A Highly Selective and Sensitive Fluorescent Sensor for Copper(II) Ion Characterized by One Dichlorofluorescein Moiety and Two Azathia-Crown Ether
作者:Yuzhu Jiang、Zhong Huang、Huajun Dai、Lihua Wang、Liu Ying、Xingming Kou
DOI:10.14233/ajchem.2013.14722
日期:——
A new fluorescent sensor 1, which functionalized with one dichlorofluorescein moiety as fluorogenic signaling subunit and two azathia-crown ether macrocyclic as binding site was designed, synthesized and characterized. It was found that sensor 1 can selectively recognize Cu2+ by a remarkable emission quenching in DMSO-H2O (1:1, v/v), which was attributed to the 1:2 complex formation between 1 and Cu2+, while other ion including K+, Na+, Mg2+, Zn2+, Ba2+, Co2+, Ca2+, Fe2+, Fe3+, Pb2+, Pb2+, Ni2+ and Ag+ induced no or much small fluorescence changes. In addition, the sensor 1 exihibited a rapid, stable and linear response to Cu2+ in the concentration range from 5 × 10-7 to 1 × 10-5 mol L-1 with a detection limit as low as 8.7 × 10-8 mol L-1. Furthermore, the sensor 1 was applied to practical determination of Cu2+ in different water samples with satisfactory results.
一种新型荧光传感器1,通过引入二氯荧光素基团作为荧光报告单元和两个氮杂冠醚大环作为结合位点进行功能化设计、合成和表征。研究发现,传感器1在DMSO-H2O(1:1,v/v)中能选择性地识别Cu2+,表现为显著的荧光淬灭,这归因于1与Cu2+之间的1:2络合物形成,而其他离子如K+、Na+、Mg2+、Zn2+、Ba2+、Co2+、Ca2+、Fe2+、Fe3+、Pb2+、Ni2+和Ag+则导致无或极小的荧光变化。此外,传感器1对Cu2+表现出快速、稳定且线性的响应,浓度范围从5 × 10-7至1 × 10-5 mol L-1,检测限低至8.7 × 10-8 mol L-1。进一步地,传感器1被应用于实际水样中Cu2+的测定,结果令人满意。