Uranyl Species in 1-Ethyl-3-methylimidazolium Nitrate ([EMI][NO3]) Solution of [EMI](2)[UO2(NO3)(4)]: First Spectrophotometric Evidence for Existence of [UO2(NO3)(4)](2-)

Sasaki K; Suzuki T; Arai T; Takao K; Suzuki S; Yaita T; Ikeda Y

Chemistry Letters, Vol.43, No.5, 670-672, 2014

Sasaki K, Suzuki T, Arai T, Takao K, Suzuki S, Yaita T, Ikeda Y

In order to examine chemical forms of uranyl species in nitrate-based ionic liquid (IL), we have performed spectrophotometric experiments for [EMI][NO3] (EMI: 1-ethy1-3-methyl-imidazolium) and CH3CN solution of [EMI](2)[UO2(NO3)(4)]. As a result, it was found that in CH3CN solution uranyl species exist as [UO2(NO3)(3)]-, that with an increase in [NO3]- the [UO2(NO3)(4)](2-) species is formed, and that uranyl species in neat [EMI][NO3] exist as [UO2(NO3)(4)](2-). This is the first spectro-photometric evidence for formation of [UO2(NO3)(4)](2-) in IL.