Zou Junjian, Fang Yuanyuan, Shen Yunxia, Xia Yang, Wang Kai, Zhang Cheng, Zhang Yujian
Key Laboratory of the Ministry of Education for Advanced Catalysis Materials, Department of Chemistry, Zhejiang Normal University, Yingbin Road No.688, Jinhua, 321004, P. R. China.
College of Chemical Engineering, Zhejiang University of Technology, Chaowang Road NO. 18, Hangzhou, 310014, P. R. China.
Angew Chem Int Ed Engl. 2022 Sep 12;61(37):e202207426. doi: 10.1002/anie.202207426. Epub 2022 Aug 3.
Achieving blueshifted and enhanced emission from purely organic luminophors remains a major challenge. Herein, we report a tetracoordinate boron complex with polymorphism (Y-phase and O-phase)-dependent luminescence. Impressively, the Y-phase crystals exhibited rare piezochromic luminescent properties such as pressure-induced blue-shifted and enhanced emission. The results of theoretical and experimental tests demonstrated that this phenomenon results from the cooperative effect between the restriction of intramolecular motions and alterable charge transfer (CT) behavior during compression. This work provides an ideal model to investigate the optoelectronic properties of boron complexes. Importantly, manipulating the CT behavior through the electrophilicity of boron atoms may become a new principle for the design of piezochromic materials with blueshifted and enhanced emission.
实现纯有机发光体的蓝移和增强发射仍然是一个重大挑战。在此，我们报道了一种具有多晶型（Y相和O相）依赖性发光的四配位硼配合物。令人印象深刻的是，Y相晶体表现出罕见的压致变色发光特性，如压力诱导的蓝移和增强发射。理论和实验测试结果表明，这种现象是由分子内运动受限和压缩过程中可变的电荷转移（CT）行为之间的协同效应引起的。这项工作为研究硼配合物的光电性质提供了一个理想模型。重要的是，通过硼原子的亲电性来操纵CT行为可能成为设计具有蓝移和增强发射的压致变色材料的新原理。
