Suenaga Kazumasa, Ito Shunichiro, Tanaka Kazuo, Chujo Yoshiki
Department of Polymer Chemistry, Graduate School of Engineering, Kyoto University, Katsura, Nishikyo-ku, Kyoto 615-8510, Japan.
Molecules. 2022 May 26;27(11):3438. doi: 10.3390/molecules27113438.
We report development of luminescent ionic salts consisting of the boron ketoiminate structure, which is one of the robust skeletons for expressing aggregation-induced emission (AIE) properties. From the formation of the boron-centered spiro structure with the ketoiminate ligands, we obtained stable ionic salts with variable anions. Since the ionic salts show s below 100 °C, it was shown that these salts can be classified as an ionic liquid. By using PF anion, the single crystal-which is applicable for X-ray crystallography-was obtained. According to the optical measurements, it was proposed that electronic interaction should occur through the boron center. Moreover, intense emission was observed both in solution and solid. Finally, we demonstrated that the emission color of the PF salt was altered from crystal to amorphous by adding mechanical forces. Based on boron complexation and intrinsic solid-state luminescent characters, we achieved obtainment of emissive ionic materials with environmental responsivity.
我们报道了由硼酮亚胺结构组成的发光离子盐的开发，硼酮亚胺结构是表达聚集诱导发光（AIE）特性的稳健骨架之一。通过与酮亚胺配体形成以硼为中心的螺环结构，我们获得了具有可变阴离子的稳定离子盐。由于离子盐的熔点低于100°C，表明这些盐可归类为离子液体。通过使用PF阴离子，获得了适用于X射线晶体学的单晶。根据光学测量，提出电子相互作用应通过硼中心发生。此外，在溶液和固体中均观察到强烈的发射。最后，我们证明了通过施加机械力，PF盐的发射颜色从晶体变为非晶态。基于硼络合和固有的固态发光特性，我们实现了具有环境响应性的发光离子材料的制备。
