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Related Concept Videos

Resonance and Hybrid Structures02:16

Resonance and Hybrid Structures

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According to the theory of resonance, if two or more Lewis structures with the same arrangement of atoms can be written for a molecule, ion, or radical, the actual distribution of electrons is an average of that shown by the various Lewis structures.
Resonance Structures and Resonance Hybrids
The Lewis structure of a nitrite anion (NO2−) may actually be drawn in two different ways, distinguished by the locations of the N–O and N=O bonds.
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Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

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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...
31.0K
Resonance02:52

Resonance

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The Lewis structure of a nitrite anion (NO2−) may actually be drawn in two different ways, distinguished by the locations of the N-O and N=O bonds.
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Crystal Field Theory - Tetrahedral and Square Planar Complexes02:46

Crystal Field Theory - Tetrahedral and Square Planar Complexes

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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,...
48.7K
Valence Bond Theory02:42

Valence Bond Theory

11.4K
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...
11.4K
Lewis Structures of Molecular Compounds and Polyatomic Ions02:54

Lewis Structures of Molecular Compounds and Polyatomic Ions

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To draw Lewis structures for complicated molecules and molecular ions, it is helpful to follow a step-by-step procedure as outlined:
46.7K

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Related Experiment Video

Updated: Feb 16, 2026

U2O5 Film Preparation via UO2 Deposition by Direct Current Sputtering and Successive Oxidation and Reduction with Atomic Oxygen and Atomic Hydrogen
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U2O5 Film Preparation via UO2 Deposition by Direct Current Sputtering and Successive Oxidation and Reduction with Atomic Oxygen and Atomic Hydrogen

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Understanding Local Structure versus Long-Range Structure: The Case of UO2.

Lionel Desgranges1, Yue Ma1, Philippe Garcia1

  • 1CEA, DEN, DEC, 13108, Saint Paul lez Durance Cedex, France.

Chemistry (Weinheim an Der Bergstrasse, Germany)
|December 22, 2017
PubMed
Summary

Researchers developed a new structural model for nanostructured materials, explaining how local atomic structures within domains form the overall long-range structure observed in uranium dioxide. This advances understanding of materials with industrial applications.

Keywords:
crystal structureneutron diffractionpair-distribution functionuranium

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Area of Science:

  • Materials Science
  • Crystallography
  • Nanotechnology

Background:

  • Nanostructured materials with unique properties often exhibit local atomic structures differing from their average long-range structure.
  • Techniques like pair-distribution function analysis (PDF-analysis) reveal these local structures in materials such as pyrochlores, spinels, and doped ceria.
  • The arrangement of these nanometer-sized crystalline domains remains poorly understood.

Purpose of the Study:

  • To present the first structural model that reconciles both local and long-range atomic structures in nanostructured materials.
  • To investigate the atomic-scale structure of uranium dioxide using PDF-analysis.
  • To provide a framework for understanding domain wall structures in nanostructured materials.

Main Methods:

  • Utilized pair-distribution function analysis (PDF-analysis), a diffraction technique for atomic-scale characterization.
  • Developed a novel structural model to describe the relationship between local and long-range atomic structures.
  • Applied the model to uranium dioxide to analyze domain wall characteristics.

Main Results:

  • Presented a structural model for uranium dioxide that successfully integrates local domain structures with the observed long-range structure.
  • The model describes domain walls that maintain the uranium coordination polyhedron and adhere to symmetry requirements.
  • This work provides a method for modeling the complex arrangement of nanometer-sized crystalline domains.

Conclusions:

  • The developed structural model offers a new understanding of how local atomic arrangements within domains contribute to the macroscopic structure of nanostructured materials.
  • Accurate modeling of domain walls is crucial for advancing the design and application of nanostructured materials.
  • This research provides a foundation for further studies on materials with valuable industrial properties.