Applying the inductive effect for synthesizing low-melting and low-viscosity imidazolium-based ionic liquids

Area of Science:

• Materials Science
• Chemistry
• Physical Chemistry

Background:

• Ionic liquids (ILs) are salts that are liquid at low temperatures.
• Their properties, such as viscosity and melting point, are tunable.
• Hydrogen bonding significantly influences the physical properties of molecular liquids.

Purpose of the Study:

• To propose a synthesis strategy for introducing strong, directional, and localized H-bonds into imidazolium-based ionic liquids.
• To investigate the effect of these H-bonds on the physical properties of ionic liquids.

Main Methods:

• Utilizing the inductive effect for molecular design.
• Synthesizing novel imidazolium-based ionic liquids with tailored H-bonding capabilities.
• Characterizing the melting points and viscosities of the synthesized ILs.

Main Results:

• A successful strategy to incorporate strong, directional, and localized H-bonds into imidazolium-based ILs was demonstrated.
• The synthesized ILs exhibited reduced melting points compared to conventional ILs.
• A significant decrease in viscosity was observed in the functionalized ILs.

Conclusions:

• The proposed method effectively modifies ionic liquids through controlled hydrogen bonding.
• This approach offers a pathway to "fluidize" ionic liquids, enhancing their applicability.
• The findings pave the way for designing low-viscosity, low-melting-point ionic liquids.