Room temperature fast-ion conduction in imidazolium halide salts

Rapid I−/I3− Diffusion in a Molecular‐Plastic‐Crystal Electrolyte for Potential Application in Solid‐State Photoelectrochemical Cells

“…Comparable data for a commonly used liquid [a] The transport number t was calculated from the formula: Communications solvent (acetonitrile) were reported by Matsumoto et al [25] and recently for a gelled ionic liquid by Wang et al [10] The results indicate that the diffusivity of I 3 À in the plastic solid is higher than in the gelled ionic liquid. Diffusivities that are higher in the solid state than in the corresponding liquid state have been observed previously [26] and are related to defect motion in the ordered crystalline lattice. Moreover, D app (I À ) in the plastic crystal based electrolyte is 4.7 times larger than in the gel electrolytes.…”

Thermodynamic properties of 1-alkyl-3-methylimidazolium bromide ionic liquids

“…The enthalpy of fusion for the substance from this work essentially exceeds the values of 15.7 kJ AE mol À1[24] and 15.5 kJ AE mol À1[25] determined by d.s.c.…”

Thermal analysis, nuclear magnetic resonance spectroscopy, and impedance spectroscopy of N,N-dimethyl-pyrrolidinium iodide: An ionic solid exhibiting rotator phases

“…If the packing is loose then molecular rotations could be relatively easy and the presence of vacancies would allow hopping of the cations between sites. 21 If we regard the iodide anions to be immobile in the lattice, then it follows that, though vacancies may facilitate the movement of single cations, in order for a plastic deformation to occur, the anions need to be able to move as well. It has been shown that, in many plastic crystals, the anions and cations are equally mobile.…”

“…This material has displayed some of the highest solid state conductivity values measured to date in organic materials, and this was linked to the diffusion of the imidazolium cation. 21 A similarity between P 11 I and EtMeImI is the tunneled crystal structure. The anions can be regarded as more or less immobile, creating a static matrix in which the cations are free to move in the rotator 200 66 22 230 66 18 240 60 18 280 50 18 360 43 16 370¯11 470¯10 490¯6 518¯2 phases.…”