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| A squaraine based fl uorescent probe for mercury ion via coordination induced deaggregation signaling |
| Shuang-Yong Lin, Hui-Jun Zhu, Wen-Jian Xu, Gui-Mei Wang, Nan-Yan Fu |
| Key Laboratory of Analysis and Detection for Food Safety, Ministry of Education & Fujian Provincial Key Laboratory of Analysis and Detection Technology for Food Safety, College of Chemistry and Chemical Engineering, and Department of Chemistry, Fuzhou University, Fuzhou 350108, China |
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Abstract Due to the high affinity between dithiocarbamate (DTC) and Hg2+, a fluorescent probe based on squaraine chromophore with DTC side arm for Hg2+ via coordination induced deaggregation signaling has been designed and synthesized. Squaraine has a high tendency to aggregate in aqueous solution, and such self-aggregation usually results in a dramatic absorption spectral broadening with fluorescence emission quenching. The combination of the DTC side arm of the probe with Hg2+ induces steric hindrance, leading to the deaggregation of the dye complex, companying with a fluorescence emission restoration. In EtOH-H2O (20:80, v/v) solution, this "turn on" fluorescent probe has high selectivity and sensitivity toward Hg2+ over other metal ions, and the limit of detection for Hg2+ was estimated as 2.19×10-8mol/L by 3σ/k.
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Received: 03 January 2014
Published: 02 May 2014
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| Fund: This work was financially supported by the National Science Foundation for Fostering Talents in Basic Research of the National Natural Science Foundation of China (No. J1103303), the National Natural Science Foundation of China (No. 20702005), the Fujian Provincial Department of Science and Technology, China (No. 2013Y0062), Funding (Type A) from Fujian Education Department, PR China (Nos. JA12038 and JA13043) and the Science and Technology Development Fund of Fuzhou University, China (No. 600902). |
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Corresponding Authors:
Nan-Yan Fu
E-mail: nanyan_fu@fzu.edu.cn
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