Thermophysical properties of 1-propyronitrile- 3-alkylimidazolium bromide ionic liquids at Temperatures (293.15 to 353.15) K

Abstract
In the present work, a series of 1-propyronitrile-3-alkylimidazolium bromide ionic liquids ([C2CN Cnim]Br, where n = 4, 6, 8 and 10) were synthesized and characterized using FTIR, NMR and elemental analysis. Physical properties such as density, viscosity and refractive index are measured and reported for a temperature range of (293.15 to 353.15) K and at atmospheric pressure. The influence of the alkyl chain on these properties is discussed. The present synthesized ionic liquids show a weak temperature dependency on the thermal expansion coefficient.