Pyrrolidinium imides : a new family of molten salts and conductive plastic crystal phases
MacFarlane, D. R., Meakin, P., Sun, J., Amini, N. and Forsyth, M. 1999, Pyrrolidinium imides : a new family of molten salts and conductive plastic crystal phases, Journal of physical chemistry B : condensed matter, materials, surfaces, interfaces and biophysical, vol. 103, no. 20, pp. 4164-4170.
Journal of physical chemistry B : condensed matter, materials, surfaces, interfaces and biophysical
American Chemical Society
Place of publication
A new family of molten salts is reported, based on the N-alkyl, N-alkyl pyrrolidinium cation and the bis(trifluoromethane sulfonyl)imide anion. Some of the members of the family are molten at room temperature, while the smaller and more symmetrical members have melting points around 100 °C. Of the room-temperature molten salt examples, the methyl butyl derivative exhibits the highest conductivity; at 2 × 10-3 S/cm this is the highest molten salt conductivity observed to date at room temperature among the ammonium salts. This highly conductive behavior is rationalized in terms of the role of cation planarity. The salts also exhibit multiple crystalline phase behavior below their melting points and exhibit significant conductivity in at least their higher temperature crystal phase. For example, the methyl propyl derivative (mp = 12 °C) shows ion conductivity of 1 × 10-6 S/cm at 0 °C in its higher temperature crystalline phase.
Field of Research
039999 Chemical Sciences not elsewhere classified
Socio Economic Objective
970103 Expanding Knowledge in the Chemical Sciences