Thermal, rheological, and ion-transport properties of phosphonium-based ionic liquids

Matthew D. Green, Christian Schreiner, Timothy E. Long

Research output: Contribution to journalArticlepeer-review

52 Scopus citations


Phosphonium-based ionic liquids with varying counteranions from commercially available ionic liquid precursors enabled tunable viscosity, ionic conductivity, and thermal stability. Thermogravimetric analysis revealed a relationship between thermal stability and anion composition where anions with lower basicity remained stable to higher temperatures. Determination of glass transition temperatures and melting temperatures using differential scanning calorimetry revealed supercooling, crystallization, and dependence on anion composition. Rheological and ionic conductivity measurements determined the temperature-dependence of the viscosity and ionic conductivity of the phosphonium-based ionic liquids. Arrhenius analyses of conductivity and viscosity provided activation energies, which showed a decrease toward larger, more delocalized anions. An assessment according to the Walden plot displayed their efficacy relative to other ionic liquids.

Original languageEnglish (US)
Pages (from-to)13829-13835
Number of pages7
JournalJournal of Physical Chemistry A
Issue number47
StatePublished - Dec 1 2011
Externally publishedYes

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry


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