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Effects of Alkyl Chain Lengths and Isomers of Alcohols on the Phase Behavior of 1-Alkyl-3-methylimidazolium-Based Ionic Liquid + Alcohol Mixtures
Journal of Chemical & Engineering Data ( IF 2.0 ) Pub Date : 2024-01-26 , DOI: 10.1021/acs.jced.3c00613 Takuya Shimomura 1 , Masahiro Usui 1
Journal of Chemical & Engineering Data ( IF 2.0 ) Pub Date : 2024-01-26 , DOI: 10.1021/acs.jced.3c00613 Takuya Shimomura 1 , Masahiro Usui 1
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Phase separation temperatures of alcohol mixtures of imidazolium-based ionic liquids (IL), 1-alkyl-3-methylimidazolium bis(trifluoromethanesulfonyl)amide ([Cnmim][TFSA]) and 1-alkyl-3-methylimidazolium tetrafluoroborate ([Cnmim][BF4]), have been measured in order to elucidate the effects of alkyl chain lengths and isomers of alcohols on the phase behavior of IL + alcohol mixtures. The investigated IL + alcohol mixtures showed liquid–liquid upper critical solution temperature (UCST)-type phase behavior. The phase separation temperatures of IL + alcohol mixtures increased with elongation of the alkyl chain length of alcohol. The phase separation temperatures of IL + butanol mixtures were higher in the order of 2-methyl-1-propanol (i-BuOH) ≈ 1-butanol (1-BuOH) > 2-butanol (2-BuOH) > 2-methyl-2-propanol (t-BuOH). On the other hand, the isomerism effects of propanols on the phase separation temperatures were hardly observed. The UCSTs, Tc, obtained from the phase separation temperatures decreased linearly with elongation of the alkyl chain length of ILs.
中文翻译：
烷基链长度和醇异构体对 1-烷基-3-甲基咪唑鎓基离子液体 + 醇混合物相行为的影响
咪唑基离子液体 (IL)、1-烷基-3-甲基咪唑鎓双(三氟甲磺酰基)酰胺 ([C n mim][TFSA]) 和 1-烷基-3-甲基咪唑鎓四氟硼酸盐 ([C测量了n mim][BF 4 ]），以阐明烷基链长度和醇异构体对 IL + 醇混合物相行为的影响。所研究的 IL + 醇混合物表现出液-液上临界溶液温度 (UCST) 型相行为。IL+醇混合物的相分离温度随着醇的烷基链长度的延长而增加。IL + 丁醇混合物的相分离温度较高，顺序为 2-甲基-1-丙醇 ( i -BuOH) ≈ 1-丁醇 (1-BuOH) > 2-丁醇 (2-BuOH) > 2-甲基- 2-丙醇（t -BuOH）。另一方面，几乎没有观察到丙醇对相分离温度的异构效应。从相分离温度获得的UCST、T c随 IL 烷基链长度的延长而线性下降。
更新日期：2024-01-26
中文翻译：
烷基链长度和醇异构体对 1-烷基-3-甲基咪唑鎓基离子液体 + 醇混合物相行为的影响
咪唑基离子液体 (IL)、1-烷基-3-甲基咪唑鎓双(三氟甲磺酰基)酰胺 ([C n mim][TFSA]) 和 1-烷基-3-甲基咪唑鎓四氟硼酸盐 ([C测量了n mim][BF 4 ]），以阐明烷基链长度和醇异构体对 IL + 醇混合物相行为的影响。所研究的 IL + 醇混合物表现出液-液上临界溶液温度 (UCST) 型相行为。IL+醇混合物的相分离温度随着醇的烷基链长度的延长而增加。IL + 丁醇混合物的相分离温度较高，顺序为 2-甲基-1-丙醇 ( i -BuOH) ≈ 1-丁醇 (1-BuOH) > 2-丁醇 (2-BuOH) > 2-甲基- 2-丙醇（t -BuOH）。另一方面，几乎没有观察到丙醇对相分离温度的异构效应。从相分离温度获得的UCST、T c随 IL 烷基链长度的延长而线性下降。
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