title: Diffusion coefficients of C60 and C60- in benzonitrile and dichloromethane solutions containing tetrabutylammonium perchlorate, measured by potential-step chronoamperometry.
abstract: The diffusion coefficients of C(60) 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 C(60) were obtained by curve fitting of the chronoamperograms to a theoretical equation by Shoup and Szabo. The values were (1.4 +/- 0.3) x 10(-9) and (4.1 +/- 0.3) x 10(-10) m(2) s(-1), respectively (the errors are 95% confidence limits). The diffusion coefficients of C(60)(-) in these solutions were measured by double potential-step chronoamperometry. The ratios of the diffusion coefficients of C(60) to those of C(60)(-) 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.
authors.affiliation: Department of Chemistry, Faculty of Science and Technology, Sophia University, 7-1 Kioi-cho, Chiyoda-ku, Tokyo 102-8554, Japan.
authors.forename: Yukihiro
authors.initials: Y
authors.lastname: Hishida
authors.forename: Minako
authors.initials: M
authors.lastname: Nishi
authors.forename: Yukie
authors.initials: Y
authors.lastname: Baba
authors.forename: Haruko
authors.initials: H
authors.lastname: Ikeuchi
mesh_terms: D004058:Diffusion; D004566:Electrodes; D004572:Electrolysis; D037741:Fullerenes / Q000737:chemistry*; D008752:Methylene Chloride / Q000737:chemistry*; D009570:Nitriles / Q000737:chemistry*; D011199:Potentiometry / Q000379:methods; D000644:Quaternary Ammonium Compounds / Q000737:chemistry*; D012680:Sensitivity and Specificity; D012996:Solutions / Q000737:chemistry; D013997:Time Factors
chemical_list: D037741:Fullerenes; D009570:Nitriles; D000644:Quaternary Ammonium Compounds; D012996:Solutions; D008752:Methylene Chloride; C014356:benzonitrile; C009405:tetrabutylammonium; C069837:fullerene C60