Peculiar behavior of azolium azolate energetic ionic liquids

N. V. Pogodina, E. Metwalli, P. Müller-Buschbaum, K. Wendler, R. Lungwitz, S. Spange, J. L. Shamshina, R. D. Rogers, Ch Friedrich

Research output: Contribution to journalArticlepeer-review

5 Scopus citations

Abstract

We present studies of molecular dynamics and interactions in azolium azolate energetic ionic liquids (ILs) by utilizing a variety of physical methods. We observe peculiar rheological behavior for these ILs, which deviates from the one expected for molecular glass-formers. Major peculiarities include high elasticity in the low-frequency zone, peculiar van Gurp plots, and failure of time temperature superposition. We attribute these peculiarities to specific interactions in the nitrogen-rich planar rings of azolate ILs. X-ray scattering measurements reveal a "nanometer" ordered organization in azolium azolates. High values of Kamlet-Taft polarity parameters indicate high probability and strength of hydrogen bond interactions in azolate ILs. This conclusion is also supported by ab initio calculations. Our next effort is to break/enhance existing interactions in nitrogen-rich ILs by adding a "H-acceptor". This will allow better understanding of the nature of interactions in azolium azolates and eventually their control.

Original languageEnglish
Pages (from-to)2571-2576
Number of pages6
JournalJournal of Physical Chemistry Letters
Volume2
Issue number20
DOIs
StatePublished - 20 Oct 2011

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