Han J, Tang X, Wang Y, Liu R, Wang L, Ni L. A quinoline-based fluorescence "on-off-on" probe for relay identification of Cu
2+ and Cd
2+ ions.
SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2018;
205:597-602. [PMID:
30077144 DOI:
10.1016/j.saa.2018.07.081]
[Citation(s) in RCA: 27] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/16/2017] [Revised: 07/25/2018] [Accepted: 07/30/2018] [Indexed: 06/08/2023]
Abstract
A novel fluorescent probe based 8-hydroxyquinoline (8-HQ) has been designed and synthesized. The probe 1 exhibits fast relay recognition performance for Cu2+ and Cd2+ via a fluorescence "on-off-on" response signal. The probe 1 itself has a strong emission peak at 471 nm in EtOH/H2O (v/v = 1:9) solution with a blue fluorescence. The addition of Cu2+ immediately results in the quenching of fluorescence and the limit of detection is 2.7 × 10-8 M. Moreover, the formation of [1-Cu2+] complexes can also serve as a new efficient probe system for the relay recognition of Cd2+ with the emergence of a new fluorescence signal under the same conditions. The study also found that the probe 1 has high selectivity for target ions in the presence of other competing ions. The probe 1 has been successfully applied to detect and analyze the trace amount of Cu2+ and Cd2+ in environmental water samples.
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