Is the liquid or the solid phase responsible for the low melting points of ionic liquids? Alkyl-chain-length dependence of thermodynamic properties of [C(n)mim][Tf2N]

Shimizu Y; Ohte Y; Yamamura Y; Saito K

Chemical Physics Letters, Vol.470, No.4-6, 295-299, 2009

DOI10.1016/j.cplett.2009.01.085 Export Citation

Is the liquid or the solid phase responsible for the low melting points of ionic liquids? Alkyl-chain-length dependence of thermodynamic properties of [C(n)mim][Tf2N]

Shimizu Y, Ohte Y, Yamamura Y, Saito K

To establish the alkyl-chain-length dependences of thermodynamic properties of typical ionic liquids [C(n)mim][Tf2N], the heat capacities of compounds with n = 2 and 18 were measured by adiabatic calorimetry. The comparison with other ionic liquids and typical molecular substances reveals that the low melting point of [C(n)mim][Tf2N] with a short alkyl chain mainly originate in the large fusion entropy arising from the low entropy of the crystalline phase. (C) 2009 Elsevier B. V. All rights reserved.