Journal
JOURNAL OF PHYSICAL CHEMISTRY A
Volume 114, Issue 51, Pages 13370-13375Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jp109304q
Keywords
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Funding
- National Natural Science Foundation of China [20604011, 20974044, 90923006]
- National Basic Research Program of China [2007CB925103]
- Program For New Century Excellent Talents in University [NCET-06-0451]
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A new fluoroionophore [E-4,4'-di(N-(2-pyridyl)amino)stilbene, E1] with a donor-acceptor-donor framework, which features a central stilbene (acceptor) fluorophore and two terminal pyridylamino (donor) ionophores, is reported. The probe displays an ultrasensitive fluorescence quenching response toward Hg2+ in H2O/THF. Coordination of Hg2+ to E1 affords a 2:1 complex, enabling the detection of Hg2+ at a concentration as low as 4.4 x 10(-14) M. The interactions between the two species have been thoroughly characterized with UV-vis absorption spectroscopy, fluorescence spectroscopy, and nuclear magnetic resonance spectroscopy. Density functional theory calculations provide further insights into the nature of the fluorescence quenching response. In contrast, a fluorescent molecule with the donor-acceptor architecture, E-4-(N-(2-pyridyl)amino)stilbene (E4), exhibits a greatly attenuated fluorescence quenching response toward Hg2+.
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