BAPTA类荧光探针的离子识别性能研究与结合机制分析

Research on Ion Detection Property and Recognition Mechanism of a BAPTA Fluorescent Probe

本文基于ICT机制设计荧光探针结构,以BAPTA母环作为识别基团、引入苯乙烯类发色团--苯并咪唑作为荧光发色团,通过光谱手段分析探针在水体系中的离子识别性能,结果表明探针对Zn^2+呈现荧光增强性响应,同时能够以荧光猝灭方式检测Cu^2+、Hg^2+。根据探针单晶结构,研究BAPTA受体中四羧基的离子包结孔隙,进而根据ICT机制及金属离子电子层排布等特性,分析探针对离子识别性能的差异及与离子结合等识别机制问题。

In this paper, the fluorescent probe was designed based on Intramolecular Charge Transfer (ICT) byincorporatingbenzimidazole as the fluorophore and BAPTA receptor. Spectral analyses indicated the probe’s increasing fluorescence response towards Zn^2+ and decreases to Cu^2+ and Hg^2+ in aqueous environment. Based on the probe’s single crystal structure, the porosity formed by four carboxylic chains for the recognition of metal ions in BAPTA receptor was studied. ICT mechanism and electron effect wereintroduced to explore actual polyamide-metal ions interactions and the combination mechanism of metal ions by the probe.