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Conduction through Viscoelastic Phase in a Redox-Active Ionic Liquid at Reduced Temperatures

Type of publication Peer-reviewed
Publikationsform Original article (peer-reviewed)
Publication date 2012
Author Thorsmølle Verner K., Topgaard Daniel, Brauer Jan C., Zakeeruddin Shaik M., Grätzel Michael, Moser Jacques-E.,
Project THz time-domain spectroscopy of unconventional photonic and charge transport systems
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Original article (peer-reviewed)

Journal Advanced Materials
Volume (Issue) 24
Page(s) 781 - 784
Title of proceedings Advanced Materials
DOI 10.1002/adma.201104230

Open Access


The phase diagram of propyl,methyl-imidazolium iodide ionic liquid (PMII) is examined as a function of temperature and iodine concentration. Beyond a threshold concentration of 3.9 M, the formation of higher polyiodides gives rise to a viscoelastic phase upon cooling. Despite of the very high viscosity of such polyiodide- containing PMII melts a strikingly high conductivity is maintained through Grotthuss-type bond exchange and ionic conduction.