Jove
Visualize
联系我们
JoVE
x logofacebook logolinkedin logoyoutube logo
关于 JoVE
概览领导团队博客JoVE 帮助中心
作者
出版流程编辑委员会范围与政策同行评审常见问题投稿
图书馆员
用户评价订阅访问资源图书馆顾问委员会常见问题
研究
JoVE JournalMethods CollectionsJoVE Encyclopedia of Experiments存档
教育
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab Manual教师资源中心教师网站
使用条款与条件
隐私政策
政策

相关概念视频

Crystal Field Theory - Tetrahedral and Square Planar Complexes02:46

Crystal Field Theory - Tetrahedral and Square Planar Complexes

42.8K
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,...
42.8K
Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

26.6K
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...
26.6K
Lattice Centering and Coordination Number02:33

Lattice Centering and Coordination Number

9.6K
The structure of a crystalline solid, whether a metal or not, is best described by considering its simplest repeating unit, which is referred to as its unit cell. The unit cell consists of lattice points that represent the locations of atoms or ions. The entire structure then consists of this unit cell repeating in three dimensions. The three different types of unit cells present in the cubic lattice are illustrated in Figure 1.
Types of Unit Cells
Imagine taking a large number of identical...
9.6K
Structures of Solids02:22

Structures of Solids

14.2K
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...
14.2K
Ionic Crystal Structures02:42

Ionic Crystal Structures

14.4K
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...
14.4K
Network Covalent Solids02:18

Network Covalent Solids

13.5K
Network covalent solids contain a three-dimensional network of covalently bonded atoms as found in the crystal structures of nonmetals like diamond, graphite, silicon, and some covalent compounds, such as silicon dioxide (sand) and silicon carbide (carborundum, the abrasive on sandpaper). Many minerals have networks of covalent bonds.
To break or to melt a covalent network solid, covalent bonds must be broken. Because covalent bonds are relatively strong, covalent network solids are typically...
13.5K

您也可能阅读

相关文章

通过共同作者、期刊和引用图与本文相关的文章。

排序
Same author

Correction to: Survival benefit of ⁶⁸Ga-FAPI PET/CT staging for prognostic assessment in gastric and colorectal cancer compared with CE-CT and ¹⁸F-FDG PET/CT: a single-center retrospective study.

European journal of nuclear medicine and molecular imaging·2026
Same author

Aligning Chemical Kinetics with Crystallization Enables Millimeter-Scale Single Crystals of Conductive MOFs.

Journal of the American Chemical Society·2026
Same author

Survival benefit of ⁶⁸Ga-FAPI PET/CT staging for prognostic assessment in gastric and colorectal cancer compared with CE-CT and ¹⁸F-FDG PET/CT: a single-center retrospective study.

European journal of nuclear medicine and molecular imaging·2026
Same author

A Naphthalene-Based Three-Dimensional Covalent Organic Framework with acs Topology for Highly Selective Sulfur Hexafluoride Capture.

Polymer science & technology (Washington, D.C.)·2026
Same author

Imine Linkage Isomerism in Layer-Entangled Three-Dimensional Covalent Organic Frameworks Modulates Fluorescent Sensing.

Angewandte Chemie (International ed. in English)·2026
Same author

Olfactory Valence-Processing Deficits and Aberrant Brain Network Connectivity Underlie Social Dysfunction in Shank3<sup>-/-</sup> ASD Model Mice.

Neuroscience bulletin·2026

相关实验视频

Updated: Jul 15, 2025

Microfluidic-based Synthesis of Covalent Organic Frameworks COFs: A Tool for Continuous Production of COF Fibers and Direct Printing on a Surface
08:42

Microfluidic-based Synthesis of Covalent Organic Frameworks COFs: A Tool for Continuous Production of COF Fibers and Direct Printing on a Surface

Published on: July 10, 2017

13.4K

由6个连接的三角镜节点构建的单晶三维共价有机框架

Ying Yin1, Ya Zhang1,2, Xu Zhou1

  • 1College of Chemistry and Molecular Sciences, Wuhan University, Wuhan 430072, China.

Journal of the American Chemical Society
|October 4, 2023
PubMed
概括
此摘要是机器生成的。

研究人员开发了一种新的三角镜节点,以创建一个新的3D共价有机框架 (3D COF). 这种材料表现出异常的硫六化物 (SF6) 吸附和选择性,为气体捕获提供了多孔材料.

更多相关视频

Synthesis of Single-Crystalline Core-Shell Metal-Organic Frameworks
05:26

Synthesis of Single-Crystalline Core-Shell Metal-Organic Frameworks

Published on: February 10, 2023

2.6K
Construction and Systematical Symmetric Studies of a Series of Supramolecular Clusters with Binary or Ternary Ammonium Triphenylacetates
06:35

Construction and Systematical Symmetric Studies of a Series of Supramolecular Clusters with Binary or Ternary Ammonium Triphenylacetates

Published on: February 15, 2016

8.2K

相关实验视频

Last Updated: Jul 15, 2025

Microfluidic-based Synthesis of Covalent Organic Frameworks COFs: A Tool for Continuous Production of COF Fibers and Direct Printing on a Surface
08:42

Microfluidic-based Synthesis of Covalent Organic Frameworks COFs: A Tool for Continuous Production of COF Fibers and Direct Printing on a Surface

Published on: July 10, 2017

13.4K
Synthesis of Single-Crystalline Core-Shell Metal-Organic Frameworks
05:26

Synthesis of Single-Crystalline Core-Shell Metal-Organic Frameworks

Published on: February 10, 2023

2.6K
Construction and Systematical Symmetric Studies of a Series of Supramolecular Clusters with Binary or Ternary Ammonium Triphenylacetates
06:35

Construction and Systematical Symmetric Studies of a Series of Supramolecular Clusters with Binary or Ternary Ammonium Triphenylacetates

Published on: February 15, 2016

8.2K

科学领域:

  • 材料科学
  • 化学学
  • 纳米技术

背景情况:

  • 三维共价有机框架 (3D COF) 的结构多样性有限,阻碍了它们的应用.
  • 开发高度连接的多面体节点对于扩展3D COF库至关重要.

研究的目的:

  • 设计和合成一个新的6连接的三角镜节点.
  • 使用这个节点构建一个新的3D COF并探索它的属性.
  • 研究这种3DCOF在气体吸附应用中的潜力.

主要方法:

  • 由三二制成的6连接的三角镜节点的合理设计.
  • 通过imine凝结构建一个新的3D COF (3D-TMTAPB-COF).
  • 单晶X射线衍射以确定晶体结构和拓 (acs,6倍相互透).
  • 在298K和1bar时对SF6和N2进行气体吸附测量.

主要成果:

  • 一个新的6连接的三角镜节点已成功合成.
  • 构建了一个具有罕见的6倍互穿的ACS拓的新型3D COF (3D-TMTAPB-COF).
  • 通过无调节器的溶热方法获得3DCOF的大单晶体 (∼15μm).
  • 3D-TMTAPB-COF显示了高的SF6吸附能力 (60.9cm3g-1) 和SF6/N2的选择性 (335).

结论:

  • 该研究证实使用强共价键通过无调节器的溶热方法生长大尺寸单晶3DCOF的可行性.
  • 一个新的三角镜节点被报道,为构建3DCOF提供了新的可能性.
  • 合成的3D COF在SF6捕获方面显示出有前途的性能,超过了许多现有的晶体多孔材料.