Detection of CN−, OAC−, HCO3− and Cu2+ using a novel Schiff base chemosensor: Three and two inputs combinatorial logic circuits

Abstract

In this paper, we have synthesized a novel Schiff-based ligand L, which shows an effective colorimetric sensing potential for CN−, OAC−, HCO3− and Cu2+ ions in DMF/H2O (9:1). The binding behaviors of the receptor L towards CN−, OAC− and HCO3− ions were investigated by 1H NMR, ESI-MS and UV–vis spectroscopic studies. The receptor L has complex behavior with three anions CN−, OAC− and HCO3−, especially in the presence of cation Cu2+. In addition, based on chromogenic spectroscopic analysis, it has been shown that there is an appropriate behavior towards CN−, HCO3−, OAC− and Cu2+ ions by the chemosensor L. The detection limits (obtained by the 3σ method) of compound L for CN−, OAC− and HCO3− ions were calculated to be 7.57 × 10−6, 9.34 × 10−6 and 3.26 × 10−5 mol/L, respectively. Based on Job’s analysis, the binding stoichiometry of the receptor L with CN−, HCO3− and OAC− ions was obtained. By utilizing CN−, OAC− and Cu2+ ions as the inputs, a new combinational logic circuit with three different logic gates (AND, NOT, and OR) has been constructed. With the proper selection of XOR and INH gates, the half-subtractor logic circuit was fabricated. The UV–vis absorption characteristics of L can be used to investigate complementary logic circuits composed of INH and IMP logic functions with two chemical inputs, CN− and Cu2+.