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Effect of the Number, Position and Length of Alkyl Chains on the Physical and Thermal Properties of Poly-Substituted Pyridinium Ionic Liquids
1 , 2 , 3 , 4 , 5 , * 1
1  Department of Organic Chemistry, University of Vigo, Vigo, Spain
2  Tekniker, Eibar, Spain
3  Department of Chemical Engineering, University of Porto, Portugal
4  LSRE-Laboratory of Separation and Reaction Engineering, University of Porto, Porto 4200-465, Portugal;
5  Applied Physic Department, University of Santiago de Compostela, Santiago de Compostela, Spain

Abstract: Five ionic liquids derived from pyridinium cation polysubstituted with different alkyl chains were synthesized. Their thermal properties (phase transition and decomposition temperatures) and physical properties (density, speed of sound, refractive index and viscosities) were evaluated. The effect of the number of alkyl chains, their length and their position on the pyridinium ring over the studied physical and thermal properties is also analyzed and discussed.
Keywords: pyridinium, ionic liquids, physical properties, thermal properties