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Conducting polymer films of 4(5-chloro-2-pyridylazo)1,3-diaminobenzene and its cobalt complex Part I: Anodic polymerization in aqueous solutions

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Abstract

New electroactive polymer films of 4(5-chloro-2-pyridylazo)-1,3-diaminobenzene and its cobalt complex (abbreviated as PL and PCoL2) have been prepared on glassy carbon in 1.0m HCl by oxidative polymerization. Cyclic voltammetry, potential step chronoamperometry, SEM and IR spectroscopy were used to characterize the polymer films. The films were found to be thin and insoluble in aqueous solutions and common organic solvents. The electroactivity of the polymers in acidic solutions is attributed to a proton + electron addition/elimination process at -NH- sites in the polymer backbone. The diffusion coefficient for the charge propagation through PCoL2 films was found to be higher than for PL formed under identical conditions. No reversible electrochemistry due to the cobalt complex could be detected in the potential range −600 to 800mV vs SCE in HCl solutions. The electronic conductivity of PCoL2 is much higher than for PL and it was found to decrease with increase in the film thickness.

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Authors and Affiliations

  1. Department of Chemistry, Faculty of Science, Cairo University, Giza, Egypt

    H. A. Abd El-Rahman & H. H. Rehan

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  1. H. A. Abd El-Rahman
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  2. H. H. Rehan
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Abd El-Rahman, H.A., Rehan, H.H. Conducting polymer films of 4(5-chloro-2-pyridylazo)1,3-diaminobenzene and its cobalt complex Part I: Anodic polymerization in aqueous solutions. J Appl Electrochem 23, 827–834 (1993). https://doi.org/10.1007/BF00249956

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  • DOI: https://doi.org/10.1007/BF00249956

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