No 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 m 2 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.