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相关概念视频

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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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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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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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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Structures of Solids02:22

Structures of Solids

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Solids in which the atoms, ions, or molecules are arranged in a definite repeating pattern are known as crystalline solids. Metals and ionic compounds typically form ordered, crystalline solids. A crystalline solid has a precise melting temperature because each atom or molecule of the same type is held in place with the same forces or energy. Amorphous solids or non-crystalline solids (or, sometimes, glasses) which lack an ordered internal structure and are randomly arranged. Substances that...
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VSEPR Theory and the Basic Shapes02:52

VSEPR Theory and the Basic Shapes

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Overview of VSEPR Theory
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Neutron Crystallography Data Collection and Processing for Modelling Hydrogen Atoms in Protein Structures
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希尔什菲尔德原子精炼和从电子衍射数据的六角冰结构的动态精炼.

Michał Leszek Chodkiewicz1, Barbara Olech1, Kunal Kumar Jha2

  • 1Biological and Chemical Research Centre, Department of Chemistry, University of Warsaw, Żwirki i Wigury 101, Warszawa, Warszawa 02-089, Poland.

IUCrJ
|July 30, 2024
PubMed
概括
此摘要是机器生成的。

希尔什菲尔德原子精细化 (HAR) 首次应用于电子衍射数据,由于动态散射效应,对六角冰 (Ih) 结构的影响最小. 提高准确性需要对这些动态效应进行建模.

关键词:
希尔什菲尔德原子精细化 原子精细化动态提炼 精炼 动态提炼动态分散效应的动态分散效应电子衍射的电子衍射方式六角形的冰是六角形的动力学 HAR HAR 是一个动力学 HAR.

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科学领域:

  • 晶体学 晶体学是指结晶学.
  • 材料科学 材料科学 材料科学
  • 量子化学 是一个量子化学.

背景情况:

  • 在结构分析中,准确确定原子位置至关重要.
  • 球形原子模型在X射线晶体学中限制了精度;在电子衍射中,不球性效应的研究较少.
  • 希尔什菲尔德原子精炼 (HAR) 使用量子力学计算来准确描述电子密度.

研究的目的:

  • 首次将希什菲尔德原子精细化 (HAR) 应用于动力学电子衍射数据.
  • 研究HAR对六角冰 (Ih) 的结构参数的影响.
  • 为了将HAR结果与独立原子模型 (IAM) 和中子衍射数据进行比较.

主要方法:

  • 希尔什菲尔德原子精炼 (HAR) 的应用在动力学电子衍射数据上.
  • 结果与独立原子模型 (IAM) 改进结果的比较.
  • 对O-H键长度精度与参考中子衍射数据的分析.
  • 通过灭绝校正和动态改进来研究动态散射效应.

主要成果:

  • 在动力学改进中,HAR导致小的O-H债券长度缩短 (0.01 Å) 与IAM相比.
  • 动力学改进和中子数据之间的O-H键长度差异对于HAR (0.046 Å) 比IAM (0.044 Å) 更大.
  • 动态散射效应显著影响了精炼结果,动态精炼将IAM精度提高到0.021 Å.

结论:

  • 虽然HAR具有电子衍射的潜力,但它的好处目前被动态散射效应所掩盖.
  • 建模动态散射对于实现HAR在电子衍射中的全部潜力至关重要.
  • 目前的软件限制阻止了同时进行HAR和动态改进.