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関連する概念動画

Crystal Field Theory - Tetrahedral and Square Planar Complexes02:46

Crystal Field Theory - Tetrahedral and Square Planar Complexes

41.4K
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,...
41.4K
Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

26.1K
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...
26.1K
SN2 Reaction: Stereochemistry02:23

SN2 Reaction: Stereochemistry

9.2K
In an SN2 reaction, the nucleophilic attack on the substrate and departure of the leaving group occurs simultaneously through a transition state. As the nucleophile approaches the substrate from the back-side, the configuration of the substrate carbon changes from tetrahedral to trigonal bipyramidal and then back to tetrahedral, leading to an inversion in the configuration of the product.
If the substrate is an achiral molecule at the α-carbon, the inversion of configuration is not...
9.2K
Molecular Models02:00

Molecular Models

37.8K
Physical models representing molecular architectures of chemical compounds play essential roles in understanding chemistry. The use of molecular models makes it easier to visualize the structures and shapes of atoms and molecules.
37.8K
SN2 Reaction: Transition State02:26

SN2 Reaction: Transition State

9.5K
An SN2 reaction of an alkyl halide is a single-step process in which bond formation between the nucleophile and the substrate and bond breaking between the substrate and the halide occurs simultaneously through a transition state without forming an intermediate.
When the nucleophile approaches the electrophilic carbon with its lone pairs, the halide acts as a leaving group and moves away with the electron-pair bonded to the carbon. Dotted partial bonds represent the bonds being formed or broken...
9.5K
Stereoisomerism02:52

Stereoisomerism

11.7K
Isomerism in Complexes
Isomers are different chemical species that have the same chemical formula.
Transition metal complexes often exist as geometric isomers, in which the same atoms are connected through the same types of bonds but with differences in their orientation in space. Coordination complexes with two different ligands in the cis and trans positions from a ligand of interest form isomers. For example, the octahedral [Co(NH3)4Cl2]+ ion has two isomers (Figure 1) In the cis...
11.7K

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Updated: Jun 3, 2025

Controlling the Size, Shape and Stability of Supramolecular Polymers in Water
16:24

Controlling the Size, Shape and Stability of Supramolecular Polymers in Water

Published on: August 2, 2012

18.6K

ダイナミック・スーパモレキュラー・スナブ・キューブ

Huang Wu1,2, Yu Wang3, Luka Đorđević4,5

  • 1Key Laboratory of Organic Integrated Circuit, Ministry of Education & Tianjin Key Laboratory of Molecular Optoelectronic Sciences, Department of Chemistry, Tianjin University, Tianjin, China. huangwu@hku.hk.

Nature
|January 8, 2025
PubMed
まとめ
この要約は機械生成です。

研究者たちは 生物学的構造を模倣した ダイナミックな超分子スナブキューブを作りました これらのキラル・アセンブリは 光制御可能な機械的性質と 選択的なゲストエンカプスレーションを示し 人工分子システムを進めている.

さらに関連する動画

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

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Synthesis and Characterization of Supramolecular Colloids
09:26

Synthesis and Characterization of Supramolecular Colloids

Published on: April 22, 2016

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関連する実験動画

Last Updated: Jun 3, 2025

Controlling the Size, Shape and Stability of Supramolecular Polymers in Water
16:24

Controlling the Size, Shape and Stability of Supramolecular Polymers in Water

Published on: August 2, 2012

18.6K
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

8.1K
Synthesis and Characterization of Supramolecular Colloids
09:26

Synthesis and Characterization of Supramolecular Colloids

Published on: April 22, 2016

9.7K

科学分野:

  • 超分子化学
  • 材料科学
  • バイオミメティック・ケミストリー

背景:

  • ウイルスのカプシドやフェリチンのような 生物学的封じ込め物質は 人工的なシステムにインスピレーションを与えます
  • 機械的属性やゲスト結合能力などの生物学的包装剤に似た性質を持つ人工的多面体を作成することは困難です.

研究 の 目的:

  • ダイナミックな超分子スナップキューブの ステレオ特異的な組み立てを報告する
  • キラル特性,機械特性, ゲスト封じ込め能力を調査する.

主な方法:

  • C−H結合で結ばれた12の螺旋マクロサイクルを用いたスナブキューブのステレオ特異的組立.
  • ダイアステレオ選択結晶化によって促進された階層的なキラリティの転送プロトコル.
  • エナティオメリックに純粋なスナブキューブ (直径5.1 nm,2712原子) の特徴.

主要な成果:

  • エナティオメア的に純粋な 左手と右手のスナップキューブの合成が成功しました
  • 結晶状態での可逆光色行動と可照性弾性/硬さの実証
  • 複数の小さなゲスト分子の同時収納と,分割されたフレームワーク内の2つの異なるゲストの別々の封じ込めの観察.

結論:

  • この研究は,人工的超分子組成を拡張し,バイオマクロモリキュルのキラル上の構造とダイナミックな特徴を模倣します.
  • 光制御可能な機械的性質を持つ結晶材料を製造するためのプロトコルが確立されています.
  • これらのスナップキューブは キラルの組立と機能的な役割の洞察を与え 先進的な材料への道を切り開きます