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Solvent Polarities and Kamlet−Taft Parameters for Ionic Liquids Containing a Pyridinium Cation

2008; American Chemical Society; Volume: 112; Issue: 5 Linguagem: Inglês

10.1021/jp076895k

1520-6106

Jong‐Min Lee, Sebastian Ruckes, John M. Prausnitz,

Chemical and Physical Properties in Aqueous Solutions

Five recently synthesized pyridinium ionic liquids [(1-butyl-4-methylpyridinium, 1-octylpyridinium, 1-octyl-2-methylpyridinium, 1-octyl-3-methylpyridinium, and 1-octyl-4-methylpyridinium, all with anion bis(trifluoromethylsulfonyl)imide], were investigated to establish the influence of substituting a methyl group and the influence of alkyl chain length on the cation on polarity ETN and on three Kamlet−Taft parameters: dipolarity/polarizabilty (π*), hydrogen-bond acidity (α), and hydrogen-bond basicity (β). Experimental measurements cover the range 25 to 65 °C.