2018 年 86 巻 5 号 p. 260-264
Electrochemical behavior of Sn was investigated on a GC electrode in an aprotic ionic liquid, 1-butyl-1-methylpyrrolidinium bis(trifluoromethylsulfonyl)amide (BMPTFSA) containing BMPCl and SnCl2 at 298 K. SnCl2 was found to dissolve as [SnCl4]2− by potentiometry. The formal potential of [SnCl4]2−/Sn was −1.67 V vs. Ag|Ag(I) (−1.24 V vs. ferrocene|ferrocenium), which was more negative than that in BMPTFSA without chloride ions. Electrodeposition of Sn was possible by reduction of [SnCl4]2− in the ionic liquid. The dissociation of [SnCl4]2− was suggested from the diffusion coefficient of [SnCl4]2−. Tubular deposits with an inner diameter of 1–1.5 µm were obtained in addition to granular deposits by potentiostatic cathodic reduction at −2.0 V.