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Related Concept Videos

Trends in Lattice Energy: Ion Size and Charge02:54

Trends in Lattice Energy: Ion Size and Charge

An ionic compound is stable because of the electrostatic attraction between its positive and negative ions. The lattice energy of a compound is a measure of the strength of this attraction. The lattice energy (ΔHlattice) of an ionic compound is defined as the energy required to separate one mole of the solid into its component gaseous ions. For the ionic solid sodium chloride, the lattice energy is the enthalpy change of the process:
Lattice Energies of Ionic Crystals01:27

Lattice Energies of Ionic Crystals

Lattice energy represents the energy released when gaseous cations and anions combine to form an ionic solid, reflecting the strength of electrostatic interactions within the crystal. This process is fundamentally governed by Coulombic attraction between oppositely charged ions, where the potential energy varies inversely with the interionic distance and directly with the product of ionic charges. As ions approach one another, the electrostatic energy becomes increasingly negative, indicating a...
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Metallic Solids

Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and malleability. Many...
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Crystalline solids are divided into four types: molecular, ionic, metallic, and covalent network based on the type of constituent units and their interparticle interactions.
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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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The structure of a crystalline solid, whether a metal or not, is best described by considering its simplest repeating unit, which is referred to as its unit cell. The unit cell consists of lattice points that represent the locations of atoms or ions. The entire structure then consists of this unit cell repeating in three dimensions. The three different types of unit cells present in the cubic lattice are illustrated in Figure 1.
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A computational study of lithium cuprate mixed aggregates.

Chau Nguyen Duy Khiem1, Le Ngoc Thach, Takanori Iwasaki

  • 1Department of Organic Chemistry, University of Science, Vietnam National University , 227 Nguyen Van Cuu, District 5, Ho Chi Minh City, Vietnam.

The Journal of Physical Chemistry. A
|August 28, 2012
PubMed
Summary

Lithium dialkylcuprates can form complex mixtures in solution with various lithium compounds. Computational modeling revealed the structures and stability of these potential mixed aggregates.

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Area of Science:

  • Organometallic Chemistry
  • Computational Chemistry

Background:

  • Lithium dialkylcuprates are versatile reagents in organic synthesis.
  • Their reactivity can be influenced by the presence of various lithium-containing species in solution.
  • Understanding these interactions is crucial for controlling reaction outcomes.

Purpose of the Study:

  • To investigate the potential formation of mixed aggregates involving lithium dialkylcuprates.
  • To elucidate the structures and thermodynamic stability of these aggregates.
  • To compare computational findings with existing experimental data.

Main Methods:

  • Utilized the M06 Density Functional Theory (DFT) method for electronic structure calculations.
  • Modeled various potential mixed aggregates formed with alkyllithium, lithium halides, and other species.
  • Calculated formation energies to assess aggregate stability.

Main Results:

  • Identified several plausible mixed aggregate structures involving lithium dialkylcuprates and other lithium species.
  • Quantified the energies associated with the formation of these aggregates.
  • DFT calculations provided insights into the complex solution-phase behavior of cuprates.

Conclusions:

  • Mixed aggregate formation is a significant factor in lithium dialkylcuprate chemistry.
  • Computational methods like DFT are valuable tools for predicting and understanding these complex interactions.
  • The findings aid in the rational design and optimization of reactions utilizing these reagents.