Properties of ester-based functional ionic liquids and their application in sampling in air

doi:10.3969/j.issn.0438-1157.2013.z1.025

Abstract

Abstract: The ionic liquids 1-methyl acetate-3-methylimidazolium bis(trifluoromethanesulfonyl) imide([CH₂COOCH₃MIM]NTf₂) and 1-(4-methyl)-methyl benzoate-3-methylimidazolium bis(trifluoromethanesulfonyl) imide([CH₂C₆H₄COOCH₃MIM]NTf₂)were synthesized by traditional two-step method. Then study the thermal stability,solubility in different solvents and the conductivities in various solvents including acetonitrile, DMSO, methanol and ethyl acetate of the ionic liquids. And compare the enrichment effect of them with Tenax. The results show that the ionic liquids don’t decompose under 300℃and they can solve in most organic solvents and link with the polarity of the solvents. The conductivity of ionic liquids in different solvents increases with the rise of concentration and temperature. The conductivity order is κ (acetonitrile as solvent) > κ (methanol) > κ (DMSO) > κ (ethyl acetate).The enrichment effect of [CH₂COOCH₃MIM]NTf₂ is better than Tenax.

Key words: ionic liquids, conductivity, thermal stability, enrichment

摘要： 合成了两种新型酯基功能性离子液体1-乙酸甲酯基-3-甲基咪唑双三氟甲基磺酰亚胺([CH₂COOCH₃MIM]NTf₂)和1-对甲基苯甲酸甲酯基-3-甲基咪唑双三氟甲基磺酰亚胺([CH₂C₆H₄COOCH₃MIM]NTf₂)，研究了化合物的热稳定性，在各种溶剂中的溶解性以及在有机溶剂乙腈、DMSO、甲醇和乙酸乙酯中的电导率，同时比较了其与常用的富集材料Tenax的富集效果。结果表明：该类离子液体在300℃以下基本没有失重，热稳定性较好；能与大多数有机溶剂互溶，溶解性随着溶剂极性的增加而增大；离子液体的电导率随着浓度和温度的升高而升高，且在不同有机溶剂中电导率相差较大，其顺序为κ(乙腈作溶剂)>κ(甲醇作溶剂)>κ(DMSO作溶剂)>κ(乙酸乙酯作溶剂)；离子液体[CH₂COOCH₃MIM]NTf₂对酯类物质的富集效果优于Tenax。

关键词: 离子液体, 电导率, 热稳定性, 富集

CLC Number:

O626.23

LIU Chaoqing, WANG Xiaoyi, REN Hairong, SUN Dongling, ZHAO Jingqiang. Properties of ester-based functional ionic liquids and their application in sampling in air[J]. CIESC Journal, 2013, 64(S1): 165-169.

刘潮清, 王小逸, 任海荣, 孙东玲, 赵靖强. 酯基功能性离子液体性质及其在空气采样中的应用[J]. 化工学报, 2013, 64(S1): 165-169.

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