Influence of the anion on the electrical conductivity and glass formation of 1-butyl-3-methylimidazolium ionic liquids.
Six ionic liquids based on the 1-butyl-3-methylimidazolium cation have been studied. As anions Cl(-), Br(-), I(-), [NCS](-), [N(CN)(2)](-), and [BF(4)](-) were selected. The electrical conductivities were determined between 173 and 393 K based on impedance measurements in the frequency range from 0.1 to 10(7) Hz. The electrical conductivity increases, whereas the glass transition temperature, the fragility, and the low temperature activation energy decrease with increasing anion size. The results can be understood from the changing anion-cation interaction strength with changing anion size and from the energy landscape interpretation of the glass transition dynamics.
Leys
Jan
J
Laboratorium voor Akoestiek en Thermische Fysica, Departement Natuurkunde en Sterrenkunde, Katholieke Universiteit Leuven, Celestijnenlaan 200D, P.O. Box 2416, B-3001 Leuven, Belgium. jan.leys@fys.kuleuven.be
Rajesh
Ravindran Nair
RN
Menon
Preethy Chirukandath
PC
Glorieux
Christ
C
Longuemart
Stéphane
S
Nockemann
Peter
P
Pellens
Michael
M
Binnemans
Koen
K