Diffusion Coefficients of C60 and C60- in Benzonitrile and Dichloromethane Solutions Containing Tetrabutylammonium Perchlorate, Measured by Potential-step Chronoamperometry

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  • HISHIDA Yukihiro
    Department of Chemistry, Faculty of Science and Technology, Sophia University
  • NISHI Minako
    Department of Chemistry, Faculty of Science and Technology, Sophia University
  • BABA Yukie
    Department of Chemistry, Faculty of Science and Technology, Sophia University
  • IKEUCHI Haruko
    Department of Chemistry, Faculty of Science and Technology, Sophia University

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Abstract

The diffusion coefficients of C60 in dichloromethane and benzonitrile solutions containing 0.1 M tetrabutylammonium perchlorate were determined by single potential-step chronoamperometry at small disk electrodes. The diffusion coefficients of C60 were obtained by curve fitting of the chronoamperograms to a theoretical equation by Shoup and Szabo. The values were (1.4 ± 0.3) × 10-9 and (4.1 ± 0.3) × 10-10 m2 s-1, respectively (the errors are 95% confidence limits). The diffusion coefficients of C60- in these solutions were measured by double potential-step chronoamperometry. The ratios of the diffusion coefficients of C60 to those of C60- were obtained from theoretical curves of the ratios of the current at the second potential step to the current at the first one. The values of the ratios were 1.2 ± 0.2 and 1.0 ± 0.3, respectively.

Journal

  • Analytical Sciences

    Analytical Sciences 22 (7), 931-935, 2006

    The Japan Society for Analytical Chemistry

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