A Novel Chemosensor Based on Rhodamine Derivative for Colorimetric and Fluorometric Detection of Cu2+ in Aqueous Solution |
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Authors: | Yu Wang Hai-qiang Wu Jian-hua Sun Xiao-ya Liu Jing Luo Ming-qing Chen |
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Affiliation: | (1) School of Chemical and Material Engineering, Jiangnan University, 214122 Wuxi, People’s Republic of China; |
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Abstract: | A new rhodamine-based reversible chemosensor (2) was synthesized, which exhibits high sensitivity and selectivity for Cu2+ but no significant response toward other competitive metal ions in aqueous solution. Upon the addition of Cu2+, the spirolactam ring of 2 was opened and the solution color changed from colorless to red. Strangely, an unexpected fluorescence quenching was observed, which is contrary to the fluorescence turn-on of the most rhodamine-based chemosensors. The likely novel sensing mechanism has been proposed. |
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