Key Laboratory of Bioelectrochemistry and Environmental Analysis of Gansu Province, College of Chemistry and Chemical Engineering, Northwest Normal University, Lanzhou 730070, People's Republic of China.
Anal Chem. 2022 Apr 19;94(15):6036-6043. doi: 10.1021/acs.analchem.2c00717. Epub 2022 Apr 6.
Due to significantly tackling the problems of aggregation-caused quenching and water insolubility, aggregation-induced emission electrochemiluminescence (AIE-ECL) has emerged as a research highlight in aqueous detection and sensing. Herein, we reported a series of cyclopentadienols featuring excellent AIE-ECL properties on the basis of an enhanced aromaticity strategy. In detail, substituents profoundly determined ECL emission by affecting the characteristic absorption peak intensity ratio in UV-vis spectra and lowest unoccupied molecular orbital (LUMO)-highest occupied molecular orbital (HOMO) energies. It was found that 1,2,3,4,5-pentafluorophenyl cyclopentadienol (PFCD) containing an electron-withdrawing fluorine substituent, the maximum R/B band ratio, and a smaller LUMO-HOMO band gap demonstrated the best ECL performance. Meanwhile, such an AIE-ECL system displayed a wide response range toward pH (4-12) with a good linear relationship. Our research not only enriched polycyclic aromatic hydrocarbon-based AIE-ECL systems but also established an efficient pH sensor in the aqueous phase.
由于显著解决了聚集引起的猝灭和水溶性问题，聚集诱导的发射电化学发光（AIE-ECL）已成为水相检测和传感领域的研究热点。在此，我们基于增强的芳香性策略，报道了一系列具有优异 AIE-ECL 性能的环戊二烯醇。具体而言，取代基通过影响紫外可见光谱中特征吸收峰强度比和最低未占据分子轨道（LUMO）-最高占据分子轨道（HOMO）能量，深刻地决定了 ECL 发射。结果表明，含有吸电子氟取代基的 1,2,3,4,5-五氟苯基环戊二烯醇（PFCD），最大 R/B 带比值和较小的 LUMO-HOMO 能带隙表现出最佳的 ECL 性能。同时，这种 AIE-ECL 体系对 pH（4-12）具有较宽的响应范围，呈良好的线性关系。我们的研究不仅丰富了基于多环芳烃的 AIE-ECL 体系，而且在水相建立了一种有效的 pH 传感器。
