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関連する概念動画

Hydrogen Bonds01:04

Hydrogen Bonds

7.7K
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...
7.7K
Intermolecular Forces03:13

Intermolecular Forces

56.2K
Atoms and molecules interact through bonds (or forces): intramolecular and intermolecular. The forces are electrostatic as they arise from interactions (attractive or repulsive) between charged species (permanent, partial, or temporary charges) and exist with varying strengths between ions, polar, nonpolar, and neutral molecules. The different types of intermolecular forces are ion–dipole, dipole–dipole, hydrogen bonds, and dispersion; among these, dipole–dipole, hydrogen...
56.2K
Intermolecular vs Intramolecular Forces03:00

Intermolecular vs Intramolecular Forces

84.8K
Intermolecular forces (IMF) are electrostatic attractions arising from charge-charge interactions between molecules. The strength of the intermolecular force is influenced by the distance of separation between molecules. The forces significantly affect the interactions in solids and liquids, where the molecules are close together. In gases, IMFs become important only under high-pressure conditions (due to the proximity of gas molecules). Intermolecular forces dictate the physical properties of...
84.8K
VSEPR Theory02:37

VSEPR Theory

8.7K
Valence shell electron-pair repulsion theory (VSEPR theory) enables us to predict the molecular structure around a central atom from an examination of the number of bonds and lone electron pairs in its Lewis structure. The VSEPR model assumes that electron pairs in the valence shell of a central atom will adopt an arrangement that minimizes repulsions between these electron pairs by maximizing the distance between them. The electrons in the valence shell of a central atom form either bonding...
8.7K
Radical Reactivity: Intramolecular vs Intermolecular01:33

Radical Reactivity: Intramolecular vs Intermolecular

1.7K
Radical reactions can occur either intermolecularly or intramolecularly. In an intermolecular radical reaction, a nucleophilic radical adds to an electrophilic alkene or vice versa. In such reactions, the radical and generally the alkene, which is also called the radical trap, are two different molecules. Additionally, for such intermolecular reactions to occur, the radical trap must be active, present in an excess concentration, and the radical starting material must have a weak...
1.7K
VSEPR Theory and the Effect of Lone Pairs04:01

VSEPR Theory and the Effect of Lone Pairs

41.5K
Effect of Lone Pairs of Electrons on Molecule Geometry
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Updated: May 15, 2025

Construction and Systematical Symmetric Studies of a Series of Supramolecular Clusters with Binary or Ternary Ammonium Triphenylacetates
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分子内H結合系における排斥を明らかにする

Ivan V Smolyar1, Scott L Cockroft1

  • 1EaStCHEM School of Chemistry, University of Edinburgh, Joseph Black Building, David Brewster Rd, Edinburgh, EH9 3FJ, United Kingdom.

Journal of the American Chemical Society
|April 7, 2025
PubMed
まとめ
この要約は機械生成です。

分子内H結合の近くの置換物は,その強さを破壊する. この研究は 引き寄せではなく 排斥が これらの効果を誘発し 分子設計や 薬剤開発に 影響を及ぼしていることを示しています

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Spatial Separation of Molecular Conformers and Clusters
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関連する実験動画

Last Updated: May 15, 2025

Construction and Systematical Symmetric Studies of a Series of Supramolecular Clusters with Binary or Ternary Ammonium Triphenylacetates
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Construction and Systematical Symmetric Studies of a Series of Supramolecular Clusters with Binary or Ternary Ammonium Triphenylacetates

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From Molecules to Materials: Engineering New Ionic Liquid Crystals Through Halogen Bonding
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Spatial Separation of Molecular Conformers and Clusters
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科学分野:

  • 化学について
  • 分子生物学
  • 物理化学

背景:

  • 分子内の水素結合は,様々な化学的および生物学的プロセスにおける分子構造と機能に不可欠である.
  • ハメット分析のような古典的なモデルは,H-ボンドのエネルギーに対するオルト代替剤の影響を完全に説明できていません.
  • これらの相互作用を理解することは 合理的な薬剤設計,触媒,および超分子化学にとって不可欠です

研究 の 目的:

  • 分子内の水素結合のエネルギーに オーソシブシチュエントの影響を調査する.
  • 密接な分子接触における 引き寄せ力の常識的な理解に 挑戦する
  • H結合の強度と分子構成に対する置換剤の影響を予測するための新しい枠組みを提供すること.

主な方法:

  • 合成分子バランスを使って H-ボンドのエネルギーを実験的に測定した.
  • 吸引力と排斥力の貢献を 分解するために 計算化学を用いた.
  • 観察されたH-ボンドの性質と相関する傾向を分析した.

主要な成果:

  • オーソサプリメントは,外部相互作用と競合することで,分子内H結合エネルギーに著しく影響を与える.
  • 排斥的な HO··R 相互作用は,安定する OH··R 結合よりも,しばしば支配的な要因である.
  • 実験的傾向は,古典的なハメット分析に基づいた予測に逆らった.

結論:

  • 分子内H結合と分子構成に対するオルトサブシチュエント効果を理解するための新しい枠組みが提示されています.
  • この研究は 分子相互作用とデザインにおける 排斥の重要な役割を強調しています
  • この発見は 密接な分子接触における 吸引力に関する直感的な仮定に 異議を唱え 化学的設計に 新たな洞察をもたらします