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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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Electron Configurations02:46

Electron Configurations

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Electron configurations and orbital diagrams can be determined by applying the Aufbau principle (each added electron occupies the subshell of lowest energy available), Pauli exclusion principle (no two electrons can have the same set of four quantum numbers), and Hund’s rule of maximum multiplicity (whenever possible, electrons retain unpaired spins in degenerate orbitals).
The relative energies of the subshells determine the order in which atomic orbitals are filled (1s, 2s, 2p, 3s, 3p,...
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Predicting Molecular Geometry

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VSEPR Theory for Determination of Electron Pair Geometries
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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 - 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...
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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,...
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Updated: Oct 12, 2025

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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Equatorial Electronic Structure in the Uranyl Ion: Cs2UO2Cl4 and Cs2UO2Br4.

Dumitru-Claudiu Sergentu1, Frédéric Gendron1, Eric D Walter2

  • 1Department of Chemistry, University at Buffalo, State University of New York, Buffalo, New York 14260-3000, United States.

Inorganic Chemistry
|November 24, 2021
PubMed
Summary

Nuclear magnetic resonance and relativistic computations reveal electric field gradients in uranyl complexes. Ligand interactions significantly influence these gradients, impacting electronic structure insights.

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Area of Science:

  • Solid-state chemistry
  • Computational chemistry
  • Nuclear physics

Background:

  • Uranyl complexes (UO2^2+) are crucial in nuclear chemistry and materials science.
  • Understanding their electronic structure is key to predicting chemical behavior.
  • Probing beyond the U-O bond offers new insights into uranyl complex properties.

Purpose of the Study:

  • To measure and compute electric field gradient (EFG) tensors in uranyl complexes.
  • To investigate the influence of ligand environment on EFG.
  • To expand methods for electronic structure analysis in uranyl systems.

Main Methods:

  • Nuclear magnetic resonance (NMR) and nuclear quadrupole resonance (NQR) experiments.
  • Relativistic Kohn-Sham computational methods.
  • Environment embedding models for Cs2UO2Cl4 and Cs2UO2Br4.

Main Results:

  • EFG tensor components were determined at halogen sites.
  • Ligand donation (σ and π) and environmental models affect EFG principal axes.
  • Cs2UO2Br4 shows distinct EFG component magnitudes due to Cs-Br interactions.
  • No uranium isotope shift observed in Chlorine-35 NQR spectra.

Conclusions:

  • EFG measurements and computations provide detailed electronic structure information.
  • Environmental effects and ligand donation are critical factors in EFG anisotropy.
  • NMR/NQR and computational methods offer complementary insights into uranyl complexes.