Quasi-Crystalline Behavior of Imidazolium Based Pure Ionic Liquids Over the Extended Pressure Range

Abstract

Based on quasi-crystalline model for liquids, Debye temperature, Bayers number, and Pseudo Gurnasien parameter for three pure Imidazolium based ionic liquids with same anion have been estimated in the elevated pressure range (1.83 MPa -59.59 MPa) and temperature range (298.15 K – 328.15 K). The reasonable values of θD (~ 48.58 K – 56.30 K) are the evidence of existence of effective Debye temperature and quasi-crystalline state in ionic liquids at elevated pressure whereas slight change in the values of these parameters indicate that molecular motion is more sensitive to increase in pressure rather than increase in temperature in the given ionic liquids under study. Marginal change in the values of Debye temperature, Bayers number, and Pseudo Gurnasien parameter with increase in alkyl change of cation indicate that alkyl chain of cation is not accountable to study the quasi-crystalline behavior of the given ILs in the given pressure and temperature range.