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Solvent-mediated molar conductivity of protic ionic liquids
Sachin Thawarkar1, Nageshwar D Khupse, Anil Kumar
1Physical & Materials Chemistry Division, CSIR - National Chemical Laboratory, Pune 411 008, India. a.kumar@ncl.res.in.
Physical Chemistry Chemical Physics : PCCP
|November 20, 2014
Summary
Molar conductivity of protic ionic liquids (PILs) decreases with concentration. Solvent properties and PIL structure significantly influence ionic association, impacting conductivity and diffusion.
Area of Science:
- Physical Chemistry
- Materials Science
- Electrochemistry
Background:
- Ionic liquids (ILs) are salts that are liquid below 100°C.
- Protic ionic liquids (PILs) are a subclass of ILs with potential applications in various fields.
- Understanding the conductivity of PILs in molecular solvents is crucial for their application.
Purpose of the Study:
- To measure and analyze the molar conductivity of PILs in different molecular solvents.
- To correlate conductivity data with the structural properties of PILs and solvents.
- To investigate the factors influencing ionic association in PIL solutions.
Main Methods:
- Molar conductivity (Λm) measurements at 298.15 K.
- Determination of limiting molar conductivities (Λm(0)) using a least squares method.
- Analysis of diffusion coefficients (D(0)) and transport numbers (t).
Main Results:
- Λm decreases with increasing PIL concentration.
- Polar protic solvents exhibit lower ionic association than polar aprotic solvents due to hydrogen bond donating ability.
- Alkyl chain length on PIL anions significantly affects ionic association.
Conclusions:
- Ionic association in PILs is influenced by solvent polarity, hydrogen bonding, and anion structure.
- Conductivity and diffusion are dependent on the hydrodynamic radius of PIL anions.
- Walden plots of temperature-dependent conductivity data provide insights into ionic association.
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