Spectroscopic Characterization and Investigation of the Dynamic of Charge Compensation Process of Supramolecular Films Derived from Tetra-2-pyridyl-1,4-pyrazine Ligand

نویسندگان

  • Wendel A. Alves
  • Valeria Pfaffen
  • Patrícia I. Ortiz
  • Susana I. Córdoba
  • Roberto M. Torresi
چکیده

Este trabalho descreve a caracterização espectroscópica por infravermelho e o estudo da dinâmica de compensação de cargas do filme supramolecular FeTPPZFeCN derivado do ligante tetra-2-piridil-1,4-pirazina (TPPZ) com hexacianoferrato, bem como o filme híbrido envolvendo FeTPPZFeCN e uma matriz de polipirrol (PPy). Para o filme supramolecular, foi observado um aumento no fluxo de ânion em solução contendo K em relação ao Li, que parece estar relacionado ao tamanho do raio iônico cristalino do K. O processo de eletroneutralização é discutido em termos de interação eletrostática entre cátions e centros metálicos na matriz hospedeira. A natureza do processo de compensação de carga difere de outros eletrodos modificados derivados do azul da Prússia, onde somente cátions tais como K participam no processo de eletroneutralização. No caso do filme híbrido FeTPPZFeCN/PPy, a magnitude do fluxo de ânions é também dependente da identidade do ânion em diferentes eletrólitos de suporte.

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تاریخ انتشار 2008