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Related Concept Videos

Complexation Equilibria: Factors Influencing Stability of Complexes01:09

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In complexation reactions, metal cations are the electron pair acceptors, and the ligands are the electron pair donors. The stability of the metal complexes depends primarily on the complexing ability of the central metal ion and the nature of the ligands. Generally, the complexing ability of the metal ion depends on the size and charge of the ion. As the metal ion size increases, the stability of the metal complexes decreases, provided that the valency of the metal ion and the ligands remain...
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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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Ladder diagrams are useful tools for understanding redox equilibrium reactions, especially the effects of concentration changes on the electrochemical potential of the reaction. The vertical axis in the redox ladder diagrams represents the electrochemical potential, E. The area of predominance is demarcated using the Nernst equation.
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Transition metals are defined as those elements that have partially filled d orbitals. As shown in Figure 1, the d-block elements in groups 3–12 are transition elements. The f-block elements, also called inner transition metals (the lanthanides and actinides), also meet this criterion because the d orbital is partially occupied before the f orbitals.
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Metal ions can be separated from one another by complexation with organic ligands–the chelating agent– to form uncharged chelates. Here, the chelating agent must contain hydrophobic groups and behave as a weak acid, losing a proton to bind with the metal. Since most organic ligands used in this process are insoluble or undergo oxidation in the aqueous phase, the chelating agent is initially added to the organic phase and extracted into the aqueous phase. The metal-ligand complex is...
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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...
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Predicted stable electrides in Mg-Al systems under high pressure.

Cong Li1, Weiwei Li1, Xiaoliang Zhang1

  • 1Center for High Pressure Science and Technology Advanced Research, Shanghai 201203, P. R. China. cong.li@hpstar.ac.cn.

Physical Chemistry Chemical Physics : PCCP
|May 11, 2022
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Summary

Researchers discovered new magnesium-aluminum compounds stable under high pressure. These novel materials are identified as electrides due to unique electron confinement, offering insights into high-pressure materials chemistry.

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Area of Science:

  • Materials Science
  • Solid State Chemistry
  • Computational Materials Science

Background:

  • Magnesium (Mg) and aluminum (Al), adjacent light metals, exhibit limited stable compound formation under ambient conditions.
  • Understanding Mg-Al phase diagrams and structures under extreme conditions is crucial for materials science.

Purpose of the Study:

  • To systematically explore the Mg-Al compositional space at high pressures (up to 100 GPa).
  • To identify novel thermodynamically stable Mg-Al stoichiometries and characterize their electronic properties.

Main Methods:

  • Utilized evolutionary ab initio structural prediction methods.
  • Conducted comprehensive computational searches across the entire Mg-Al compositional landscape.
  • Analyzed electronic structures to determine compound stability and properties.

Main Results:

  • Predicted three new thermodynamically stable Mg-Al compounds: Mg3Al, MgAl, and MgAl3, under specific high-pressure regimes.
  • Identified these compounds as novel electrides, characterized by excess electrons confined in interstitial voids.
  • Attributed the electride nature to the high-pressure induced overlap of 3p orbitals in neighboring Al atoms.

Conclusions:

  • The study reveals previously unknown stable Mg-Al compounds and their electride nature under high pressure.
  • Provides a theoretical foundation for experimental synthesis and characterization of these novel Mg-Al materials.
  • Advances the understanding of materials chemistry and electron behavior in high-pressure environments.