Design and Synthesis of a Terbium(III) Complex-Based Luminescence Probe for Time-Gated Luminescence Detection of Mercury(II) Ions |
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Authors: | Guanfeng Cui Zhiqiang Ye Run Zhang Guilan Wang Jingli Yuan |
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Institution: | (1) State Key Laboratory of Fine Chemicals, School of Chemistry, Dalian University of Technology, Dalian, 116024, People’s Republic of China; |
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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. |
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Keywords: | |
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