烷基链长对咪唑类离子液体-甲醇体系局部组成的影响

Effection of alkyl chain length on local composition of imidazolium-based ionic liquids-methanol systems

在全浓度范围内测定了3种离子液体-甲醇体系,即1-乙基-3-甲基咪唑四氟硼酸盐-甲醇体系、1-丁基-3-甲基咪唑四氟硼酸盐-甲醇体系和1-己基-3-甲基咪唑四氟硼酸盐-甲醇体系的核磁共振氢谱(1H NMR),运用局部组成模型对离子液体和甲醇的化学位移进行关联,得到了表征溶液内部微观环境的局部摩尔分数,分析了烷基链长对咪唑类离子液体-甲醇体系局部组成的影响。结果表明在这3种离子液体-甲醇体系中,离子液体的局部组成与宏观组成差异性非常小,甲醇分子在侧链越长的咪唑类离子液体中越倾向于自身缔合。

The 1H NMR of three ionic liquids-methanol （ILs-methanol） systems was measured over the whole range of mole fraction from 0 to 1. The three ILs-methanol systems were 1-ethyl-3-methylimidazolium tetrafluoroborate-methanol system , 1-butyl-3-methylimidazolium tetrafluoroborate-methanol system and 1-hexyl-3-methylimidazolium tetrafluoroborate-methanol system. The local composition model was used to correlate 1H NMR chemical shifts values of ILs and methanol. The obtained local mole fraction was used to analyze the local structure of three ILs-methanol systems. The effect of alkyl chain length in cations was studied. The difference between local composition and macroscopic composition of the ionic liquids was very small in three ILs-methanol systems. Methanol molecules preferred to self-associate in the imidazolium-based ILs with a long alkyl chain.