The use of bis–thiadiazole and bis–oxadiazol derivatives as ionophores: A novel copper(II)–selective potentiometric electrodes

Abstract

In this study, bis–thiadiazole and bis–oxadiazol derivative molecules were synthesized and their ionophore properties were investigated. The synthesized bis–thiadiazole and bis–oxadiazol derivative molecules exhibited selectivity towards copper(II) ions. Electrodes prepared with 5,5′-(1,4-phenylene)bis(1,3,4-thiadiazol-2-amine) (4) exhibited more ideal potentiometric behavior than electrodes prepared with 5,5′-(1,4-phenylene)bis(1,3,4-oxadiazol-2-amine) (7). The copper(II)–selective electrode prepared with bis–thiadiazole derivative molecule (4) have near–Nernstian behavior (32.3 ± 3.3 mV/decade) over a wide linear working range of 1.0 × 10−6– 1.0 × 10−1 mol L−1 (R2 = 09967). The electrode exhibited a low detection limit of 9.02 × 10−7 mol L−1. These novel copper(II)–selective potentiometric electrodes were not only economical because the electroactive material was produced in the laboratory, but also had a fast response time, good selectivity and repeatability. The potential response of the electrode remained unaffected of pH in the range of 4.0 – 9.0. Finally, the developed electrode performed the determination of copper(II) ions in various water samples with very high recoveries.