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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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Valence Bond Theory02:42

Valence Bond Theory

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Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
8.3K
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...
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Metallic Solids02:37

Metallic Solids

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Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and...
18.0K
Colors and Magnetism03:02

Colors and Magnetism

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Color in Coordination Complexes
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human...
11.3K
Structures of Solids02:22

Structures of Solids

13.5K
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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相关实验视频

Updated: May 7, 2025

Construction and Systematical Symmetric Studies of a Series of Supramolecular Clusters with Binary or Ternary Ammonium Triphenylacetates
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非传统的六角形开放的普鲁士蓝色模拟结构.

Jinwen Yin1,2, Jing Wang3,4, Mingzi Sun5

  • 1Department of Chemistry, City University of Hong Kong, Kowloon, Hong Kong, China.

Nature communications
|January 3, 2025
PubMed
概括
此摘要是机器生成的。

研究人员开发了六边形的普鲁士蓝色类似物 (PBA),具有更大的毛孔和更高的表面积. 与传统的立方PBA相比,这些新型的六角开放结构显示了二氧化碳和碳化合物的增强气体吸附.

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Using Microwave and Macroscopic Samples of Dielectric Solids to Study the Photonic Properties of Disordered Photonic Bandgap Materials
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科学领域:

  • 材料科学 材料科学 材料科学
  • 纳米技术纳米技术
  • 化学 化学 化学

背景情况:

  • 普鲁士蓝色类似物 (PBA) 是具有明确结构的微孔材料.
  • 传统的PBA具有具有有限孔径和表面积的立方结构,限制了应用.
  • 应用范围包括气体吸附,分离,能量储存和生物医学治疗.

研究的目的:

  • 为了合成非常规的六角开放的普鲁士蓝色模拟结构.
  • 为了比较六角PBA与传统立方PBA的性能和性能.
  • 研究新结构中增强气体吸附背后的机制.

主要方法:

  • 容易和一般合成的六角铜六甲 PBA 镜 (H-CuCo).
  • 对六角形和立方形结构的孔径大小和特定表面积的描述.
  • 测量二氧化碳和小型碳化合物的气体吸收能力.
  • 机制研究侧重于活性金属部位.

主要成果:

  • 六角 CuCo PBA 镜 (H-CuCo) 与立方 CuCo PBA 立方 (C-CuCo) (5.48 Å 和 443 m2 g-1) 相比,具有显著更大的孔径 (12.32 Å) 和表面积 (1273 m2 g-1).
  • 与C-CuCo相比,H-CuCo显示出更高的二氧化碳和碳化合物的气体吸收能力.
  • 在H-CuCo内的平面四边形配置中的不和Cu位点被确定为增强吸附的关键.

结论:

  • 为六角开放的普鲁士蓝色类似物建立了一个新的,简单的合成路线.
  • 六角形结构提供了优越的气体吸附能力,这是由于孔径和表面积的增加.
  • 这些发现为气体储存和分离中的先进材料开辟了新的途径.