Journal
JOURNAL OF FLUORESCENCE
Volume 27, Issue 2, Pages 629-633Publisher
SPRINGER/PLENUM PUBLISHERS
DOI: 10.1007/s10895-016-1991-0
Keywords
Zinc ion; Rhodamine; Coumarin; Fluorescence
Funding
- National Natural Science Foundation of China [21172127]
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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 CH3CN. 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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