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Related Concept Videos

X-ray Crystallography02:18

X-ray Crystallography

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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.
Diffraction
Diffraction is the change in the direction of travel experienced by an electromagnetic wave when it encounters a physical barrier whose dimensions are comparable to those of the wavelength of the light. X-rays are electromagnetic radiation with wavelengths about as long as the distance between neighboring...
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X-ray diffraction or XRD is an analytical tool that utilizes X-rays to study ordered structures such as crystalline organic and inorganic samples, polycrystalline materials, proteins, carbohydrates, and drugs.
According to Bragg's law, when X-rays strike the sample positioned on a stage, the rays are  scattered by the electron clouds around the sample atoms. The  X-ray diffraction or scattering is caused by constructive interference of the X-ray waves that reflect off the internal...
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Crystal Field Theory - Octahedral Complexes02:58

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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

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Tetrahedral Complexes
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On-Chip Crystallization and Large-Scale Serial Diffraction at Room Temperature
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Quantum crystallography.

Simon Grabowsky1, Alessandro Genoni2,3, Hans-Beat Bürgi4,5

  • 1Universität Bremen , Fachbereich 2 - Biologie/Chemie , Institut für Anorganische Chemie und Kristallographie , Leobener Str. NW2 , 28359 Bremen , Germany .

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|September 8, 2017
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Summary
This summary is machine-generated.

Quantum crystallography enhances wavefunctions and charge density models by integrating quantum chemistry with diffraction experiments. This combined approach refines structural and electronic information from experimental data.

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Area of Science:

  • Solid-state chemistry
  • Quantum chemistry
  • Crystallography

Background:

  • Approximate wavefunctions and charge density models are crucial in materials science.
  • Diffraction and scattering experiments provide valuable structural and electronic information.
  • Integrating computational and experimental methods offers synergistic improvements.

Purpose of the Study:

  • To review the development of quantum crystallography.
  • To demonstrate the integration of quantum chemistry and diffraction/scattering experiments.
  • To illustrate the potential and limitations of quantum crystallography.

Main Methods:

  • Constraining wavefunctions using experimental diffraction/scattering data.
  • Supplementing diffraction experiments with quantum chemically calculated electron densities (form factors).
  • Combining quantum chemistry calculations with experimental crystallographic data.

Main Results:

  • Improved accuracy in wavefunctions and charge density models.
  • Synergistic enhancement of experimental data through theoretical calculations.
  • Demonstration of quantum crystallography's capabilities and constraints.

Conclusions:

  • Quantum crystallography serves as an integrated tool for refining structural and electronic properties.
  • The field shows significant potential for advancing materials characterization.
  • Understanding the limitations is key to further development in quantum crystallography.