γ辐照引发[Cnmim][NTf2]离子液体变色研究

doi:10.3866/PKU.WHXB201212102

Abstract

Abstract:

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.

Key words: Ionic liquid, Irradiation, Color, Spectrum, Aggregation state

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 Phys. -Chim. Sin. 2013, 29(03), 619-624. doi: 10.3866/PKU.WHXB201212102

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

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