An easy prepared double naphthalene Schiff-base for highly selective sensing of cyanide via the dipolymer in aqueous solution

摘要

A highly selective chemosensor based on an easy-to-prepare double naphthalene Schiff-base (R) is reported for the colorimetric and fluorometric dual-channel sensing of cyanide by taking advantage of the dipolymer in DMSO-H_2O (8:2, v/v) HEPES buffer (pH 7.21) solution. The detection of cyanide was carried out via the nucleophilic attack of cyanide anion on the CvO of the probe's tautomer with a 1:1 binding stoichiometry, which could be confirmed by ~1H NMR and MS studies. The detection limit of R for the determination of cyanide was estimated to be 8.434 ￡ 1029 M. And other anions, including F~-, Cl~-, Br~-, I~-, AcO~-, H_2PO_4~-, HSO_4~-, ClO_4~-, SO_4~(2-) and N_3~-, had nearly no influence on the probing behaviour. The test strips based on R were fabricated, which could act as convenient and efficient CN~- test kits.