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X-ray Crystallography02:18

X-ray Crystallography

23.7K
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...
23.7K
Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

25.9K
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...
25.9K
Predicting Molecular Geometry02:27

Predicting Molecular Geometry

34.0K
VSEPR Theory for Determination of Electron Pair Geometries
34.0K
Crystal Field Theory - Tetrahedral and Square Planar Complexes02:46

Crystal Field Theory - Tetrahedral and Square Planar Complexes

41.1K
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,...
41.1K
Crystal Growth: Principles of Crystallization01:25

Crystal Growth: Principles of Crystallization

1.5K
Crystallization is a phase transformation process in which crystals are precipitated from a supersaturated solution or formed from other sources. During crystallization, atoms or molecules arrange themselves into a well-defined, rigid crystal lattice to minimize energy.
Initiating crystallization involves manipulating the concentration of the solute and the temperature of the solution. Since crystal growth occurs when the ratio of concentration and solubility of the solute in the solvent...
1.5K

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Updated: May 23, 2025

Fully Autonomous Characterization and Data Collection from Crystals of Biological Macromolecules
07:11

Fully Autonomous Characterization and Data Collection from Crystals of Biological Macromolecules

Published on: March 22, 2019

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LoreX:低エネルギー領域探査機が効率的な結晶構造の予測を向上させる

Chuan-Nan Li1,2,3, Han-Pu Liang3,4, Siyuan Xu5

  • 1Department of Physics, University of Science and Technology of China, Hefei 230026, China.

Journal of the American Chemical Society
|March 11, 2025
PubMed
まとめ

LoreXという新しい方法は グラフのディープラーニングを使って 低エネルギー結晶構造を 素早く発見します これは潜在エネルギー表面を効率的に探求することで 材料の設計を加速します

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Preparation and Delivery of Protein Microcrystals in Lipidic Cubic Phase for Serial Femtosecond Crystallography
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Preparation and Delivery of Protein Microcrystals in Lipidic Cubic Phase for Serial Femtosecond Crystallography

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Combining X-Ray Crystallography with Small Angle X-Ray Scattering to Model Unstructured Regions of Nsa1 from S. Cerevisiae
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Combining X-Ray Crystallography with Small Angle X-Ray Scattering to Model Unstructured Regions of Nsa1 from S. Cerevisiae

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Fully Autonomous Characterization and Data Collection from Crystals of Biological Macromolecules
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科学分野:

  • 材料科学
  • コンピュータ化学
  • 人工知能

背景:

  • 機械学習は,材料設計のための結晶構造予測 (CSP) を大幅に進歩させています.
  • CSPにおける大きな課題は,潜在エネルギー面 (PES) の低エネルギー領域の特定が遅いことです.

研究 の 目的:

  • 低エネルギー地域をPESで迅速に探査するための新しい方法LoreXを開発する.
  • 結晶構造の予測の全体的な効率を高めるために.

主な方法:

  • グラフ・ディープ・ラーニングベースの潜在エネルギー表面 (PES) スライシングを使用します.
  • 効率的な探査のために PESを分割し征服するプロトタイプに構造を分類する.

主要な成果:

  • LoreXは,最小のサンプル (例えば100) を使用して,PES上の低エネルギー領域を正確かつ効率的に位置づけます.
  • 27種類の化合物で有効性を証明した
  • CuIn5Se8のような複雑な構造を解明するために成功しました.

結論:

  • LoreXは PESの急速な探査のための新しいパラダイムを確立します.
  • CSPと材料の発見を加速するために,非常に効率的で広く適用可能なアプローチを提供します.