Extraction of organic impurities using 1-butyl-3-methylimidazolium hexafluorophosphate [BMIM][PF 6 ]

Abstract

Alkyl substituents in position 1 of the imidazole ring distinctly affect the hydrophobic properties of the molecule and strengthen its basicity. Hence, 1-alkylimidazoles have been used as extractants of a number of metal ions. Again, a methyl substituent in position 2 of the imidazole ring raises by an order of magnitude the basicity. At the same time, the substituent impedes the formation of the 2-alkylimidazole complexes with metal ions due to the steric effect.@r@nBy the substitution of alkyl groups in position 1 or 2 of the imidazole ring it is possible to program the extraction properties of extractants and to control the selectivity of extraction. © 2004, Versita. All rights reserved. © 2008, Versita. All rights reserved.