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Ion Exchange

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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...

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When atoms gain or lose electrons to achieve a more stable electron configuration they form ions. Ionic bonds are electrostatic attractions between ions with opposite charges. Ionic compounds are rigid and brittle when solid and may dissociate into their constituent ions in water. Covalent compounds, by contrast, remain intact unless a chemical reaction breaks them.
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Ions are atoms or molecules bearing an electrical charge. A cation (a positive ion) forms when a neutral atom loses one or more electrons from its valence shell, and an anion (a negative ion) forms when a neutral atom gains one or more electrons in its valence shell. Compounds composed of ions are called ionic compounds (or salts), and their constituent ions are held together by ionic bonds: electrostatic forces of attraction between oppositely charged cations and anions.

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Supported Ionic Liquids and their Applications in Organic Transformations.

Ambika¹, Pradeep Pratap Singh²

¹Department of Chemistry, Hansraj College, University of Delhi, Delhi, India.

Current Organic Synthesis

|October 21, 2022

Summary

Supported ionic liquids (SILs) offer a greener alternative to volatile organic solvents, combining heterogeneous and homogeneous catalysis benefits. These stable, reusable materials enhance various organic transformations with easy product isolation.

Keywords:

Supported ionic liquids cross-coupling reaction designer solvent green catalyst organic transformations pollutants

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Area of Science:

Green Chemistry
Materials Science
Catalysis

Background:

Ionic liquids (ILs) are emerging as environmentally friendly solvents, replacing hazardous volatile organic compounds.
Supported ionic liquids (SILs) are gaining attention for their unique properties, synthesized by immobilizing ILs on solid supports.
SILs bridge the gap between heterogeneous and homogeneous catalysis, offering combined advantages.

Approach:

This review discusses the classification and preparation methods of SILs.
It explores the diverse applications of SILs in organic synthesis.
Focus is placed on SILs' role in reactions like cross-coupling, oxidation, reduction, and biocatalysis.

Key Points:

SILs exhibit enhanced stability, reusability, and recoverability compared to traditional solvents.
They facilitate easy product isolation and prevent IL leaching.
SILs demonstrate versatility in catalyzing a wide range of organic transformations.

Conclusions:

Supported ionic liquids represent a significant advancement in sustainable chemistry.
Their unique properties and broad applicability make them valuable tools for organic synthesis.
SILs offer a promising route towards greener and more efficient chemical processes.