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Coordination Number and Geometry02:57

Coordination Number and Geometry

For transition metal complexes, the coordination number determines the geometry around the central metal ion. Table 1 compares coordination numbers to molecular geometry. The most common structures of the complexes in coordination compounds are octahedral, tetrahedral, and square planar.
Valence Bond Theory02:42

Valence Bond Theory

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...
Ionic Crystal Structures02:42

Ionic Crystal Structures

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...
Coordination Compounds and Nomenclature02:54

Coordination Compounds and Nomenclature

In most main group element compounds, the valence electrons of the isolated atoms combine to form chemical bonds that satisfy the octet rule. For instance, the four valence electrons of carbon overlap with electrons from four hydrogen atoms to form CH4. The one valence electron leaves sodium and adds to the seven valence electrons of chlorine to form the ionic formula unit NaCl (Figure 1a). Transition metals do not normally bond in this fashion. They primarily form coordinate covalent bonds, a...
Lattice Centering and Coordination Number02:33

Lattice Centering and Coordination Number

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...
Crystal Field Theory - Tetrahedral and Square Planar Complexes02:46

Crystal Field Theory - Tetrahedral and Square Planar Complexes

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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Updated: Jun 29, 2026

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

八核の立方体の調整ケージ.

Ian S Tidmarsh1, Thomas B Faust, Harry Adams

  • 1Department of Chemistry, University of Sheffield, UK.

Journal of the American Chemical Society
|October 16, 2008
PubMed
まとめ
この要約は機械生成です。

2つの新しいビスビデント酸ブリッジングリガンド,L (naph) とL (anth) は,移行金属と立方体{M 8L 12}の超分子ケージを形成する. L (naph) ケージは,L (anth) ケージとは異なり,pi-stackingの相互作用により,極性溶媒における安定性を高めています.

さらに関連する動画

Preparation of a Corannulene-functionalized Hexahelicene by Copper(I)-catalyzed Alkyne-azide Cycloaddition of Nonplanar Polyaromatic Units
09:35

Preparation of a Corannulene-functionalized Hexahelicene by Copper(I)-catalyzed Alkyne-azide Cycloaddition of Nonplanar Polyaromatic Units

Published on: September 18, 2016

Line Shape Analysis of Dynamic NMR Spectra for Characterizing Coordination Sphere Rearrangements at a Chiral Rhenium Polyhydride Complex
10:52

Line Shape Analysis of Dynamic NMR Spectra for Characterizing Coordination Sphere Rearrangements at a Chiral Rhenium Polyhydride Complex

Published on: July 27, 2022

関連する実験動画

Last Updated: Jun 29, 2026

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

Preparation of a Corannulene-functionalized Hexahelicene by Copper(I)-catalyzed Alkyne-azide Cycloaddition of Nonplanar Polyaromatic Units
09:35

Preparation of a Corannulene-functionalized Hexahelicene by Copper(I)-catalyzed Alkyne-azide Cycloaddition of Nonplanar Polyaromatic Units

Published on: September 18, 2016

Line Shape Analysis of Dynamic NMR Spectra for Characterizing Coordination Sphere Rearrangements at a Chiral Rhenium Polyhydride Complex
10:52

Line Shape Analysis of Dynamic NMR Spectra for Characterizing Coordination Sphere Rearrangements at a Chiral Rhenium Polyhydride Complex

Published on: July 27, 2022

科学分野:

  • 超分子化学 超分子化学
  • 協調化化学について
  • 材料科学 材料科学とは

背景:

  • 複雑な超分子アーキテクチャを構築するための新しいリガンドの開発.
  • 自己組み立てのケージにおける金属-リガンド相互作用の調査.
  • ケージの特性と安定性に対するリガンド構造の影響を理解する.

研究 の 目的:

  • 新しいビスビデント酸ブリッジングリガンド,L (naph) とL (anth) を合成し,特徴づけること.
  • これらのリガンドと様々な移行金属を使用して,{M 8L 12} 超分子ケージの自己組み立てを調査します.
  • L (naph) リガンドとL (anth) リガンドで形成されたケージの構造的差異と安定性を研究する.

主な方法:

  • リガンドの合成と特徴づけ.
  • 超分子ケージの構造的決定のためのX線結晶学.
  • の性質と溶液の安定性を研究するための光譜技術 (NMR,光)
  • 金属-リガンドの協調と分子間相互作用の分析.

主要な成果:

  • L (NAPH) と L (ANTH) リガンドの合成が成功しました.
  • 移行金属 (Cu, Zn, Co, Ni, Cd) で立方体 {M 8L 12} のケージを形成する.
  • 構造的な解明により,異なる建築が明らかになった:螺旋面を持つL (anth) 檻,S6対称性と周辺のpiスタッキングを持つL (naph) 檻.
  • L (naph) ケージは,アロマティック・スタッキングにより,L (anth) ケージと比較して,極性溶媒における優れた安定性を示した.
  • Cd-L ((naph) の光研究では,pi-stacked リガンドからの電荷移転放射が示された.

結論:

  • 特定のアロマティック・スペーサーを備えたビスビデント酸ブリッジングリガンドの設計は,超分子ケージの自己組み立てと安定性に影響を与えます.
  • L ((naph) 檻の周辺の芳香性pi-stackingは,溶液中の構造的整合性を高めています.
  • これらの発見は,頑丈で機能的な超分子材料の合理的な設計に関する洞察を提供します.