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Ion Exchange

Ion Exchange

Ion exchange chromatography separates charged molecules from a solution by reversibly exchanging them with mobile, or 'active', ions associated with the oppositely charged stationary phase. This method can be used to separate ions, soften and deionize water, and purify solutions. The polymers comprising the ion-exchange column are high-molecular-weight and chemically stable polymers, crosslinked to be porous and essentially insoluble. They are also functionalized with either acidic or basic...

Ionic Crystal Structures

Ionic Crystal Structures

Ionic crystals consist of two or more different kinds of ions that usually have different sizes. The packing of these ions into a crystal structure is more complex than the packing of metal atoms that are the same size.
Most monatomic ions behave as charged spheres, and their attraction for ions of opposite charge is the same in every direction. Consequently, stable structures for ionic compounds result (1) when ions of one charge are surrounded by as many ions as possible of the opposite...

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From Molecules to Materials: Engineering New Ionic Liquid Crystals Through Halogen Bonding

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Published on: March 24, 2018

[Sb10Se10]2+, a heteronuclear polycyclic polycation from a room-temperature ionic liquid.

Ejaz Ahmed¹, Anna Isaeva, Andy Fiedler

¹Department of Chemistry and Food Chemistry, Technische Universität Dresden, Dresden, Germany.

Chemistry (Weinheim an Der Bergstrasse, Germany)

|May 7, 2011

Summary

Researchers synthesized a novel antimony-selenium polycation, [Sb(10)Se(10)](2+), using ionic liquids. This compound exhibits semiconducting properties and unique bonding characteristics, expanding knowledge in inorganic chemistry.

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Area of Science:

Inorganic Chemistry
Materials Science
Solid-State Chemistry

Background:

Ionic liquids offer unique reaction media for synthesizing novel inorganic compounds.
Antimony and selenium chemistry is rich, with potential for new materials.

Purpose of the Study:

To synthesize and characterize a novel mixed antimony-selenium polycation.
To investigate the structural, bonding, and electronic properties of the new compound.

Main Methods:

Reaction of antimony, selenium, and selenium(IV) chloride in [BMIM]Cl/AlCl(3) ionic liquid.
Single-crystal X-ray diffraction for structural determination.
Quantum chemical calculations for bonding and electronic structure analysis.

Main Results:

Synthesis of air-sensitive [Sb(10)Se(10)][AlCl(4)](2) crystals.
Discovery of the first mixed antimony/selenium polycation, [Sb(10)Se(10)](2+).
Prediction of semiconducting behavior and analysis of covalent/ionic bonding contributions.

Conclusions:

The Zintl concept is applicable to this heteronuclear polycation.
The new compound presents interesting bonding and electronic properties.
This work expands the family of polycationic antimony-chalcogenide materials.