An ionic 1,4-bis(Styryl)benzene-based fluorescent probe for mercury(ii) detection in water via deprotection of the thioacetal group

Van Sang Le, Ji Eun Jeong, Huy Tuan Huynh, Jiae Lee, Han Young Woo

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)

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 ~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.

Original languageEnglish
Article number2082
Pages (from-to)1-11
Number of pages11
JournalSensors (Switzerland)
Volume16
Issue number12
DOIs
Publication statusPublished - 2016

Bibliographical note

Funding Information:
Acknowledgments: This research was supported by the Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education (Grant No. 20120020209, 2015R1D1A1A09056905, 2015R1A2A1A15055605).

Publisher Copyright:
© 2016, MDPI AG. All rights reserved.

Keywords

  • Aqueous media
  • Chemosensor
  • Conjugated oligoelectrolyte
  • Fluorescent sensor
  • Mercury

ASJC Scopus subject areas

  • Analytical Chemistry
  • Biochemistry
  • Atomic and Molecular Physics, and Optics
  • Instrumentation
  • Electrical and Electronic Engineering

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