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Hydrogen Bonds01:04

Hydrogen Bonds

15.5K
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...
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Hydrogen Bonds00:26

Hydrogen Bonds

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Hydrogen 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 unequally shared....
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Valence Bond Theory02:45

Valence Bond Theory

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Overview of Valence Bond Theory
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Hybridization of Atomic Orbitals II03:35

Hybridization of Atomic Orbitals II

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sp3d and sp3d 2 Hybridization
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Intermolecular Forces03:13

Intermolecular Forces

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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...
74.2K
Electrophiles02:28

Electrophiles

13.0K
This lesson explains the definition, classification, and characteristic features of an electrophile that are key features of nucleophilic substitution reactions. An analysis of their charge and orbital picture helps understand their reactivity for seeking electrons. Electrophiles can be classified into positive and neutral species. Other classes include free radicals and polar functional groups.
While a positive electrophile, like a proton, reacts due to its vacant, low-energy 1s orbital, the...
13.0K

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From Molecules to Materials: Engineering New Ionic Liquid Crystals Through Halogen Bonding
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From Molecules to Materials: Engineering New Ionic Liquid Crystals Through Halogen Bonding

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CF2H,水素結合ドナー

Chanan D Sessler1, Martin Rahm2, Sabine Becker1

  • 1Department of Chemistry, Massachusetts Institute of Technology , 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, United States.

Journal of the American Chemical Society
|June 4, 2017
PubMed
まとめ

CF2Hグループは,OHグループを模倣して,異常な水素結合ドナーとして作用する. この研究では,OHとCF2Hのバイオイソステリズムが確認され,分子相互作用における独特の水素結合の役割が強調された.

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科学分野:

  • 化学物理学
  • 構造化学
  • 超分子化学

背景:

  • ヒドロキシル (OH) 群は,主に水素結合によって,生物学的システムと材料において基本的な存在である.
  • 機能的群の代用体を探求することは,特異な性質を持つ新しい分子を設計するために不可欠です.
  • ディフルオロメチル (CF2H) グループは,その電子的およびステリック特性により,興味深い代替物を提示します.

研究 の 目的:

  • ディフルオロメチル (CF2H) グループの水素結合能力を調査する.
  • ヒドロキシル (OH) 群とジフロロメチル (CF2H) 群の間のバイオイソステリズムを確立する.
  • CF2H-H··Oの水素結合が分子間相互作用と分子構造に及ぼす影響を明らかにする.

主な方法:

  • 構造的特徴を決定するための結晶分析.
  • 水素結合を検出するためのスペクトロスコピー技術 (例えば,NMR,IR).
  • 相互作用とエネルギー学をモデル化するための計算化学 (DFT計算など).

主要な成果:

  • CF2Hグループは明らかに水素結合ドナーとして機能する.
  • 実験的および理論的なデータは,OHとCF2Hの間のバイオイソステリック関係を確認しています.
  • CF2H-H·O水素結合は,従来のOH·O結合と比べ,分子組立と形状に影響を与える異なる特性を有する.

結論:

  • CF2Hグループは,OH群のバイオイソステルとして機能する,活力のあるユニークな水素結合ドナーである.
  • CF2Hの水素結合は,分子間の力や構造的な風景に大きな影響を及ぼします.
  • これらの相互作用を理解することで 医薬品化学と材料科学の新たな道が開かれます