The volatilities and conductivities of ionic liquids - GC-MS methodology and preliminary studies of acetic acid -base systems

摘要

Gas chromatography -mass spectrometry studies of the headspaces above the binary systems pyridine (bp 115 deg C)-acetic acid (bp 116 deg C),1-methylimidazole (bp 198 deg C)-acetic acid,and triethylamine (bp 89 deg C)-1 acetic acid show both components in the first case,acetic acid only in the second,and triethylamine only in the third.Negative deviations from Raoult's law are confirmed and proton transfer is evidenced by the downfield shift of the acidic proton as the addition of base proceeds.Specific conductances >2 mS cm~(-1)are found over wide composition ranges for all three systems with values >8 mS cm~(-1)at high (>2)mole ratios of acetic acid,suggesting the formation of acetatohydrogenate ionic liquids.