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X-ray diffraction study of ionic liquid based mixtures.

Yusuke Imai¹, Hiroshi Abe, Yukihiro Yoshimura

¹Department of Materials Science and Engineering, and Department of Applied Chemistry, National Defense Academy, Yokosuka 239-8686, Japan.

The Journal of Physical Chemistry. B

|January 28, 2009

Summary

This summary is machine-generated.

Additives like water and benzene induce diverse crystal structures and superstructures in N,N-diethyl-N-methyl-N-2-methoxyethylammonium tetrafluoroborate ([DEME][BF(4)]). These additives cause significant molecular interaction changes and volume contraction in the ionic liquid.

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Area of Science:

Materials Science
Crystallography
Ionic Liquids

Background:

N,N-diethyl-N-methyl-N-2-methoxyethylammonium tetrafluoroborate ([DEME][BF(4)]) is an ionic liquid with unique structural properties.
Understanding the influence of additives on ionic liquid crystal structures is crucial for materials design.

Purpose of the Study:

To investigate the impact of various additives (water, methanol, ethanol, benzene) on the crystal structures of [DEME][BF(4)] using X-ray diffraction.
To analyze the formation of superstructures and their relationship with molecular interactions and volume changes.

Main Methods:

X-ray diffraction analysis was employed to determine the crystal structures of pure [DEME][BF(4)] and its mixtures with additives.
Comparative structural analysis was performed to identify changes in unit cells and the formation of superstructures.

Main Results:

Additives induced various crystal structures and superstructures in [DEME][BF(4)]-based mixtures.
Benzene and water additives led to distinct unit cells and the formation of two types of superstructures, accompanied by volume contraction.
Superstructures arise from orientational or displacive modulations of [DEME][BF(4)] molecules, indicating extensive influence on molecular interactions.

Conclusions:

Even small amounts of additives significantly alter the crystal structure and molecular interactions of [DEME][BF(4)].
The formation of superstructures and volume contraction highlight the sensitivity of ionic liquid frameworks to guest molecules.
Findings provide insights into the structure-property relationships of ionic liquids and their potential for tailored applications.