Copper Complex Based Chemosensor which Could Colorimetrically Detect CN- in Water with Specific Selectivity and High Sensitivity

doi:10.6023/A13060614

Acta Chimica Sinica ›› 2013, Vol. 71 ›› Issue (11): 1516-1520.DOI: 10.6023/A13060614 Previous Articles Next Articles

Article

含水介质中高选择性比色识别氰根离子的配合物型传感器分子

林奇, 朱鑫, 陈佩, 符永鹏, 张有明, 魏太保

西北师范大学化学化工学院生态环境相关高分子材料教育部重点实验室甘肃省高分子材料重点实验室兰州 730070

投稿日期:2013-06-09 发布日期:2013-07-22
通讯作者: 魏太保 E-mail:weitaibao@126.com
基金资助:
项目受国家自然科学基金(Nos. 21064006, 21161018和21262032)、甘肃省自然科学基金(No. 1010RJZA018)、教育部长江学者和创新团队发展计划(IRT1177)资助.

Copper Complex Based Chemosensor which Could Colorimetrically Detect CN^- in Water with Specific Selectivity and High Sensitivity

Lin Qi, Zhu Xin, Chen Pei, Fu Yongpeng, Zhang Youming, Wei Taibao

Key Laboratory of Polymer Materials of Gansu Province, Key Laboratory of Eco-Environment-Related Polymer Materials Ministry of Education, College of Chemistry and Chemical Engineering, Northwest Normal University, Lanzhou 730070

Received:2013-06-09 Published:2013-07-22
Supported by:
Project supported by the National Natural Science Foundation of China (Nos. 21064006, 21161018 and 21262032), the Natural Science Foundation of Gansu Province (No. 1010RJZA018) and the Program for Changjiang Scholars and Innovative Research Team in University of Ministry of Education of China (IRT1177).

1. Copper Complex Based Chemosensor which Could Colorimetrically Detect CN^- in Water with Specific Selectivity and High Sensitivity.PDF(103KB)

Abstract

Owing to CN^- could firmly bind copper(Ⅱ) via coordinate bonds, a competitive coordination mechanism based colorimetric chemosensor CuL₂ was designed and synthesized. We carried out a series of CN^- recognition research based on this work. As a result, chemosensor CuL₂ could colorimetrically detect CN^- in water solution with specific selectivity and high sensitivity. CuL₂ can be utilized as a new colorimetric chemosensor for detection of cyanide at neutral pH in aqueous condition. Upon the addition of cyanide water solution to the DMSO/H₂O (V:V=3:1) HEPES buffered solution (pH=7.0) of chemosensor CuL₂, the green color of chemosensor CuL₂ faded to colorless immediately, in the corresponding UV-vis spectra, the absorption at 446 nm disappeared. The detection limits were 8.0×10^-6 and 4.0×10^-7 mol/L of CN^- using the visual color changes and UV-vis changes respectively, which is lower than the WHO guideline of 1.9 μmol·L^-1. Other anions such as F^-, Cl^-, Br^-, I^-, AcO^-, HSO₄^-, ClO₄^-, N₃^-, SO₄^2-, NO₃^- and SCN^- had no influence on the probing behavior of CuL₂ toward cyanide. The CuL₂ complex showed a highly selective and sensitive response toward cyanide by the complexation between the Cu²⁺ and CN^-. The process can be monitored by UV-vis spectral changes as well as a visual color change. The good selectivity and high sensitivity of the complex CuL₂ toward cyanide make CuL₂ a promising candidate in practical applications as a good cyanide probe. Considering the simplicity of the analysis and low cost of the starting materials in the present system, this new method may be provided an useful potential candidate of colorimetric chemosensor for determination of cyanide in a variety of biological and environmental systems. Test strips based on CuL₂ were fabricated, when different anion solutions were added to the test strips respectively, only the addition of CN^- could induced an obviously color changes, the detection limits of the test strips for CN^- is 8.0×10^-5mol/L. This test strips could act as a convenient and efficient CN^- test kit.

Key words: cyanide ion, colorimetric recognition, complex, thiourea, copper(Ⅱ) ion

Cite this article

Lin Qi, Zhu Xin, Chen Pei, Fu Yongpeng, Zhang Youming, Wei Taibao. Copper Complex Based Chemosensor which Could Colorimetrically Detect CN^- in Water with Specific Selectivity and High Sensitivity[J]. Acta Chimica Sinica, 2013, 71(11): 1516-1520.

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含水介质中高选择性比色识别氰根离子的配合物型传感器分子

Copper Complex Based Chemosensor which Could Colorimetrically Detect CN^- in Water with Specific Selectivity and High Sensitivity

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