An Ionic 1,4-Bis(styryl)benzene-Based Fluorescent Probe for Mercury(II) Detection in Water via Deprotection of the Thioacetal Group
- Authors
- Van Sang Le; Jeong, Ji-Eun; Huy Tuan Huynh; Lee, Jiae; Woo, Han Young
- Issue Date
- 12월-2016
- Publisher
- MDPI AG
- Keywords
- mercury; conjugated oligoelectrolyte; aqueous media; chemosensor; fluorescent sensor
- Citation
- SENSORS, v.16, no.12
- Indexed
- SCIE
SCOPUS
- Journal Title
- SENSORS
- Volume
- 16
- Number
- 12
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/86653
- DOI
- 10.3390/s16122082
- ISSN
- 1424-8220
- Abstract
- Highly sensitive and selective mercury detection in aqueous media is urgently needed because mercury poisoning usually results from exposure to water-soluble forms of mercury by inhalation and/or ingesting. An ionic conjugated oligoelectrolye (M1Q) based on 1,4-bis(styryl) benzene was synthesized as a fluorescent mercury(II) probe. The thioacetal moiety and quaternized ammonium group were incorporated for Hg2+ recognition and water solubility. A neutral Hg2+ probe (M1) was also prepared based on the same molecular backbone, and their sensor characteristics were investigated in a mixture of acetonitrile/water and in water. In the presence of Hg2+, the thioacetal group was converted to aldehyde functionality, and the resulting photoluminescence intensity decreased. In water, M1Q successfully demonstrated highly sensitive detection, showing a binding toward Hg2+ that was similar to 15 times stronger and a signal on/off ratio twice as high, compared to M1 in acetonitrile/water. The thioacetal deprotection by Hg2+ ions was substantially facilitated in water without an organic cosolvent. The limit of detection was measured to be 7 nM with a detection range of 10-180 nM in 100% aqueous medium.
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