Solvent polarities and kamlet-taft parameters for ionic liquids containing a pyridinium cation.
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 ET(N) and on three Kamlet-Taft parameters: dipolarity/polarizabilty (pi*), hydrogen-bond acidity (alpha), and hydrogen-bond basicity (beta). Experimental measurements cover the range 25 to 65 degrees C.
Lee
Jong-Min
JM
Department of Chemical Engineering, University of California, Berkeley, California 94720-1462, USA. JMLee@lbl.gov
Ruckes
Sebastian
S
Prausnitz
John M
JM
D002412:Cations / Q000737:chemistry; D055598:Chemical Phenomena; D002627:Chemistry, Physical; D004396:Coloring Agents / Q000737:chemistry; D006860:Hydrogen Bonding; D006863:Hydrogen-Ion Concentration; D007202:Indicators and Reagents; D011726:Pyridinium Compounds / Q000737:chemistry*; D012997:Solvents; D013696:Temperature
D002412:Cations; D004396:Coloring Agents; D007202:Indicators and Reagents; D011726:Pyridinium Compounds; D012997:Solvents