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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...
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...
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...
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.
Molecular Shapes01:18

Molecular Shapes

Molecules have characteristic shapes that are crucial for their function. The arrangement of various electron groups around the central atom dictates their molecular geometry. Electron pairs in the valence shell of a central atom will adopt an arrangement that minimizes repulsions between the electron pairs by maximizing the distance between them. The valence electrons form either bonding pairs, located primarily between bonded atoms, or lone pairs.
Two regions of electron density in a diatomic...
Structural Isomerism02:34

Structural Isomerism

Isomerism in Complexes
Isomers are different chemical species that have the same chemical formula. Structural isomerism of coordination compounds can be divided into two subcategories, the linkage isomers and coordination-sphere isomers.
Linkage isomers occur when the coordination compound contains a ligand that can bind to the transition metal center through two different atoms. For example, the CN− ligand can bind through the carbon atom or through the nitrogen atom. Similarly, SCN− can be...

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Updated: May 30, 2026

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

分子と電子の移動は,協調性ベースの分子組を介して行われます.

Leila Motiei1, Revital Kaminker, Mauro Sassi

  • 1Department of Organic Chemistry, The Weizmann Institute of Science, Rehovot 76100, Israel.

Journal of the American Chemical Society
|August 18, 2011
PubMed
まとめ
この要約は機械生成です。

研究者は分子組成の内部構造を調査した. 薄膜の透過性と分子輸送は,薄膜の組成,分子構造,および厚さを調整することによって制御できることを発見しました.

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Structure and Coordination Determination of Peptide-metal Complexes Using 1D and 2D 1H NMR
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Structure and Coordination Determination of Peptide-metal Complexes Using 1D and 2D 1H NMR

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A Technical Guide for Performing Spectroscopic Measurements on Metal-Organic Frameworks
10:13

A Technical Guide for Performing Spectroscopic Measurements on Metal-Organic Frameworks

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関連する実験動画

Last Updated: May 30, 2026

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

Structure and Coordination Determination of Peptide-metal Complexes Using 1D and 2D 1H NMR
14:44

Structure and Coordination Determination of Peptide-metal Complexes Using 1D and 2D 1H NMR

Published on: December 16, 2013

A Technical Guide for Performing Spectroscopic Measurements on Metal-Organic Frameworks
10:13

A Technical Guide for Performing Spectroscopic Measurements on Metal-Organic Frameworks

Published on: April 28, 2023

科学分野:

  • マテリアルサイエンス 材料科学
  • 表面化学について
  • ナノテクノロジー ナノテクノロジー

背景:

  • 表面に閉じ込められた分子組成物の内部構造を理解することは,高度な材料の設計に不可欠です.
  • Layer-by-layer (LbL) で成長した薄膜は,さまざまな用途のために調整可能な性質を提供します.

研究 の 目的:

  • LbLフィルムの組成と構造とその内部特性との関係を調査する.
  • フィルム特性が分子透過性と電子伝送にどのように影響するかを決定する.

主な方法:

  • 構成や分子成分が異なる薄膜を層ごとに作る.
  • フィルム構造の体系的な分析と,機能的特性との相関関係.

主要な成果:

  • 薄膜の組成を調整することによって,LbL薄膜の透過性を体系的に制御することが実証されています.
  • 分子構成要素の構造を変更することによって,分子輸送と電子転送を調整する能力を示しました.
  • 電子伝送と対比して分子浸透を制御するための重要なパラメータとして厚さが確立されました.

結論:

  • 表面に閉じ込められた分子集合体の内部構造は,精密に設計することができます.
  • LbL膜の性質は,透過性および電子伝送を含むが,構成および構造的変更によって高度に調節可能である.
  • 厚さは,これらのシステムにおける分子浸透と電子移転のバランスを決定する上で重要な役割を果たします.