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A highly Selective Fluorescent Chemosensor for Zn 2+ Based on the Rhodamine Derivative Incorporating Coumarin Group.

A coumarin-appended rhodamine derivative was prepared by reacting rhodamine hydrazide and coumarin-3-carboxylic acid, which fluorescence sensing behavior toward Zn2+ against other metal ions was investigated in CH3 CN. Significantly, the rodamine-coumarin derivative exhibited highly selective and sensitive recognition toward Zn2+ with a limit of detection (LOD) down to 10-9  M. Upon addition of Zn2+ , remarkable fluorescent intensities enhanced and also clear color changed from colorless to pink. The Job's plot indicated the formation of 1:1 complex between the rhodamine-coumarin derivative and Zn2+ . The presence of common coexisting alkali, alkaline earth, and transition metal ions showed small or no interference with the detection of Zn2+ . The conjugate dye could be used for "naked-eye" detection of Zn2+ .

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