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Chromatographic determination of hydrophobicity of dialkylimidazolium ionic liquids using selected stationary phase
Author(s) -
Studzińska Sylwia,
Buszewski Bogusław
Publication year - 2012
Publication title -
journal of separation science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.72
H-Index - 102
eISSN - 1615-9314
pISSN - 1615-9306
DOI - 10.1002/jssc.201100432
Subject(s) - ionic liquid , chemistry , alkyl , stationary phase , chromatography , ionic bonding , phase (matter) , carbon number , organic chemistry , ion , catalysis
The determination of hydrophobicity of ionic liquids (ILs) is essential for the reason that some of these salts’ classes are of toxic character. The conventional shake flask method of log P estimation fails in case of ILs. This is connected with their ionic character. Therefore other methods need to be developed and optimized. Chromatographic methods seem to be the proper ones. For that reason, several specific stationary phases (octadecyl, octyl, aminopropyl, alkylamide, cholesterolic, immobilized artificial membrane, phenyl) have been used for the determination of log k w of alkylimidazolium ILs. Then, log k w were used for the correlation with calculated log P for IL s. Depending on applied calculation procedure, high values of determination coefficient were obtained for alkyl‐based silica stationary phases or for more specific column packing. This result is very promising as it has already been proven that several, different in nature, stationary phases can be successfully used for estimation of log P of IL cations.