Selective detection of Zn^(2+) and Cd^(2+) ions in water using a host-guest complex between chromone and Q[7]  

作　　者：Zhishu Zeng Yunqian Zhang Xiaodong Zhang Guangyan Luo Jun Xie Zhu Tao Qianjun Zhang 

机构地区：[1]Key Laboratory of Macrocyclic and Supramolecular Chemistry of Guizhou Province,Guizhou University,Guiyang 550025,China

出　　处：《Chinese Chemical Letters》2021年第8期2572-2576,共5页中国化学快报（英文版）

基　　金：support from the Science and Technology Support Plan of Guizhou Province [Guizhou Science and Technology Cooperation Support (2020) 4Y218]。

摘　　要：In this paper,the host-guest interaction of cucurbit[7]uril(Q[7]) and chromone(CMO) has been developed as a fluorescent probe for the highly selective detection of Zn2+ and Cd^(2+) in water based on a chelation-enhanced fluorescence(CHEF) mechanism.There was a good linear relationship between the fluorescence intensity of the CMO@Q[7] probe and the concentration of Zn^(2+ )or Cd^(2+) in the range of 0-3.0×10^(-5) mol/L and the detection limit for Zn^(2+) and Cd2+ was found to be 2.03×10^(-6) mol/L and 1.89×10^(-6)mol/L,respectively.The X-ray crystal structure indicated that different coordination fashions were triggered by Zn^(2+) and Cd^(2+ )in the CMO@Q[7] complexes,respectively.However,both metal ions coordinated with the carbonyl oxygen of CMO,which was encapsulated in the cavity of Q[7],thus leading to the enhancement of recognition fluorescence emission of CMO.

关 键 词：CHROMONE uril Host-guest interaction Selective detection Zn^(2+)and Cd^(2+) 

分 类 号：X832[环境科学与工程—环境工程] O657.3[理学—分析化学]