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関連する概念動画

Hydrogen Bonds01:04

Hydrogen Bonds

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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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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...
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Valence Bond Theory02:45

Valence Bond Theory

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Overview of Valence Bond Theory
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Molecular Shape and Polarity03:37

Molecular Shape and Polarity

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Dipole Moment of a Molecule
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Halogens03:01

Halogens

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Group 17 elements, known as halogens, are nonmetals. At room temperature, fluorine and chlorine are gases, bromine is a liquid, and iodine a solid. Astatine is a highly unstable radioactive element, so currently, most of its properties are unknown due to its short half-life. Tennessine is a synthetic element also predicted to be in this group. 
19.0K
Alkyl Halides02:45

Alkyl Halides

17.4K
Structural Properties
Alkyl halides are halogen-substituted alkanes wherein one or more hydrogen atoms of an alkane is replaced by a halogen atom such as fluorine, chlorine, bromine, or iodine. The carbon atom in an alkyl halide is bonded to the halogen atom, which is sp3-hybridized and exhibits a tetrahedral shape.
Unlike alkyl halides, compounds in which a halogen atom is bonded to an sp2 -hybridized carbon atom of a carbon-carbon double bond (C=C) are called vinyl halides. Whereas aryl...
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From Molecules to Materials: Engineering New Ionic Liquid Crystals Through Halogen Bonding
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溶液中のハロゲン結合:圧力下

Saber Mehrparvar1, Marcel Klinksiek2, Richard M Gauld1

  • 1Fakultät für Chemie und Biochemie, Ruhr-Universität Bochum Universitätsstraβe 150, 44801 Bochum, Germany.

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

高圧 NMR タイトルは,溶媒の選択が有機ハロゲン結合に大きく影響することを明らかにします. いくつかのルイス塩基は圧力下での結合を強化するが,他のものは意外に弱くなり,超分子化学における溶媒効果を強調する.

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科学分野:

  • 超分子化学
  • 物理有機化学
  • 化学熱力学

背景:

  • ハロゲン結合は,超分子化学における重要な非共性相互作用である.
  • これらの相互作用に対する圧力などの 外部条件の影響を理解することは 分子組成を制御するために不可欠です
  • 以前の研究は主にガス相または固体相におけるハロゲン結合に焦点を当てており,溶液中のデータは限られている.

研究 の 目的:

  • 様々な溶液環境における有機ハロゲン結合ドナーに対する高圧の影響を調査する.
  • 圧力依存ハロゲン結合における異なるルイス塩基 (オルトアミド,ハライド,チオウレア) の役割を調査する.
  • 溶液ベースのハロゲン結合における高圧の合理的な適用のための基礎を提供する.

主な方法:

  • 高圧核磁気共鳴 (HP-NMR) 定位を用いた.
  • CDCl3,CD2Cl2,アセトン-d6,THF-d8を含む複数の溶媒で実験を行った.
  • 混乱連鎖統計関連流体理論 (PC-SAFT) を用いた熱力学モデリングがデータ分析に使用された.

主要な成果:

  • 中性三角質ハロゲン結合ドナーは,テストされた溶媒のオルトアミドと圧力強化結合を示した.
  • ハリドはCDCl3,CD2Cl2,アセトン-d6でドナーとの関連定数を意外に減少させた.
  • ブロミドとチオウレア (水素結合ドナー) の結合は,高圧で弱くなり,オルトアミドと対照的であった.

結論:

  • ハロゲン結合複合体の強さを調節する上で,特に充電された種を含む溶媒効果は重要な役割を果たします.
  • 高圧は溶液中のハロゲン結合の相互作用を調整する強力なツールであり,超分子設計のための新しい道を提供します.
  • 発見は,ハロゲン結合アプリケーションを最適化するために,溶媒の選択と圧力の条件を慎重に考慮する必要がある.