Abstract
A novel calix[4]arene receptor containing benzothiazole units in 1,3-alternate conformation (L) was synthesized and characterized by 1H, 13C, APT, COSY NMR, FTIR, elemental analysis, and UV–vis spectral data. The cation and anion binding properties of L were investigated in the presence of various cations and anions. L showed “on–off” type fluorescence response towards Cu2+ with high selectivity in aqueous solution (CH3CN/H2O, 4/1, v/v). Once binding with Cu2+, L-Cu2+ complex displayed high selectivity for sulfide. Among the various anions, only sulfide anion induced the revival of fluorescence of L, resulting in “off–on” type sensing of sulfide anion. Furthermore, L served exclusive response towards HSO4− ion via hydrolysis process with 10-fold fluorescence enhancement at 542nm.
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