gel with Multicolor Luminescence Controlled by Mechanically Sensitive Hydrogen-Bonding

被引:23
作者
Jiang, Nan [1 ]
Ruan, Shi-Hao [4 ]
Liu, Xing-Man [1 ]
Zhu, Dongxia [1 ]
Li, Bing [2 ]
Bryce, Martin R. [3 ]
机构
[1] Northeast Normal Univ, Key Lab Nanobiosensing & Nanobioanal Univ Jilin P, Fac Chem, Changchun 130024, Peoples R China
[2] Changchun Normal Univ, Coll Phys, Changchun 130032, Peoples R China
[3] Univ Durham, Dept Chem, Durham DH1 3LE, England
[4] Jilin Univ, State Key Lab Superhard Mat, Changchun 130012, Peoples R China
基金
英国工程与自然科学研究理事会; 中国国家自然科学基金;
关键词
AGGREGATION-INDUCED EMISSION; MECHANOCHROMIC LUMINESCENCE; POLYMER; MECHANOCHEMISTRY; POLYURETHANE; PRESSURE;
D O I
10.1021/acs.chemmater.0c01620
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
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.
引用
收藏
页码:5776 / 5784
页数:9
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