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Related Concept Videos

Ionic Crystal Structures02:42

Ionic Crystal Structures

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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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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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Crystal Field Theory - Tetrahedral and Square Planar Complexes02:46

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Tetrahedral Complexes
Crystal field theory (CFT) is applicable to molecules in geometries other than octahedral. In octahedral complexes, the lobes of the dx2−y2 and dz2 orbitals point directly at the ligands. For tetrahedral complexes, the d orbitals remain in place, but with only four ligands located between the axes. None of the orbitals points directly at the tetrahedral ligands. However, the dx2−y2 and dz2 orbitals (along the Cartesian axes) overlap with the ligands less than the dxy,...
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Valence Bond Theory02:42

Valence Bond Theory

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Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
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Crystal Field Theory
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...
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Ionic Bonding and Electron Transfer02:48

Ionic Bonding and Electron Transfer

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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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Structure and Dynamics in Mg2+-Stabilized γ-Na3PO4.

Emily A Cheung1, Han Nguyen2, Hanmei Tang2

  • 1School of Chemistry, University of New South Wales Australia, Sydney, NSW 2052, Australia.

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|October 6, 2021
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This study reveals coupled anion-cation dynamics in Mg2+-stabilized sodium phosphate, crucial for understanding solid-state ionic conductor mechanisms and designing better energy materials.

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Area of Science:

  • Solid-state chemistry
  • Materials science
  • Ion transport phenomena

Background:

  • Advances in solid-state ionic conductors necessitate understanding mechanisms of enhanced ionic conductivity.
  • Atomic-level insights into material structure and ionic diffusion are critical for optimizing energy materials.

Purpose of the Study:

  • To investigate the structure and dynamics of Mg2+-stabilized rotor phase material γ-Na3PO4.
  • To elucidate the interplay between material structure, phosphate anion dynamics, and sodium ion diffusion.

Main Methods:

  • Neutron scattering techniques, including quasi-elastic neutron scattering (QENS).
  • Analysis of long-range Na+ self-diffusion.
  • Modeling of diffusion using a jump diffusion matrix incorporating phosphate anion rotations.

Main Results:

  • The Mg2+-stabilized rotor phase is thermally stable from 4 to 650 K.
  • Evidence of orientational disorder in phosphate anions within the average structure.
  • A diffusion model indicating coupled anion-cation dynamics was developed.

Conclusions:

  • Understanding the whole system, including coupled anion-cation dynamics, is vital for a complete atomic-level picture.
  • This approach is critical for the rational design and optimization of solid-state ionic conductors for energy applications.