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関連する概念動画

Metal-Ligand Bonds02:51

Metal-Ligand Bonds

The hemoglobin in the blood, the chlorophyll in green plants, vitamin B-12, and the catalyst used in the manufacture of polyethylene all contain coordination compounds. Ions of the metals, especially the transition metals, are likely to form complexes.
In these complexes, transition metals form coordinate covalent bonds, a kind of Lewis acid-base interaction in which both of the electrons in the bond are contributed by a donor (Lewis base) to an electron acceptor (Lewis acid). The Lewis acid in...
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...
Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

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...
Stereoisomerism02:52

Stereoisomerism

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...
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.
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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関連する実験動画

Updated: Jun 13, 2026

Modeling Ligands into Maps Derived from Electron Cryomicroscopy
09:30

Modeling Ligands into Maps Derived from Electron Cryomicroscopy

Published on: July 19, 2024

自己組み立てのM24L48多面体とその鋭い構造は,微妙なリガンドの変異によって切り替わります.

Qing-Fu Sun1, Junji Iwasa, Daichi Ogawa

  • 1Department of Applied Chemistry, School of Engineering, The University of Tokyo and Core Research for Evolutional Science and Technology (CREST), Japan Science and Technology Corporation (JST), 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan.

Science (New York, N.Y.)
|May 1, 2010
PubMed
まとめ

研究者は,パラジウムイオンとリガンドを使用して,巨大なM24L48協調球を作りました. リガンドの幾何学における微妙な変化は,自己組み立ての結果を劇的に変化させ,複雑なナノスケールシステムにおける新興行動を示した.

さらに関連する動画

Origami Inspired Self-assembly of Patterned and Reconfigurable Particles
12:33

Origami Inspired Self-assembly of Patterned and Reconfigurable Particles

Published on: February 4, 2013

Synthesis of Information-bearing Peptoids and their Sequence-directed Dynamic Covalent Self-assembly
09:34

Synthesis of Information-bearing Peptoids and their Sequence-directed Dynamic Covalent Self-assembly

Published on: February 6, 2020

関連する実験動画

Last Updated: Jun 13, 2026

Modeling Ligands into Maps Derived from Electron Cryomicroscopy
09:30

Modeling Ligands into Maps Derived from Electron Cryomicroscopy

Published on: July 19, 2024

Origami Inspired Self-assembly of Patterned and Reconfigurable Particles
12:33

Origami Inspired Self-assembly of Patterned and Reconfigurable Particles

Published on: February 4, 2013

Synthesis of Information-bearing Peptoids and their Sequence-directed Dynamic Covalent Self-assembly
09:34

Synthesis of Information-bearing Peptoids and their Sequence-directed Dynamic Covalent Self-assembly

Published on: February 6, 2020

科学分野:

  • 超分子化学 超分子化学
  • ナノテクノロジー ナノテクノロジー
  • マテリアルサイエンス 材料科学

背景:

  • 自己組み立ては,ナノスケール構造を作成するための重要なボトムアップ戦略です.
  • 大規模で多元構成のシステムは,生物学的アセンブリを理解するために不可欠ですが,合成的に困難です.
  • 協調化学は,複雑な自己組み立てアーキテクチャを設計するための経路を提供します.

研究 の 目的:

  • 大規模で多要素の協調球を合成し,特徴づけること.
  • リガンドの幾何学に対する自己組み立ての感受性を調査する.
  • 複雑なナノスケールシステムにおける新興行動を探求する.

主な方法:

  • 自己組み立てのために使われたパラジウムイオン (M) と曲線ブリッジリングリガンド (L).
  • 巨大M24L48の協調球を合成した.
  • リガンドの曲がり角の変化に起因する構造変化を分析した.

主要な成果:

  • 24個のパラジウムイオンと48個のリガンドから巨大なM24L48の協調球を組み立てました.
  • リガンドの曲がり角のわずかな変化が,最終的な自己組み立て構造を批判的に変化させることを実証した.
  • リガンドの幾何学に基づいたM24L48とM12L24の調整球間のスイッチを観察しました.

結論:

  • 曲線リガンドの幾何学は,大規模な自己組み立ての結果を決定する.
  • 小さな幾何学的な変化から増幅された構造的変化によって特徴づけられるエマージェントな行動が観察されました.
  • この研究は,複雑な超分子構造の設計において達成可能な精密な制御を強調しています.