JOURNAL OF CHILEAN CHEMICAL SOCIETY

Vol 62 No 2 (2017): Journal of the Chilean Chemical Society
Original Research Papers

ELECTROANALYTICAL ANALYSIS OF GLASSY CARBON ELECTRODE MODIFIED WITH COOH− AND NO2− FUNCTIONALIZED POLYSPYROPHOSPHAZENES

Maria Luisa Valenzuela
Universidad Autónoma de Chile, Instituto de Ciencias Químicas Aplicadas, Centro de Materiales Poliméricos y Macromoléculas
Regina Cisternas
Universidad Autónoma de Chile, Instituto de Ciencias Químicas Aplicadas, Centro de Materiales Poliméricos y Macromoléculas
Paola Jara-Ulloa
Universidad Andres Bello. Facultad de Ciencias Exactas. Departamento de Ciencias Químicas
Lissette Rodriguez
Universidad Andres Bello. Facultad de Ciencias Exactas. Departamento de Ciencias Químicas
Published June 16, 2017
Keywords
  • Functionalized polyphosphazenes,
  • Modified electrode,
  • Cyclic voltammetry,
  • Blocking effect,
  • Ferrocene

Abstract

Glassy carbon electrode modified with COOH− and NO2−functionalized polyspyrophosphazenes were used to study the redox process of a electroactive probe (ferrocene) in non-aqueous electrolyte. The electrochemical behavior of polyphosphazenes substituted with COOH and NO2 groups has been studied using cyclic voltammetry. Their blocking properties depend on the substituent group and on the substitution/nitration degree. The oxoreduction of the couple Fc/Fc+ occurs with rapid redox kinetic at the modified glassy carbon electrode with high nitration degree NO2−functionalized polyspyrophosphazene. The polymers were immobilized on the glassy carbon surface at different concentrations to study surface charge density effect. In this report were studied the reproducibility, repeatability and stability of the modified electrodes.

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