Journal
SENSORS AND ACTUATORS B-CHEMICAL
Volume 203, Issue -, Pages 550-556Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2014.07.017
Keywords
Fluorescent sensor; Rhodamine; Chromone; Al3+; Zn2+; FRET
Funding
- National Natural Science Foundation of China [81171337]
- Gansu NSF [1308RJZA115]
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A new fluorescent probe, which contains rhodamine and chromone moieties, was designed and synthesized for selective recognition Al3+ and Zn2+. The sensor showed immediate responses toward Al3+ and Zn2+ in different systems. The sensor exhibited highly selective and sensitive off-on fluorescent responses toward Al3+ based on the ring-opening mechanism of the rhodamine spirolactam in an acetonitrile: water solution (excitation 500 nm and emission 550 nm). Whereas, in an ethanol:water solution, the sensor showed a significant fluorescent enhancement for Zn2+ over a wide range of tested metal ions (excitation 424 nm and emission 496 nm), due to chelation-enhanced fluorescence process generated along with the photoinduced electron transfer process suppressed simultaneously. Moreover, the prepared zinc complex of the sensor could detect Al3+ on the basis of fluorescence resonance energy transfer mechanism and the detection limit for Al3+ was as low as 1.83 x 10(-7) M. (C) 2014 Elsevier B.V. All rights reserved.
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