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

HISHIDA Yukihiro, NISHI Minako, BABA Yukie, IKEUCHI Haruko

doi:10.2116/analsci.22.931

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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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.