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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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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.
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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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Growth and Electrostatic/chemical Properties of Metal/LaAlO3/SrTiO3 Heterostructures
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Correlated Anion Disorder in Heteroanionic Cubic TiOF2.

Christophe Legein1, Benjamin J Morgan2,3, Alexander G Squires3,4

  • 1Institut des Molécules et des Matériaux du Mans (IMMM), UMR 6283 CNRS, Le Mans Université, Avenue Olivier Messiaen, 72085 Le Mans Cedex 9, France.

Journal of the American Chemical Society
|July 26, 2024
PubMed
Summary
This summary is machine-generated.

Anion disorder in TiOF2 was resolved using advanced computational and experimental methods. This revealed short-range ordering that enhances lithium intercalation, crucial for battery material development.

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Area of Science:

  • Materials Science
  • Solid-State Chemistry
  • Computational Materials Science

Background:

  • Resolving anion configurations in heteroanionic materials is key to controlling their properties.
  • Anion-disordered oxyfluorides present challenges for conventional structure determination methods like Bragg diffraction.

Purpose of the Study:

  • To investigate the anionic structure of anion-disordered cubic titanium oxyfluoride (TiOF2).
  • To demonstrate the effectiveness of combined experimental and computational techniques for resolving complex anionic structures.

Main Methods:

  • Utilized X-ray pair distribution function (PDF) analysis and 19F MAS NMR spectroscopy.
  • Employed density functional theory (DFT) calculations, cluster expansion modeling, and genetic-algorithm structure prediction.
  • Developed new transformation functions for accurate 19F NMR spectral simulations.

Main Results:

  • Predicted and validated short-range anion ordering in TiOF2, with a predominant cis-[O2F4] titanium coordination.
  • Achieved good agreement between simulated and experimental X-ray PDF and 19F MAS NMR data.
  • Computational data supports the proposed structural model and highlights the efficacy of the employed methodologies.

Conclusions:

  • The study successfully resolved the anionic structure of anion-disordered TiOF2, showcasing the power of complementary techniques.
  • Increasing anion disorder was predicted to significantly enhance lithium intercalation, with potential implications for energy storage.
  • Short-range order variations critically influence the intercalation properties of anion-disordered materials.