Voltammetric Generation and Kinetic Stability of Nitro Anion Radical from Nitrofurazone in Ionic Liquids

Autor(es)

Chiavassa, Luisa D. ^[1] ; Camilo, Fernanda F. ^[2] ; Scalea, Mauro A. La ^[3]

Afiliação do(s) autor(es)

^[1] Univ Lisbon, Fac Ciencias, Grp Eletroquim Interfacial, Ctr Quim Estrutural, P-1749016 Lisbon - Portugal

^[2] Univ Fed Sao Paulo, Inst Ciencias Ambientais Quim & Farmaceut, Lab Mat Hibridos, Dept Quim, BR-09913030 Diadema, SP - Brazil

^[3] Univ Fed Sao Paulo, Inst Ciencias Ambientais Quim & Farmaceut, Lab Eletroquim & Eletroanal, Dept Quim, BR-09972270 Diadema, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Journal of the Brazilian Chemical Society; v. 32, n. 4, p. 889-899, APR 2021.
• Citações Web of Science: 0

Resumo

The nitrofurazone (NF) electrochemical reduction has been studied by cyclic voltammetry (CV) and square wave voltammetry (SWV) in non-aqueous medium using three different ionic liquids (IL): BMImTf(2)N, BMImBF(4) and BMMImTf(2)N, having a carbon fiber microelectrode as working electrode. In all of them, two reversible cathodic peaks were recorded for NF. Under higher frequency values, only one reversible cathodic peak was registered. The systems reversibility could also be observed by CV, since a reversible redox couple was registered for this reduction. The systems reversibility with product and reagent adsorptions on the electrode surface was confirmed and the electrons number involved in this reduction indicated the nitro-anion radical formation followed by its respective dianion. For the first reduction, the EC mechanism (an electrochemical step followed by a chemical one) was considered for the systems in aprotic medium, in which there was a probable second-order chemical reaction after the charge transfer process, being the kinetic constants calculated following the Olmstead and Nicholson model. (AU)

• Processo FAPESP: 18/20826-4 - Preparação e avaliação de propriedades de nanopartículas suportadas em filmes de celulose não modificada
• Beneficiário: Fernanda Ferraz Camilo
• Modalidade de apoio: Auxílio à Pesquisa - Regular