Atividade eletrocatalítica de sistemas biomiméticos da enzima catalase

• Main Authors: Iorquirene de Oliveira Matos, Wendel A Alves, Otaciro R Nascimento
• Format: Article
• Language: English
• Published: Sociedade Brasileira de Química 2011-09-01
• Series: Química Nova
• Subjects: enzymeless biosensors; copper(II) complexes; bioinorganic chemistry
• Online Access: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-40422011000900019&lng=en&tlng=en

In this work, we describe the immobilization of the dinuclear compound [Cu2(apyhist)2Cl2](ClO4)2 (1) and its derived cations complexes, obtained in water solution or by deprotonation of the imidazolate moiety in the ligand leading to a cyclic tetranuclear species, in the Nafion® membrane on glass carbon electrode surface. After that, we studied the influence of the equilibrium in the electrocatalytic activity towards the reduction of H2O2 in the development of an amperometric sensor for the analytical determination of hydrogen peroxide. This strategy proved successful, and the electrochemical behaviour of the all complexes formed within the Nafion® coatings was characterized. We also provide evidence that its related cyclic tetranuclear imidazolate-bridged complex acts as a catalysts for the intramolecular, two-electron reduction of H2O2.