Spectroelectrochemical Identification of the Active Sites for Protons and Anions Insertions into Poly-(Azure A) Thin Polymer Films - Sorbonne Université Access content directly
Journal Articles Journal of Physical Chemistry C Year : 2007

Spectroelectrochemical Identification of the Active Sites for Protons and Anions Insertions into Poly-(Azure A) Thin Polymer Films

Abstract

Poly-(Azure A) films deposited on indium−tin oxide electrodes were simultaneously characterized by visible/near-infrared spectroscopy and EIS techniques at different polarization potentials and pH. The instantaneous variation of the absorbance with the potential (dA/dE) at 685 and 875 nm was correlated with the kinetic parameters obtained from the analysis of the electrochemical impedance results (dΓH+(E)/dE and GA-). Thus, the relative participation of the hydrogen ion and anions was quantified in each chemical step coupled to the successive electron-transfer reactions of two different electroactive double bonds of this electrochromic material:  an amino bridge and the phenothiazine ring. The stoichiometry of the active sites and counter ions into the host polymer are determined from the calculated kinetic ion-insertion parameters. This procedure allows the electrical and electrochemical properties of redox-conducting polymers to be known thoroughly.

Dates and versions

hal-04160041 , version 1 (12-07-2023)

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Cite

J. Agrisuelas, Claude Gabrielli, J. García-Jareño, D. Giménez-Romero, Hubert Perrot, et al.. Spectroelectrochemical Identification of the Active Sites for Protons and Anions Insertions into Poly-(Azure A) Thin Polymer Films. Journal of Physical Chemistry C, 2007, 111 (38), pp.14230-14237. ⟨10.1021/jp0741197⟩. ⟨hal-04160041⟩
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