A highly Selective Fluorescent Chemosensor for Zn²⁺Based on the Rhodamine Derivative Incorporating Coumarin Group

• Key Words:Zinc;Fluorescence - Metal ions - Metals - Transition metal compounds - Transition metals;Coumarin - Coumarin derivatives - Fluorescence sensing - Fluorescent chemosensor - Fluorescent intensity - Limit of detection - Rhodamine - Zinc ions
• Abstract: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 CH<inf>3</inf>CN. Significantly, the rodamine-coumarin derivative exhibited highly selective and sensitive recognition toward Zn²⁺with a limit of detection (LOD) down to 10^&minus;9&nbsp;M. Upon addition of Zn²⁺, remarkable fluorescent intensities enhanced and also clear color changed from colorless to pink. The Job&rsquo;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 &ldquo;naked-eye&rdquo; detection of Zn²⁺. &copy; 2016, Springer Science+Business Media New York.
• Volume:27
• Issue:2
• Translation or Not:no