A highly selective and sensitive fluorescent sensor for the rapid detection of Hg²⁺ based on phenylamine-oligothiophene derivative

Spectrochim Acta A Mol Biomol Spectrosc. 2016 Jan 15:153:143-6. doi: 10.1016/j.saa.2015.08.019. Epub 2015 Aug 18.

Abstract

A fast-responsive fluorescent phenylamine-oligothiophene sensor 3TDDA was reported. This sensor exhibited highly selective and sensitive detection of Hg(2+) ion in aqueous solution (THF/CH3CN/H2O, 45/50/5, v/v) through fluorescence quenching. The detection was not affected by the coexistence of other competitive metal ions such as Na(+), K(+), Ag(+), Ca(2+), Fe(3+), Al(3+), Co(2+), Ni(2+), Zn(2+), Pb(2+), Cd(2+), Fe(2+) and Cr(3+). A stoichiometric ratio (1:1) of the sensor and Hg(2+) was determined by a Job's plot and mole-ratio curves. The binding of sensor 3TDDA and Hg(2+) was also chemically reversible with EDTA. The detection limit was calculated as low as 4.392×10(-7) M.

Keywords: Fluorescence sensor; Mercury ion; Oligothiophene; Quenching.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Aniline Compounds / chemistry*
  • Fluorescent Dyes / chemistry*
  • Ions
  • Mercury / analysis*
  • Spectrometry, Fluorescence
  • Spectrophotometry, Ultraviolet
  • Thiophenes / chemistry*
  • Time Factors

Substances

  • Aniline Compounds
  • Fluorescent Dyes
  • Ions
  • Thiophenes
  • Mercury
  • aniline