Novel receptor for the rapid reaction and colorimetric detection of HSO₃ ⁻ in aqueous solutions

Abstract

A novel high-yield Schiff base was designed and synthesized as an anion receptor that specifically select HSO₃ ⁻ anions in aqueous solutions of H₂O/DMSO(15:85, volume ratio), which can be detected via colorimetry under direct visualization. The sensor exhibited different results for other anions, such as F⁻, Cl⁻, Br⁻, I⁻, H₂PO₄ ⁻, AcO⁻, HSO₄ ⁻ and ClO₄ ⁻. The changes in the UV-Vis spectra also show the specific recognition of HSO₃ ⁻, rather than similar anions H₂PO₄ ⁻ and HSO₄ ⁻ in the same aqueous solution. The detection limit of HSO₃ ⁻ was 1×10⁻⁶ mol/L.

Keywords

Bisulfite anion sensor / 2-Aminobenzimidazole / Aqueous solution / Single recognition / Colorimetry

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