A water-soluble highly sensitive and selective fluorescent sensor for Hg2+ based on 2-(2-(8-hydroxyquinolin)-yl)benzimidazole via ligand-to-metal charge transfer (LMCT)

Keli Zhong, Xue Zhou, Ruibin Hou, Pei Zhou, Shuhua Hou, Yanjiang Bian, Gang Zhang, Lijun Tang, Xiaohong Shang

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34 Scopus citations

Abstract

A water-soluble fluorescent sensor (L) based on 2-(2-(8-hydroxyquinolin)- yl)benzimidazole has been synthesized and characterized. Sensor L displays highly selective and sensitive recognition of Hg2+ with a fluorescence "ON-OFF" response in buffered aqueous solution (1% dimethyl sulfoxide (DMSO), Tris-HCl 10 mM, pH = 7.4). X-ray crystal structure of the L-Hg2+ complex reveals that the oxygen and nitrogen atoms of 8-hydroxyquinoline and the imine N atom of the benzimidazole unit (N1) bind Hg2+ through a 1 : 1 binding stoichiometry. The fluorescence quenching mechanism is qualitatively evaluated by quantum chemical calculations which show that the fluorescence quenching phenomenon is caused by ligand-to-metal charge transfer (LMCT) in the excited state.

Original languageEnglish (US)
Pages (from-to)16612-16617
Number of pages6
JournalRSC Advances
Volume4
Issue number32
DOIs
StatePublished - 2014

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Chemical Engineering(all)

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