A room-temperature molten salt, 1-ethyl-3-methylimidazolium tetrafluoroborate (EMIBF 4 ) with adequate purity was obtained simply by the reaction of 1-ethyl-3-methylimidazolium chloride and tetrafluoroboric acid. Silver tetrafluoroborate dissolves up to ϳ0.2 mol dm Ϫ3 in EMIBF 4 at room temperature. Electrochemical deposition and dissolution of silver on a platinum electrode were found possible in EMIBF 4 containing AgBF 4 . The reduction of monovalent silver species is electrochemically irreversible, the rate constant being estimated to be 1 ϫ 10 Ϫ 5 cm s Ϫ1 . The diffusion coefficient of Ag͑I͒ is calculated to be 6 ϫ 10 Ϫ7 cm 2 s Ϫ1 , suggesting that Ag͑I͒ exists as a substantially bare cation (Ag ϩ ) in EMIBF 4 .

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