Octanol/Water Partition Coefficients of Pyridinium-Based Ionic Liquids

摘要

Nine pyridinium-based ionic liquids were synthesised, which include 1-butylpyridinium bromide ([BPYR] [Br]), 1 -hexylpyridinium bromide ([HPYR][Br]), 1-octylpyridinium bromide ([OPYR][Br]), 1-hexylpyridinium bis(trifluoromethylsulfonyl)imide ([HPYR] [NTf2]), 1-octylpyridinium bis(trifluoromefhylsulfonyl)irnide ([OPYR][NTf2]), 1-hexylpyridinium trifluoromethanesulfonate ([HPYR] [TFO]), 1-octylpyridinium trifluoromethanesulfonate ([OPYR][TFO]), 1-hexylpyridinium tetrafluoroborate ([HPYR] [BF4]), 1-octylpyridinium tetrafluoroborate ([OPYR][BF4]). The octanol/water partition coefficients (K_(oWs)) of these pyridinium-based ionic liquids were determined by shake-flask method. It is found mat the pyridinium-based ionic liquids measured in this work are extremely hydrophilic except for [OPYR] [NTf2]. It is also found that K_(ows) of [NTf2] ionic liquids were dependent on the concentration and high ionic liquids concentration in water leads to big K_(ow).