Preparation and characterization of amino or carboxyl-functionalized ionic liquids

New functionalized ionic liquids, 1-carboxylmethyl-3-methylimimidazolium hexafluorophosphate or fluoborate and 1-aminoethyl-3-methylimimidazolium hexafluorophosphate or fluoborate have been synthesized and investigated. The obtained amino or carboxyl-functionalized ionic liquids were all characterized by FT-IR, H-1 NMR and MS (ESI) and their properties such as freezing point, viscosity, solubility, specific gravity, surface tension, and interfacial tension were also determined. (c) 2006 Yue Qin Cai. Published by Elsevier B.V. on behalf of Chinese Chemical Society. All rights reserved.