中文摘要：

合成了系列1-烷基-3-甲基咪唑四氟硼酸盐（[C2～7mim]BF4）及六氟磷酸盐（[C4～7mim]PF6）室温离子液体，并通过核磁氢谱、红外光谱、质谱等手段对其进行了结构表征；采用Wilhelmy白金板法，在293-338K范围内测定了离子液体的表面张力，测试结果显示，同类离子液体表面张力y随温度的升高而线性下降，同种离子液体的表面张力呈现出较宽的变化范围，如293K下，表面张力值从[C2mim]BF4的50．4mJ／m^2到[C7mim]BF4的36．1mJ／m^2．最后对离子液体的表面性能进行了讨论．

英文摘要：

A series of room temperature ionic liquids based on 1-CnH2n＋1-3-methylimidazolium （[Cnmim]） with two kinds of fluorinated anions （ BF4 and PF6 ） （n=2-7; 4-7, respectively） were synthesized, and the structures were characterized and confirmed by ^1H NMR, IR and MS. Surface tensions were measured using a Wilhelmy plate apparatus over a wide temperature range （293-338 K）. The results show that there is a linear decrease of surface tension with increasing temperature. The values of surface tension span an unusually wide range for compounds of similar structure, from 50.4 mJ/m^2 （[C2mim]BF4） to 36.1 mJ/m^2 （[C7mim]BF4） at 298 K. Surface properties of the series of synthesized ionic liquids were also discussed.