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Ionic Bonding and Electron Transfer

Ionic Bonding and Electron Transfer

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.

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...

Formation of Complex Ions

Formation of Complex Ions

A type of Lewis acid-base chemistry involves the formation of a complex ion (or a coordination complex) comprising a central atom, typically a transition metal cation, surrounded by ions or molecules called ligands. These ligands can be neutral molecules like H2O or NH3, or ions such as CN− or OH−. Often, the ligands act as Lewis bases, donating a pair of electrons to the central atom. These types of Lewis acid-base reactions are examples of a broad subdiscipline called coordination...

Alkyl Halides

Alkyl Halides

Structural Properties
Alkyl halides are halogen-substituted alkanes wherein one or more hydrogen atoms of an alkane is replaced by a halogen atom such as fluorine, chlorine, bromine, or iodine. The carbon atom in an alkyl halide is bonded to the halogen atom, which is sp3-hybridized and exhibits a tetrahedral shape.
Unlike alkyl halides, compounds in which a halogen atom is bonded to an sp2 -hybridized carbon atom of a carbon-carbon double bond (C=C) are called vinyl halides. Whereas aryl...

Electrophilic Addition to Alkynes: Halogenation

Electrophilic Addition to Alkynes: Halogenation

Introduction
Halogenation is another class of electrophilic addition reactions where a halogen molecule gets added across a π bond. In alkynes, the presence of two π bonds allows for the addition of two equivalents of halogens (bromine or chlorine). The addition of the first halogen molecule forms a trans-dihaloalkene as the major product and the cis isomer as the minor product. Subsequent addition of the second equivalent yields the tetrahalide.

Ionic Association

Ionic Association

The ionic association is the association of oppositely charged ions in an electrolyte solution to form ion pairs. Bjerrum defined ion pairs as two oppositely charged ions whose electrostatic attraction exceeds the thermal energy of the system, typically expressed as 2kT. Electrostatic attraction depends on ionic charge, separation distance, and the dielectric constant of the medium. Thermal energy, represented by kT, reflects the tendency of ions to move independently due to molecular motion.

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Uranium halide complexes in ionic liquids: an electrochemical and structural study.

Maggel Deetlefs¹, Charles L Hussey, Thamer J Mohammed

¹QUILL Centre, David Keir Building, Stranmillis Road, Queen's University of Belfast, Belfast, Northern Ireland, UK BT9 5AG. quill@qub.ac.uk

Dalton Transactions (Cambridge, England : 2003)

|May 12, 2006

Summary

The electrochemistry of uranium salts [emim]2[UBr6] and [emim]2[UO2Br4] was studied in ionic liquids. Different reduction processes were observed in basic and acidic conditions, with similar species forming in acidic media.

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Area of Science:

Electrochemistry
Inorganic Chemistry
Materials Science

Background:

Ionic liquids offer unique electrochemical environments.
Uranium bromide complexes present interesting redox behavior.

Purpose of the Study:

Investigate the electrochemistry of [emim]2[UBr6] and [emim]2[UO2Br4] in bromoaluminate ionic liquids.
Determine the redox pathways and products in different ionic liquid media.
Re-evaluate solid-state structures of related uranium chloride salts.

Main Methods:

Electrochemical studies using a glassy carbon disc electrode.
Investigation in both basic and acidic bromoaluminate(III) ionic liquids.
Solid-state structure analysis using a new statistical model.

Main Results:

[emim]2[UBr6] showed a one-electron reversible reduction in basic ionic liquid.
[emim]2[UO2Br4] underwent a two-electron irreversible reduction with oxide transfer in basic ionic liquid.
Both salts formed the same electroactive species upon dissolution in acidic ionic liquid.

Conclusions:

The electrochemical behavior of uranium bromide complexes is dependent on the ionic liquid's acidity.
Acidic bromoaluminate ionic liquids facilitate the formation of a common electroactive uranium species.
Re-evaluation of uranium chloride salt structures provides insights into solid-state interactions.