基于N-(2-羧甲基)苯并氮杂-15-冠-5的新型荧光探针对Cu2+的敏感和选择性测定

IF 0.7 Q4 CHEMISTRY, ANALYTICAL
A. Yegorova, Yu. V. Skrypynets, I. Leonenko, D. Aleksandrova, T. Kirichenko, S. S. Basok, C. Kulygina
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引用次数: 0

摘要

铜被广泛使用,因此它是一种污染金属。开发高灵敏度、选择性测定铜的探针具有重要意义。苯并杂氮-15-冠-5衍生物被用作荧光传感体系,并证明了其优异的光谱特性。杂环单元的“N”、“O”原子作为识别铜离子的结合位点。建立了一种简便、灵敏的荧光测定Cu2+离子的新方法,并对该探针的分析特性进行了评价。在含乌洛托碱缓冲液(pH 7.5)的乙醇/水(4:6,v/v)混合溶剂中,Cu2+离子在λex = 274 nm和λem = 308 nm处显著猝灭N-(2-羧甲基)苯并杂氮-15-冠-5 (Cr)的荧光强度。该探头具有很高的光稳定性。在最佳条件下,荧光猝灭强度取决于Cu2+离子浓度在1.70 × 10-6 ~ 2.38 × 10-4 М范围内,检出限为0.56 μМ。本方法用于饮用水中Cu2+离子的测定。铜(II)存在时的猝灭效应可以解释为螯合作用终止了分子内电荷从螯合中心转移到分子芳香族部分的过程。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
A New Fluorescent Probe Based on N-(2-carboxymethyl)benzoaza-15-crown-5 for Sensitive and Selective Determination of Cu2+
Copper is widely used and therefore it is a pollutant metal. It is important to develop probes that can selectively determine copper with high sensitivity. The benzoaza-15-crown-5 derivatives are used as fluorescence sensing systems and excellent spectroscopic properties are demonstrated. The “N”, “O” atoms of the heterocyclic unit act as binding sites for recognizing copper ions. A new, simple, sensitive fluorescence method for the determination of Cu2+ ions was developed and analytical characteristics of the proposed probe were estimated. The Cu2+ ions can significantly quench the fluorescence intensity of N-(2-carboxymethyl)benzoaza-15-crown-5 (Cr) in ethanol/H2O (4:6, v/v) solvent mix containing urotropine buffer (pH 7.5) at λex = 274 nm and λem = 308 nm. The probe has high photostability. Under optimal conditions, the quenching of fluorescence intensity depends on the concentration of Cu2+ ions in the range of 1.70 × 10-6 - 2.38 × 10-4 М, detection limit was 0.56 μМ. This method was applied for the determination of Cu2+ ions in drinking water. The quenching effect in the presence of copper (II) can be explained by the termination of intramolecular charge transfer from the chelate center to the aromatic part of the molecule due to chelation.
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来源期刊
CiteScore
1.00
自引率
14.30%
发文量
12
期刊介绍: The journal "Methods and objects of chemical analysis" is peer-review journal and publishes original articles of theoretical and experimental analysis on topical issues and bio-analytical chemistry, chemical and pharmaceutical analysis, as well as chemical metrology. Submitted works shall cover the results of completed studies and shall make scientific contributions to the relevant area of expertise. The journal publishes review articles, research articles and articles related to latest developments of analytical instrumentations.
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