南京大学郑佑轩团队报道了手性笼状碳硼烷的圆偏光和聚集诱导电化学发光。相关研究成果于2022年9月14日发表于国际一流学术期刊《德国应用化学》。

该文中，研究人员报道了具有咔唑发色团的手性at笼碳硼烷衍生物的结构，其发射圆极化发光（CPL）和聚集诱导电化学发光（AIECL）。通过调整碳硼烷衍生物上的取代基位置，获得了两种具有不同性质的手性发光分子Cb1和Cb2。在纯膜中，（R/S）-Cb1和（R/S）-Cb2对映体的光致发光不对称因子|gPL|分别高达6.24×10^-3和7.38×10^-2。Cb1在正戊烷中在434nm处显示深蓝色发射峰。

有趣的是，由于扭曲的分子内电荷转移效应，在不同极性的溶剂中观察到不同的荧光和CPL光谱，表明其在溶剂识别中的潜在用途。同时，Cb2显示出良好的AIECL性质、优异的ECL稳定性，可用于测定多巴胺浓度，表明其在生物学和诊断中的潜在应用。

附：英文原文

Title: Chiral-at Cage Carboranes for Circularly Polarized Luminescence and Aggregation-Induced Electrochemiluminescence

Author: Jingjing Tong, Yue Cao, Yi-Wen Zhang, Peng Wang, Xiang-Ji Liao, Weigang Zhang, Yi Wang, You-Xuan Zheng, Jun-Jie Zhu, Yi Pan

Issue&Volume: 2022-09-14

Abstract: Herein, we report the structures of chiral-at-cage carborane derivatives bearing carbazole chromophores that emit circularly polarized luminescence (CPL) and aggregation-induced electrochemiluminescence (AIECL). By adjusting the substituent positions on the carborane derivatives, two chiral luminescent molecules, Cb1 and Cb2, with different properties were obtained. The photoluminescence dissymmetry factors |gPL| of both (R/S)-Cb1 and (R/S)-Cb2 enantiomers in neat films were as high as 6.24 × 10-3  and 7.38×10-3, respectively. Cb1 showed a deep blue emission peak at 434 nm in  n-pentane. Interestingly, distinct fluorescence and CPL spectra were observed in solvents of different polarities due to the twisted intramolecular charge transfer effect, suggesting its potential use in solvent recognition. Meanwhile, Cb2 exhibited good AIECL property, excellent ECL stability and could be used for determining dopamine concentrations, suggesting its potential applications in biology and diagnosis.

DOI: 10.1002/anie.202209438

Source: https://onlinelibrary.wiley.com/doi/10.1002/anie.202209438