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Indexed by:期刊论文

Date of Publication:2012-01-01

Journal:JOURNAL OF FLUORESCENCE

Included Journals:SCIE、EI、PubMed

Volume:22

Issue:1

Page Number:261-267

ISSN No.:1053-0509

Key Words:Luminescent probe; Terbium complex; Mercury ions; Time-gated luminescence detection

Abstract:Time-gated luminescence detection technique using lanthanide complexes as luminescent probes is a useful and highly sensitive method. However, the effective application of this technique is limited by the lack of the target-responsive luminescent lanthanide complexes that can specifically recognize various analytes in aqueous solutions. In this work, a dual-functional ligand that can form a stable complex with Tb3+ and specifically recognize Hg2+ ions in aqueous solutions, N,N,N-1,N-1-{[2,6-bis(3'-aminomethyl-1'-pyrazolyl)-4-[N,N-bis(3 '',6 ''-dithiaoctyl)-aminomethyl]-pyridine]} tetrakis(acetic acid) (BBAPTA), has been designed and synthesized. The luminescence of its Tb3+ complex is weak, but can be effectively enhanced upon reaction with Hg2+ ions in aqueous solutions. The luminescence response investigations of BBAPTA-Tb3+ to various metal ions indicate that the complex has a good luminescence sensing selectivity for Hg2+ ions, but not for other metal ions. Thus a highly sensitive time-gated luminescence detection method for Hg2+ ions was developed by using BBAPTA-Tb3+ as a luminescent probe. The dose-dependent luminescence enhancement of the probe shows a good linearity with a detection limit of 17 nM for Hg2+ ions. These results demonstrated the efficacy and advantages of the new Tb3+ complex-based luminescence probe for the sensitive and selective detection of Hg2+ ions.