Jiang Nan, Ruan Shi-Hao, Liu Xing-Man, Zhu Dongxia, Li Bing, Bryce Martin R
Key Laboratory of Nanobiosensing and Nanobioanalysis at Universities of Jilin Province, Faculty of Chemistry, Northeast Normal University, Renmin Street No. 5268, Changchun 130024, China.
State Key Laboratory of Superhard Materials, Jilin University, Changchun 130012, P. R. China.
Chem Mater. 2020 Jul 14;32(13):5776-5784. doi: 10.1021/acs.chemmater.0c01620. Epub 2020 Jun 30.
We report a new type of mechanically sensitive multicolor luminescent oligourethane 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 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 H-bonding. The multifunctional and multicolored mechanochromism of the 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.
我们报道了一种新型的机械敏感多色发光低聚氨基甲酸酯凝胶（）。通过改变氢键强度可以控制低聚链的构象。低聚物的光学性质高度依赖于构象，这些构象会因机械应力和相变而变化。该设计依赖于引入单一的机械发色团——金精三羧酸，其具有螺旋桨状、空间拥挤且高度扭曲的构象，以及三个羧基的存在，这提供了多方向的氢键结合机会。引入二甲基亚砜（DMSO）作为额外的氢键受体分子会导致一种粘性的（此处原文似乎不完整），由于基质内链构象的变化，该粘性物质呈现多发射颜色，而这种变化是由不同强度的氢键诱导的。构象可以通过机械力或温度进行调节，这两者都会影响氢键结合。该凝胶的多功能和多色机械变色特性在传感应用中具有巨大潜力。这些结果代表了在理解软材料中多色现象的机制以及先进智能材料的分子设计方面迈出的重要一步。
