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関連する概念動画

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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Water: A Bronsted-Lowry Acid and Base02:30

Water: A Bronsted-Lowry Acid and Base

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The reaction between a Brønsted-Lowry acid and water is called acid ionization. For example, when hydrogen fluoride dissolves in water and ionizes, protons are transferred from hydrogen fluoride molecules to water molecules, yielding hydronium ions and fluoride ions:
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Aqueous Solutions and Heats of Hydration02:42

Aqueous Solutions and Heats of Hydration

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Water and other polar molecules are attracted to ions. The electrostatic attraction between an ion and a molecule with a dipole is called an ion-dipole attraction. These attractions play an important role in the dissolution of ionic compounds in water.
When ionic compounds dissolve in water, the ions in the solid separate and disperse uniformly throughout the solution because water molecules surround and solvate the ions, reducing the strong electrostatic forces between them. This process...
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Solubility Equilibria: Ionic Product of Water01:16

Solubility Equilibria: Ionic Product of Water

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Pure water is a weak electrolyte; only a small amount ionizes into hydrogen and hydroxide ions. At any given temperature, the concentration of undissociated water is almost constant, so the ionic product of water is the product of the hydrogen and hydroxide ion concentrations, denoted as Kw. The square root of Kw gives the individual ion concentrations.
The ionic product of water varies with temperature, and its value is 1.0 x 10−14 at standard experimental conditions. Per Le...
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Van der Waals Interactions01:24

Van der Waals Interactions

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Atoms and molecules interact with each other through intermolecular forces. These electrostatic forces arise from attractive or repulsive interactions between particles with permanent, partial, or temporary charges. The intermolecular forces between neutral atoms and molecules are ion–dipole, dipole–dipole, and dispersion forces, collectively known as van der Waals forces.
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pH Scale02:41

pH Scale

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Hydronium and hydroxide ions are present both in pure water and in all aqueous solutions, and their concentrations are inversely proportional as determined by the ion product of water (Kw). The concentrations of these ions in a solution are often critical determinants of the solution’s properties and the chemical behaviors of its other solutes. Two different solutions can differ in their hydronium or hydroxide ion concentrations by a million, billion, or even trillion times. A common means of...
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水とカチオン-π相互作用

Yujie Zhu1, Minmin Tang1, Huibin Zhang1

  • 1Center for Supramolecular Chemistry & Catalysis and Department of Chemistry, College of Science, Shanghai University, 99 Shang-Da Road, Shanghai 200444, China.

Journal of the American Chemical Society
|July 30, 2021
PubMed
まとめ

水中では,合成容器は,充電されたトリメチルアモニウム群よりも,未充電のテルブチル群に強く結合する. これは,生物学的認識におけるカチオン-π相互作用に対する溶解の重要な影響を強調する.

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科学分野:

  • 超分子化学
  • 物理化学
  • 生物物理化学

背景:

  • カチオン-π相互作用と水性効果は,生物学的システムにおける分子認識を制御する重要な分子間力である.
  • これらの力を理解することは 生物学的機能を模倣する 合成システムを設計する上で 鍵となるものです
  • 以前の研究ではこれらの相互作用が調査されましたが,水性環境での直接的な比較は限られています.

研究 の 目的:

  • 水中のカチオン-π相互作用と防水効果の相対結合強さを直接比較する.
  • カチオンとπの相互作用の強さを調節するスルベーションの役割を調査する.
  • 異なるゲストグループに対する合成容器ホストの拘束力のある好みを定量化します.

主な方法:

  • 競合するトリメチルアモニウム (カチオン) とターチルブチル (水性) グループを持つ分子"ダンベル"ゲストを使用した.
  • 合成容器のホストは ゲストを縛るために 芳香的な内部表面を使用しています
  • 溶解効果の影響を評価するために水溶液に結合することを研究した.

主要な成果:

  • 合成容器は,カチオンのトリメチルアモニウム群よりも,未充電のテルブチル群の結合を好むことが一貫して示された.
  • 水中の極性トリメチルアモニウム群の溶解は,カチオン-π吸引を上回る支配的要因であることが判明した.
  • これらのカビタン複合体におけるケチオン-π相互作用よりも,タート-ブチルグループへの結合が12 kJ mol−1以上有利であった.

結論:

  • 水中の溶解効果は,水害性相互作用と比較して,カチオン-π相互作用の強さを著しく低下させる.
  • 合成容器複合体は,異なる分子間力の相対的な貢献を定量的に測定するための貴重なプラットフォームを提供します.
  • 生物学的システムにおける分子認識メカニズムについての洞察を提示し,溶媒効果を考慮する重要性を強調しています.