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Determination of Crystal Structures

Determination of Crystal Structures

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 Crystallography

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.
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...

$X-ray Diffraction of Biological Samples$ 01:10

X-ray Diffraction of Biological Samples

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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Neutron Crystallography Data Collection and Processing for Modelling Hydrogen Atoms in Protein Structures

Neutron Crystallography Data Collection and Processing for Modelling Hydrogen Atoms in Protein Structures

Published on: December 1, 2020

Accurate H-atom parameters from X-ray diffraction data.

Louis J Farrugia¹

¹School of Chemistry, University of Glasgow, Glasgow G12 8QQ, Scotland.

|October 9, 2014

Summary

This summary is machine-generated.

Determining hydrogen atom positions and thermal parameters solely from X-ray diffraction data presents significant challenges. This study discusses these difficulties in detail.

Keywords:

Hirshfeld atom refinement aspherical atom-partitioning density functional theory

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Area of Science:

Crystallography
Materials Science
Structural Chemistry

Background:

X-ray diffraction is a primary technique for determining atomic structures.
Hydrogen atoms, due to their low electron density, are challenging to locate accurately.
Accurate hydrogen atom parameters are crucial for understanding molecular interactions and properties.

Purpose of the Study:

To highlight the inherent difficulties in precisely defining hydrogen atom positions.
To discuss the challenges associated with determining thermal parameters for hydrogen atoms using X-ray diffraction.
To underscore the limitations of relying exclusively on X-ray diffraction data for complete hydrogen atom characterization.

Main Methods:

Discussion of established crystallographic principles.
Analysis of factors influencing hydrogen atom visibility in X-ray diffraction.
Review of common issues encountered in crystal structure refinement.

Main Results:

X-ray diffraction data alone often leads to ambiguous or inaccurate hydrogen atom positions.
Thermal parameters for hydrogen atoms derived from X-ray diffraction can be unreliable.
The low scattering power of hydrogen significantly complicates its precise localization.

Conclusions:

Relying solely on X-ray diffraction for hydrogen atom analysis is often insufficient.
Complementary techniques may be necessary for accurate hydrogen atom parameter determination.
Understanding these limitations is vital for correct interpretation of crystal structures.