Herein, aggregation-induced electrochemiluminescence (AIECL) of tetraphenylbenzosilole derivatives in an aqueous phase system with the participation of a co-reactant was systematically investigated for the first time. All organics that we studied exhibit excellent stability and dramatically enhanced electrochemiluminescence (ECL) and photoluminescence (PL) emission when the water fraction increases. The influence of substituents in the structure of tetraphenylbenzosilole derivatives on AIECL performance was proved by fluorescence, cyclic voltammetry, and related theoretical calculation. Among them, 2,3-bis(4-cyanophenyl)-1,1-diphenyl-benzosilole (TPBS-C) with strong electron-withdrawing cyano groups exhibits the best ECL behavior with the highest ECL efficiency (184.36%). The strongest ECL emission of TPBS-C not only stems from the aggregated molecules that restrict the intramolecular motion of peripheral phenyl groups, which inhibits the nonradiative transition, but also comes from the fact that TPBS-C has the lowest reduction potential, and twice the reduction process of TPBS-C occurs to produce more anion radicals (TPBS-C^·–). Significantly, the ECL sensor based on TPBS-C nanoaggregates exhibits excellent detection performance for toxic Cr(VI) with a wide linear range from 10^–12 to 10^–4 M and an extremely low detection limit of 0.83 pM. This work developed an efficient luminophore with unique AIECL properties and realized the ultrasensitive detection of Cr(VI) in the aqueous phase system.

中文翻译：

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四苯基铬超灵敏检测的水相系统中四苯并苯甲酚衍生物的聚集诱导电化学发光

在本文中，首次系统地研究了在共反应剂参与下的水相体系中四苯基苯甲硅烷衍生物的聚集诱导的电化学发光（AIECL）。当水含量增加时，我们研究的所有有机物均表现出出色的稳定性，并显着增强了电化学发光（ECL）和光致发光（PL）的发射。通过荧光，循环伏安法和相关的理论计算证明了四苯基苯甲硅烷衍生物结构中取代基对AIECL性能的影响。其中，具有强吸电子氰基的2,3-双（4-氰基苯基）-1,1-二苯基-苯并甲硅烷基（TPBS-C）表现出最佳的ECL行为，具有最高的ECL效率（184.36％）。^{· –}）。重要的是，基于TPBS-C纳米聚集体的ECL传感器对毒性Cr（VI）表现出出色的检测性能，线性范围从10 ^–12到10 ^–4 M，检测限极低，仅为0.83 pM。这项工作开发了一种具有独特AIECL特性的高效发光体，并实现了水相系统中Cr（VI）的超灵敏检测。