Solvent-dependent chromogenic sensing for Cu and fluorogenic sensing for Zn and Al: a multifunctional chemosensor with dual-mode |
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| Authors: | Gyeong Jin Park Dae Yul Park Kyung-Min Park Youngmee Kim Sung-Jin Kim Pahn-Shick Chang Cheal Kim |
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| Institution: | 1. Department of Fine Chemistry and Department of Interdisciplinary Bio IT Materials, Seoul National University of Science and Technology, Seoul 139-743, Republic of Korea;2. Department of Agricultural Biotechnology, Center for Food and Bioconvergence, and Research Institute of Agriculture and Life Sciences, Seoul National University, Seoul 151-742, Republic of Korea;3. Department of Chemistry and Nano Science, Ewha Womans University, Seoul 120-750, Republic of Korea |
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| Abstract: | A new multifunctional chemosensor 1 was synthesized and characterized by spectroscopic tools along with a single crystal X-ray crystallography. It can exhibit selective recognition responses toward Cu2+, Zn2+ and Al3+ in different solvent systems with bimodal methods (colorimetric and fluorescence). This sensor 1 detected Cu2+ ions through a distinct color change from colorless to yellow in aqueous solution. Interestingly, the receptor 1 was found to be reversible by EDTA. The detection limit (11 μM) of 1 for Cu2+ is much lower than WHO guideline (30 μM) in drinking water. In addition, the sensor 1 showed significant fluorescence enhancements in the presence of Zn2+ ion and Al3+ ion in two different organic solvents (DMF and MeCN), respectively. The binding modes of the three complexes were determined to be a 1:1 complexation stoichiometry through Job plot, ESI-mass spectrometry analysis, and 1H NMR titration. |
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| Keywords: | Copper ion Zinc ion Aluminum ion Colorimetric Fluorescent Reversible |
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