Two new copper(II) complexes of 1-Butyl-1H-1,2,4-triazole: synthesis, characterization and electrocatalytic activity

Ke Fei Wang,Fang Fang Jian,Rui Rui Zhuang

doi:10.1590/s0103-50532010000400005

Abstract

Two new copper(II) complexes, [Cu4Cl6O(C6H11 N3)4] (1) and [CuBr2(C6H11N3)4] (2), were synthesized and characterized by single crystal X-ray diffractometry, IR spectroscopy and elemental analysis. They were used as bulk modifiers for the fabrication of two carbon paste electrodes (Cu-CPE): 1-CPE and 2-CPE. They had similar electrochemical behaviors characterized by cyclic voltammetry and good electrocatalytic activities toward the reduction of hydrogen peroxide and trichloroacetic acid. The detection limits, linear calibration ranges and sensitivities were respectively 0.01 μmol L-1, 0.02 to 0.20 μmol L-1 and 98.80 μA μmol L-1 for hydrogen peroxide detection, and 0.01 μmol L-1, 0.02 to 0.20 μmol L-1 and 80.05 μA μmol L-1 for trichloroacetic acid detection.

Highlights

Application of chemically modified electrodes (CMEs) in electrochemical determinations has been widely considered as a sensitive and selective analytical method for the detection of trace amounts of many compounds.[1,2,3] One of the most important properties of CMEs, in comparison to unmodified electrodes, is their ability to catalyze the electrode process with significant decrease of the needed overpotential
Metal complexes are well recognized for their excellent electrocatalytic properties toward the detection of hydrogen peroxide,[4,5,6] nitrite,[4,5,6,7] bromate[5,6,7] and trichloroacetic acid,[8] among other analytes
Vol 21, No 4, 2010 peroxide and trichloroacetic acid (TCA), and gave a low detection limit for hydrogen peroxide when compared with the zinc complex of 1-pentyl-1H-benzo[d][1,2,3]triazole

Summary

Introduction

Application of chemically modified electrodes (CMEs) in electrochemical determinations has been widely considered as a sensitive and selective analytical method for the detection of trace amounts of many compounds.[1,2,3] One of the most important properties of CMEs, in comparison to unmodified electrodes, is their ability to catalyze the electrode process with significant decrease of the needed overpotential. *e-mail: ffj2003@163169.net thioether, imidazole and imine donors, which stem from their fascinating structures and from their potential applications as new materials.[10,11,12,13] The electrochemical and electrocatalytical properties of copper complexes with various different ligands have been investigated by several groups.[6,7,13,14] The two modified electrodes showed good electrocatalytic activities toward the reduction of hydrogen

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Results

Conclusion