Liu Zhipeng, Liu Yi, Qi Fen, Yan Hui, Jiang Zhiyong, Chen Yuncong
College of Materials Science and Engineering, Nanjing Forestry University, 159 Longpan Road, Nanjing, 210073, P. R. China.
Institute of Advanced Materials (IAM), Nanjing Tech University (NanjingTech), 30 South Puzhu Road, Nanjing, 211816, P. R. China.
Chemistry. 2020 Nov 20;26(65):14963-14968. doi: 10.1002/chem.202002712. Epub 2020 Oct 19.
The generation of different thermodynamically (meta)stable states is crucial for the development of smart solid-state luminescent materials. However, the design of luminophores with tunable aggregation states is remaining a grand challenge. Herein, we present a family of mechanochromic luminophores with tunable metastable states, based on the dynamically controllable π-π stacking of the flexible π-conjugated structure of 2,5-diarylamino-terephthalates in the solid state. The experimental data revealed that both the kinetically controlled metastable state and thermodynamic controlled stable state can be generated via tuning the intermolecular interactions such as π-π stacking and hydrogen bonds. As a result, the highly sensitive mechano-stimuli response of these luminophores was successfully achieved.
生成不同的热力学（亚）稳定状态对于智能固态发光材料的发展至关重要。然而，设计具有可调聚集态的发光体仍然是一个巨大的挑战。在此，我们基于固态下2,5-二芳基氨基对苯二甲酸酯柔性π共轭结构的动态可控π-π堆积，展示了一族具有可调亚稳态的机械变色发光体。实验数据表明，通过调节分子间相互作用，如π-π堆积和氢键，可以产生动力学控制的亚稳态和热力学控制的稳定态。结果，成功实现了这些发光体对机械刺激的高灵敏度响应。
