Highly selective imidazole-appended 9,10-N,N″-diaminomethylanthracene fluorescent probe for switch-on Zn2+ detection and switch-off H2PO4 and CN detection in 80% aqueous DMSO, and applications to sequential logic gate operations

Anup Pandith, Nizam Uddin, Cheol Ho Choi, Hong Seok Kim

Research output: Contribution to journalArticlepeer-review

37 Citations (Scopus)

Abstract

A new imidazole-appended anthracene-based photoinduced electron transfer (PET) probe (P) was designed and synthesized. Probe P detected Zn2+ selectively in an 80% aqueous solution of dimethyl sulfoxide (DMSO) through a switch-on response at pH 7.5 without any interference from other metal ions. Probe P exhibited a moderately strong association constant (Ka) of 1.41 × 105 M−1 and associated with Zn2+ ions with 1:1 stoichiometry. The in situ-generated P•Zn2+ (1:1) ensemble detected H2PO4 and CN ions sequentially through switch-off responses. The selective discrimination of H2PO4 and CN ions occurred both in the absence and presence of Ca2+ ions at pH 7.5 in a N-2-hydroxyethylpiperazine-N-2-ethanesulfonic acid (HEPES) buffer. The switch-on response was driven by the selective complexation of P with Zn2+ ions, mediated by the combined effects of PET and chelation-induced enhanced fluorescence, resulting in a more structurally rigid complex. Applications of P to real water sample analysis and sequential logic gate operations were demonstrated. The lowest detection limits for Zn2+, H2PO4 , and CN ions in 80% aqueous DMSO were determined to be 1.0 × 10−9, 1.0 × 10−9, and 8.0 × 10−9 M, respectively.

Original languageEnglish
Pages (from-to)840-849
Number of pages10
JournalSensors and Actuators, B: Chemical
Volume247
DOIs
Publication statusPublished - 2017
Externally publishedYes

Keywords

  • CN
  • HPO
  • Imidazole
  • Logic gates
  • Sequential detection
  • Zn-ensemble

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Instrumentation
  • Condensed Matter Physics
  • Surfaces, Coatings and Films
  • Metals and Alloys
  • Electrical and Electronic Engineering
  • Materials Chemistry

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