Thermodynamic Properties of 1-Butyl-3 Methylimidazolium Hexafluorophosphate in the Condensed State

Published

May 1, 2004

Author(s)

Gennady J. Kabo, Andrey V. Blokhin, Y Paulechka, Andrey G. Kabo, M P. Shymanovich, Joe W. Magee

Abstract

Thermodynamic functions for 1-butyl-3-methyllumidazolium hexafluorophosphate ([C4mim][PF6] were reported in a range of temperatures from (5 to 550) K, based on new measurements by calorimetry. Heat capacities of the crystal, glass and liquid phases for [C4mim][PF6]) were measured with a pair of calorimeters. A vacuum-jacketed adiabatic calorimeter was used at temperatures between (5 and 310) K and a triple-heat bridge scanning calorimeter was used from (300 to 550) K. With the adiabatic calorimeter, both the fusion Tfus=283.5 51 K, delta H= 19.60 kj/mol and the glass transition Tg=190.6 K were observed. The purity of [C4mim] [PF6] sample was determined t obe 99.56 mo % by a fractional melting analysis. Densities of the liquid were measured in a range of temperatures from (298 to 353) K with a pycnometer equipped with a capillary neck. An unexpected endothermal transition, with a very small enthalpy change of 0.25 J/g, was observed in a range of temperatures from (394 to 412) K heat capacity jumps were determined at the glass transition delta-C=81.6 J/(K mol) and fusion delta-C=44.8 J/(K mol) and the observed entropy change at fusion is delta-S(283.51 K) =69.23 J(Kmol).

Citation

Journal of Chemical and Engineering Data

Volume

49

Issue

No. 3

Pub Type

Journals

Citation

Kabo, G. , Blokhin, A. , Paulechka, Y. , Kabo, A. , Shymanovich, M. and Magee, J. (2004), Thermodynamic Properties of 1-Butyl-3 Methylimidazolium Hexafluorophosphate in the Condensed State, Journal of Chemical and Engineering Data (Accessed May 16, 2025)