Spectroscopic characterization and investigation of the dynamic of charge compensation process of supramolecular films derived from tetra-2-pyridyl-1,4-pyrazine ligand

Autor(es)

Wendel A. Alves ^[1] ; Valeria Pfaffen ^[2] ; Patrícia I. Ortiz ^[3] ; Susana I. Córdoba de Torresi ^[4] ; Roberto M. Torresi ^[5]

Afiliação do(s) autor(es)

^[1] Universidade Federal do ABC. Centro de Ciência Naturais e Humanas - Brasil

^[2] Universidad Nacional de Córdoba. Faculdad de Ciencias Químicas. Departamento de Físico-Química - Argentina

^[3] Universidad Nacional de Córdoba. Faculdad de Ciencias Químicas. Departamento de Físico-Química - Argentina

^[4] Universidade de São Paulo. Instituto de Química - Brasil

^[5] Universidade de São Paulo. Instituto de Química - Brasil

• Tipo de documento: Artigo Científico
• Fonte: Journal of the Brazilian Chemical Society; v. 19, n. 4, p. 651-659, 2008-00-00.

Resumo

This work describes the infrared spectroscopy characterization and the charge compensation dynamics in supramolecular film FeTPPZFeCN derived from tetra-2-pyridyl-1,4-pyrazine (TPPZ) with hexacyanoferrate, as well as the hybrid film formed by FeTPPZFeCN and polypyrrole (PPy). For supramolecular film, it was found that anion flux is greater in a K+ containing solution than in Li+ solution, which seems to be due to the larger crystalline ionic radius of K+. The electroneutralization process is discussed in terms of electrostatic interactions between cations and metallic centers in the hosting matrix. The nature of the charge compensation process differs from others modified electrodes based on Prussian blue films, where only cations such as K+ participate in the electroneutralization process. In the case of FeTPPZFeCN/PPy hybrid film, the magnitude of the anions’s flux is also dependent on the identity of the anion of the supporting electrolyte. (AU)

• Processo FAPESP: 03/10015-3 - Arranjos organizados de macromoléculas e nanoestruturas para o desenvolvimento de sensores e microbaterias
• Beneficiário: Roberto Manuel Torresi
• Modalidade de apoio: Auxílio à Pesquisa - Programa PRONEX - Temático