4.8 Article

Aromaticity-Enhanced pH-Responsive Electrochemiluminescence of Cyclopentadienols

期刊

ANALYTICAL CHEMISTRY
卷 94, 期 15, 页码 6036-6043

出版社

AMER CHEMICAL SOC
DOI: 10.1021/acs.analchem.2c00717

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资金

  1. Natural Science Foundation of China [21904106, 22174111, 22174110]
  2. industrial support plan of the Gansu Provincial Department of Education [2021cyzc-01]
  3. Open Fund of the State Key Laboratory of Elemento-Organic Chemistry [202004, 2020XBZG-XBQNXZ-A]
  4. Special Fund Project for Guiding Local Scientific and Technological Development by the Central Government [2020-2060503-17]

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By employing an enhanced aromaticity strategy, a series of cyclopentadienols with excellent AIE-ECL properties were synthesized. It was found that different substituents significantly influenced the ECL emission by affecting the characteristic absorption peak intensity ratio in UV-vis spectra and LUMO-HOMO energies. The cyclopentadienol with an electron-withdrawing fluorine substituent demonstrated the best ECL performance and showed a wide response range to pH.
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.

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