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 journalArticle

2 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

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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