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Related Concept Videos

Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

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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VSEPR Theory for Determination of Electron Pair Geometries
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In the late 1800s, the revelation that light extended beyond visible wavelengths led to the discovery of X-rays by Wilhelm Roentgen. Recognized as high-energy electromagnetic radiation with short wavelengths, X-rays prompted exploration into their interaction with crystals. Max von Laue proposed in 1912 that the periodic arrangement of atoms, ions, or molecules in crystals would cause them to diffract X-rays, a hypothesis confirmed through experiments with copper sulfate and zinc sulfide...
X-ray Crystallography02:18

X-ray Crystallography

The size of the unit cell and the arrangement of atoms in a crystal may be determined from measurements of the diffraction of X-rays by the crystal, termed X-ray crystallography.
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Physical models representing molecular architectures of chemical compounds play essential roles in understanding chemistry. The use of molecular models makes it easier to visualize the structures and shapes of atoms and molecules.
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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Related Experiment Video

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Achieving Efficient Fragment Screening at XChem Facility at Diamond Light Source
08:35

Achieving Efficient Fragment Screening at XChem Facility at Diamond Light Source

Published on: May 29, 2021

Practical quantum mechanics-based fragment methods for predicting molecular crystal properties.

Shuhao Wen1, Kaushik Nanda, Yuanhang Huang

  • 1Department of Chemistry, University of California, Riverside, CA 92521, USA.

Physical Chemistry Chemical Physics : PCCP
|February 11, 2012
PubMed
Summary
This summary is machine-generated.

Fragment-based electronic structure methods offer a powerful alternative for modeling molecular crystals. These advanced techniques accurately predict crystal lattice energies and parameters, crucial for condensed-phase simulations.

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Last Updated: May 25, 2026

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Area of Science:

  • Computational chemistry
  • Materials science
  • Solid-state physics

Background:

  • Fragment-based electronic structure methods are emerging as viable alternatives to traditional force-field and density functional theory approaches for condensed-phase systems.
  • Modeling molecular crystals presents unique challenges due to complex intermolecular interactions and the need for high accuracy.

Purpose of the Study:

  • To highlight key challenges in modeling molecular crystals.
  • To discuss recent advancements in fragment-based methods for molecular crystal simulations.
  • To analyze the physical requirements for effective molecular crystal modeling using a hybrid many-body interaction (HMBI) model.

Main Methods:

  • Survey of recent developments in fragment-based electronic structure methods.
  • Application of a fragment-based QM/MM method, the hybrid many-body interaction (HMBI) model.
  • Analysis of physical requirements for practical molecular crystal model chemistry.

Main Results:

  • Demonstrated prediction of molecular crystal lattice energies within a few kJ mol(-1).
  • Achieved prediction of lattice parameters within a few percent for small-molecule crystals.
  • Showcased the systematic improvability of fragment methods for condensed-phase predictions.

Conclusions:

  • Fragment-based methods provide a robust and systematically improvable approach for modeling molecular crystals.
  • Accurate prediction of lattice energies and parameters is achievable with advanced fragment-based techniques.
  • These methods are critical for understanding subtle energy differences in molecular crystals.