Journal
SENSORS AND ACTUATORS B-CHEMICAL
Volume 176, Issue -, Pages 775-781Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2012.09.052
Keywords
Zinc ion; Quinoline; Selectivity; Fluorescent sensor
Funding
- National Natural Science Foundation of China [20931003, 21071068]
- Fundamental Research Funds for the Central Universities [lzujbky-2012-k08]
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A new fluorescent sensor for Zn2+ based on 2-methylquinoline has been designed and synthesized. The sensor (1) demonstrates a Zn2+-specific emission enhancement linearly by a factor of 14 with a 1: 1 binding ratio even in the presence of a wide range of biological cations. This can be correlated to the efficient Zn2+ binding of 1 and to the participation of relevant amine functions in the metal coordination which promotes a good chelation-enhanced fluorescence (CHEF) effect and prevents the photoinduced electron transfer (PET) effect. Although the addition of Cd2+ also induced an emission enhancement to a certain extent, this enhancement was less pronounced as compared to that of Zn2+, which was further demonstrated by DFT calculations. (C) 2012 Elsevier B.V. All rights reserved.
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