Citation: CUI Zhen-Peng, WANG Shuo-Jue, AO Yin-Yong, PENG Jing, LI Jiu-Qiang, ZHAI Mao-Lin. Study of γ Radiation-Induced Colored Products on [C_nmim][NTf₂] Ionic Liquids[J]. Acta Physico-Chimica Sinica, ;2013, 29(03): 619-624. doi: 10.3866/PKU.WHXB201212102 shu

Study of γ Radiation-Induced Colored Products on [C_nmim][NTf₂] Ionic Liquids

1.
Beijing National Laboratory for Molecular Sciences, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, P.R.China

Received Date: 21 September 2012
Available Online: 10 December 2012
Fund Project: 国家自然科学基金(21073008, 11079007, 91126014)资助项目 (21073008, 11079007, 91126014)

Ionic liquids 1-alkyl-3-methylbis(trifluoromethylsulfonyl)imide ([C_nmim][NTf₂]) are promising separating reagents in the nuclear fuel cycle. Their chemical structure changes slightly when exposed to γ radiation, but the apparent darkening of [C_nmim][NTf₂] occurs at low dose. This radiation-induced darkening of [C_nmim][NTf₂] should be investigated further. To understand the effect of radiation on [C_nmim][NTf₂], we systematically studied the influences of the length of the C(1)―alkyl chain and substitution of C(2)―H on the UV-Vis spectra of irradiated [C_nmim][NTf₂]. Fluorescence and mass spectra of [C_nmim][NTf₂] allowed the possible colored products to be determined. The darkening of [C_nmim][NTf₂] is more obvious as the length of the C(1)―alkyl chain and absorbed dose increase, but it is weakened effectively after methylation at the C(2)-position of the imidazole ring. The dominant colored products are possibly imidazolium cations containing double bonds, dimers of imidazolium cations and fluorinated imidazolium compounds. Imidazolium cations could aggregate through π-π stacking after γ-irradiation, and the associated states may also play a role in darkening these ionic liquids.
- Ionic liquid,
- Irradiation,
- Color,
- Spectrum,
- Aggregation state
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1.
沈阳化工大学材料科学与工程学院沈阳 110142

Study of γ Radiation-Induced Colored Products on [Cnmim][NTf2] Ionic Liquids

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通讯作者: 陈斌, bchen63@163.com

Study of γ Radiation-Induced Colored Products on [C_nmim][NTf₂] Ionic Liquids