How ionic are room-temperature ionic liquids? An indicator of the physicochemical properties
Article Abstract:
The quantitative information on the formation on ionic aggregates in room-temperature Ionic Liquids (RTILs) based on the ratios of molar conductivity values ([A.sub.imp]/[A.sub.NMR], where [A.sub.imp] is the molar conductivity obtained by electrochemical impedance measurements and [A.sub.NMR] is that calculated from the pulse-field-gradient spin-echo NMR (PGSE-NMR) ionic self-diffusion coefficients and the Nernst-Einstein equation is reported. A decrease in ([C.sub.eff]) effective ionic concentration of the RTILs is well correlated with the normal boiling point and distillation rate, whereas the liquid-state dynamics is controlled by a subtle balance between the electrostatic and other intermolecular forces.
Publication Name: Journal of Physical Chemistry B
Subject: Chemicals, plastics and rubber industries
ISSN: 1520-6106
Year: 2006
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Physicochemical properties and structures of room-temperature ionic liquids. 3. Variation of cationic structures
Article Abstract:
A series of room-temperature ionic liquids (RTILs) were prepared with different cationic structures, combined with an anion and the thermal property, density, self-diffusion coefficients of the cation and anion, viscosity, ionic conductivity were measured over a wide temperature range. It was found that the relative cationic and anionic self-diffusion coefficients for the RTILs appear to be influenced by the shape of cationic structure and that the microscopic ion dynamics and ionic state significantly contributes to the macroscopic physicochemical properties of the ionic liquids.
Publication Name: Journal of Physical Chemistry B
Subject: Chemicals, plastics and rubber industries
ISSN: 1520-6106
Year: 2006
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Magnitude and directionality of interaction in ion pairs of ionic liquids: Relationship with ionic conductivity
Article Abstract:
The intermolecular interaction energies of nine ion pairs of room temperature ionic liquids were studied by MP2/6-311G** level ab initio calculations. Experimental ionic conductivities show that the magnitude and directionality of the interaction energy of the ion pairs play a crucial role in determining the ionic/dissociation dynamics in the ionic liquids.
Publication Name: Journal of Physical Chemistry B
Subject: Chemicals, plastics and rubber industries
ISSN: 1520-6106
Year: 2005
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