Design synthesis method and application of electrochemical luminophor based on covalent organic framework

Abstract

The invention discloses a design synthesis method and application of an electrochemical luminophor based on a covalent organic framework. The design synthesis method comprises the following steps: synthesizing an olefin-linked donor-acceptor completely conjugated covalent organic framework from an electron-deficient molecule 2,4,6-trimethylphenyl-1,3,5-triformonitrile and an electron-donating molecule tri-formyl-tribenzidine through condensation and cocrystallization; and coating the surface of a glassy carbon electrode with the covalent organic framework to prepare a modified electrode, and allowing an electron donor and an electron acceptor in the covalent organic framework to be separated and transferred under the action of an electric field, wherein a generated intramolecular electron transfer state activates the cathode electrochemiluminescence response of a non-electrochemiluminescence active monomer in a water-phase medium, and under the condition of not additionally adding a high-oxidability toxic co-reactant, high luminous efficiency is obtained. UO2<2+> can be selectively captured after further amido oximation, ECL signals are linearly enhanced, and accordingly, a signal-on type UO2<2+> electrochemical luminescence sensor is constructed, has the advantages of being wide in detection range, low in detection limit, good in selectivity and the like and can also be used for ultra-sensitive analysis of UO2<2+> in an environment water sample.

Description

technical field [0001] The invention belongs to the technical field of electrochemiluminescence, and in particular relates to a design synthesis method and application of an electrochemiluminescent body based on a covalent organic framework. Background technique [0002] Electrochemiluminescence (ECL) is a luminescent phenomenon based on high-energy electron transfer reactions of electrochemically generated substances. Because the reaction kinetics can be precisely controlled by controlling the applied potential in the absence of excitation light, the ECL method is more sensitive than other optical methods (Richter, M.M. Electrochemiluminescence (ECL). Chem. Rev. 2004, 104, 3003) . In addition, it requires small sample volume and simple instrument operation, which provides an advanced platform for biosensors, clinical analysis, environmental monitoring and other fields (Babamiri, B.; Bahari, D.; Salimi, A. Highly sensitive bioaffinity electrochemiluminescence sensors : rec...

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Problems solved by technology

Among them, the inductively coupled plasma mass spectrometry method can accurately quantify uranium with a low detection limit, but the sample pretreatment is time-consuming and laborious, and has high requirements for instruments, which hinders its application in the on-site detection of uranium (Wang, Z.; Pan, J.; Li, Q.; Zhou, Y.; Yang, S.; Xu, J.J.; Hua, D. Improved AIE-active probe with high sensitivity for accurate uranyl ion monitoring in the wild using portable electrochemiluminescence system for environmental applications. Adv. Funct. Mater .2020,30,2000220)

while UO 2 2+ Luminescent probes are low-cost, easy-to-use, and relatively simple and readily available tools, however, existing methods are still not sensitive enough to accurately monitor trace amounts of UO in the environment 2 2+

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