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関連する概念動画

Hydrogen Bonds00:26

Hydrogen Bonds

Hydrogen BondsHydrogen bonds are weak attractions between atoms that have formed other chemical bonds. One of these atoms is electronegative, like oxygen, and has a partial negative charge. The other is a hydrogen atom that has bonded with another electronegative atom and has a partial positive charge.Hydrogen Bonds Control the World!Because hydrogen has very weak electronegativity when it binds with a strongly electronegative atom, such as oxygen or nitrogen, electrons in the bond are...
Hydrogen Bonds01:04

Hydrogen Bonds

A hydrogen bond is formed when a weakly positive hydrogen atom already bonded to one electronegative atom (for example, the oxygen in the water molecule) is attracted to another electronegative atom from another polar molecule, such as water (H2O), hydrogen fluoride (HF), or ammonia (NH3). The huge electronegativity difference between the H atom (2.1) and the atom to which it is bonded (4.0 for an F atom, 3.5 for an O atom, or 3.0 for an N atom), combined with the very small size of an H atom...
Complexation Equilibria: The Chelate Effect01:19

Complexation Equilibria: The Chelate Effect

In complexation reactions, metal atoms or cations interact with ligands to form donor-acceptor adducts called metal complexes. Ligands that bind through one donor site are monodentate, ligands with two donor sites are bidentate, and those with more than two donor sites are polydentate ligands. For example, ethylene diamine is a bidentate ligand that binds through two nitrogen donor atoms, forming a five-membered ring. EDTA is a polydentate ligand that binds through four oxygen and two nitrogen...
EDTA: Chemistry and Properties01:22

EDTA: Chemistry and Properties

Polydentate ligands are most widely used in complexometric titrations because they form more stable complexes with the metal ions than mono- or bidentate ligands due to the chelate effect. Examples of polydentate ligands are ethylenediaminetetraacetic acid (EDTA), crown ethers, and cryptands. The most important feature of optimal polydentate ligands is the ability to form 1:1 complexes in a single-step process. Amino carboxylic acid derivatives are frequently used as complexing agents. EDTA is...
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...
Valence Bond Theory02:45

Valence Bond Theory

Overview of Valence Bond Theory

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関連する実験動画

Updated: Jun 20, 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

AAA-DDD トリプル水素結合複合体

Barry A Blight1, Amaya Camara-Campos, Smilja Djurdjevic

  • 1School of Chemistry, University of Edinburgh, The King's Buildings, West Mains Road, Edinburgh EH9 3JJ, United Kingdom.

Journal of the American Chemical Society
|September 15, 2009
PubMed
まとめ
この要約は機械生成です。

研究者は,カチオンのAAA-DDD複合体を使って,これまでで最も強い三重水素結合システムを達成しました. この複合体は,例外的に高い結合定数を示し,この特定の水素結合配列の力を示しています.

さらに関連する動画

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

The Synthesis, Characterization and Reactivity of a Series of Ruthenium N-triphosPh Complexes
10:51

The Synthesis, Characterization and Reactivity of a Series of Ruthenium N-triphosPh Complexes

Published on: April 10, 2015

関連する実験動画

Last Updated: Jun 20, 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

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

The Synthesis, Characterization and Reactivity of a Series of Ruthenium N-triphosPh Complexes
10:51

The Synthesis, Characterization and Reactivity of a Series of Ruthenium N-triphosPh Complexes

Published on: April 10, 2015

科学分野:

  • 超分子化学 超分子化学
  • 化学物理 化学物理
  • 有機化学 オーガニック・ケミストリー

背景:

  • AAA-DDDパターンは,3つの連続した水素結合センターの最適な配置を表し,分子種の間の関連性を最大限にします.
  • 以前の研究では,中性およびカチオン性AAA-DDDシステムの下限値が確立され,有意な結合強度が示されました.

研究 の 目的:

  • 新型カチオン系AAA-DDDシステムの結合定数を合成し,正確に定量化する.
  • このシステムにおける結合強さの強化に貢献する構造的特徴を調査する.

主な方法:

  • 新しいカチオンのAAA-DDD複合体の合成 (6*10+).
  • (1) H NMRスペクトロスコーピーを用いて結合定数 (K(a)) の決定.
  • 水素結合と静電相互作用の構造的配置を解明するためのX線結晶学.

主要な成果:

  • カチオンの複合体6*10+は,室温で二塩基メタンの3×1010M-1の記録的な結合定数 (K(a)) を示した.
  • X線構造分析により,短く並行する3つの一次水素結合 (NH...N距離1.95-2.15 Å) の平面配列が明らかになった.
  • これらの主要な水素結合は,陽子と隣接する受容体原子の間の有意な静電相互作用によって強化されます.

結論:

  • AAA-DDD配列は,特にカチオン系では,前例のない結合強度を達成することができます.
  • 短く並行する水素結合と静電補強を含む正確な構造的構成は,分子結合を最大化するために極めて重要です.