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Ionic liquids based on dicyanamide anion: influence of structural variations in cationic structures on ionic
Yukihiro Yoshida1, Osamu Baba, Gunzi Saito
1Division of Chemistry, Graduate School of Science, and Research Center for Low Temperature and Materials Sciences, Kyoto University, Kyoto 606-8502, Japan. yoshiday@kuchem.kyoto-u.ac.jp
The Journal of Physical Chemistry. B
|May 4, 2007
Summary
Ionic liquids with dicyanamide anions were synthesized and studied. Alkyl chain length impacts fluidity and conductivity, while cation structure influences ion dissociation and conductivity in these novel materials.
Area of Science:
- Materials Science
- Electrochemistry
- Physical Chemistry
Background:
- Ionic liquids (ILs) are salts that are liquid at or near room temperature.
- Their unique properties make them suitable for various applications, including electrolytes and solvents.
- Dicyanamide-based ILs offer tunable properties based on cation and anion selection.
Purpose of the Study:
- To synthesize and characterize a series of dicyanamide-based ionic liquids.
- To investigate the influence of cation structure (alkyl chain length, ring system) on IL properties.
- To explore the relationship between structure, ion association, and transport properties.
Main Methods:
- Synthesis of dicyanamide-based ionic liquids with varying cations.
- Measurement of thermal properties, density, electrochemical window, viscosity, and ionic conductivity.
- Solvatochromic effect analysis and Walden rule deviation assessment.
Main Results:
- 1,3-dimethylimidazolium salt exhibited the highest ionic conductivity (3.6 x 10^-2 S cm^-1).
- Increased alkyl chain length reduced fluidity and conductivity due to enhanced ion association.
- Ethyl-containing heterocyclic cations (imidazolium, pyrazolium, pyrrolidinium) showed room temperature ionic liquid behavior.
- Ionic conductivity order (EMI > PY(12) > EMP) differed from fluidity order (EMI > EMP > PY(12)) due to ion dissociation in PY(12).
- Binary mixtures of EMI-based ILs showed linear conductivity decrease with increasing C(CN)3 content.
Conclusions:
- Cation structure significantly impacts the physicochemical and electrochemical properties of dicyanamide-based ionic liquids.
- Ion association and dissociation play crucial roles in determining ionic conductivity.
- These findings provide insights for designing tailored ionic liquids for specific applications.
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