Physicochemical properties and toxicities of hydrophobicpiperidinium and pyrrolidinium ionic liquids Page: 1 of 15
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Physicochemical properties and toxicities of hydrophobic
piperidinium and pyrrolidinium ionic liquids
Justin Salminen'3, Nicolas Papaiconomoui,2, R. Anand Kumari, Jong-Min Leei'2,
John Kerr3, John Newmani'3 and John M. Prausnitzi,2
'Department of Chemical Engineering, University of California, Berkeley,
CA 94720-1462, USA.
2Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley,
CA 94720, USA.
3Environmental Energy Technology Division, Lawrence Berkeley National Laboratory,
Berkeley, CA 94720, USA.
Some properties are reported for hydrophobic ionic liquids (IL) containing 1-methyl-1-propyl
pyrrolidinium [MPPyrro]+, 1-methyl-i-butyl pyrrolidinium [MBPyrro]+, 1-methyl-i-propyl
piperidinium [MPPip]+, 1-methyl-1-butyl piperidinium [MBPip]+, 1-methyl-i-
octylpyrrolidinium [MOPyrro]+ and 1-methyl-i-octylpiperidinium [MOPip]+ cations. These
liquids provide new alternatives to pyridinium and imidazolium ILs. High thermal stability of
an ionic liquid increases safety in applications like rechargeable lithium-ion batteries and
other electrochemical devices. Thermal properties, ionic conductivities, viscosities, and
mutual solubilities with water are reported. In addition, toxicities of selected ionic liquids
have been measured using a human cancer cell-line. The ILs studied here are sparingly
soluble in water but hygroscopic. We show some structure-property relationships that may
help to design green solvents for specific applications. While ionic liquids are claimed to be
environmentally-benign solvents, as yet few data have been published to support these
claims.
Keywords: Ionic liquids, hydrophobic, piperidinium, pyrrolidinium, properties, safety,
toxicity1
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Salminen, Justin; Papaiconomou, Nicolas; Kumar, R. Anand; Lee,Jong-Min; Kerr, John; Newman, John et al. Physicochemical properties and toxicities of hydrophobicpiperidinium and pyrrolidinium ionic liquids, article, June 25, 2007; Berkeley, California. (https://digital.library.unt.edu/ark:/67531/metadc901543/m1/1/: accessed April 18, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.