Abstract

In this work, electrocatalytic changes of Cu(ii) triazole complexes (Cu(L)(2)) resulting from inductive effects were evaluated to fabricate a sensor for hydrogen peroxide (H2O2) determination. Three copper(ii) complexes with electronically differentiated ligands were synthesized by slow diffusion method and characterized by X-ray crystallography, Fourier transformed infrared (FTIR), UV-Vis, scanning electron microscopy (SEM) and voltammetry cyclic (CV). Cu(L-OMe)(2)/GC, Cu(L-Br)(2)/GC and Cu(L-NO2)(2)/GC sensors were then prepared. Under optimal conditions (pH = 11), the optimal sensor presented a response at -0.5 V, good linear range of 1-32 mu M, reproducibility (1.7%), repeatability (1.2%), LOD of 0.0246 mu M (S/N = 5), LOQ of 0.0747 mu M (S/N = 5) and selectivity. Additionally, Cu(L-NO2)(2)/GC sensor has been successfully applied in commercial substances, such as mouthwash, milk and tea.