Jove
Visualize
お問い合わせ
JoVE
x logofacebook logolinkedin logoyoutube logo
JoVEについて
概要リーダーシップブログJoVEヘルプセンター
著者向け
出版プロセス編集委員会範囲と方針査読よくある質問投稿
図書館員向け
推薦の声購読アクセスリソース図書館諮問委員会よくある質問
研究
JoVE JournalMethods CollectionsJoVE Encyclopedia of Experimentsアーカイブ
教育
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab Manual教員リソースセンター教員サイト
利用規約
プライバシーポリシー
ポリシー

関連する概念動画

Alkyl Halides02:45

Alkyl Halides

20.7K
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...
20.7K
Basicity of Aliphatic Amines01:21

Basicity of Aliphatic Amines

7.0K
Amines can behave as Brønsted–Lowry bases by accepting a proton from the acid to form corresponding conjugate acids. Due to a lone pair of nonbonding electrons, aliphatic amines can also act as Lewis bases by forming a covalent bond with an electrophile.
To measure the basicity of amines, two conventions are generally used. The first defines Kb as the basicity constant for the deprotonation reaction of water by the amine, as presented in Figure 1. Conventionally, lower Kb indicates higher...
7.0K
Ions as Acids and Bases02:54

Ions as Acids and Bases

26.9K
Salts with Acidic Ions
Salts are ionic compounds composed of cations and anions, either of which may be capable of undergoing an acid or base ionization reaction with water. Aqueous salt solutions, therefore, may be acidic, basic, or neutral, depending on the relative acid-base strengths of the salt’s constituent ions. For example, dissolving the ammonium chloride in water results in its dissociation, as described by the equation:
26.9K
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...
15.5K
Hydrogen Bonds00:26

Hydrogen Bonds

135.7K
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....
135.7K
Relative Strengths of Conjugate Acid-Base Pairs02:29

Relative Strengths of Conjugate Acid-Base Pairs

53.2K
Brønsted-Lowry acid-base chemistry is the transfer of protons; thus, logic suggests a relation between the relative strengths of conjugate acid-base pairs. The strength of an acid or base is quantified in its ionization constant, Ka or Kb, which represents the extent of the acid or base ionization reaction. For the conjugate acid-base pair HA / A−, the ionization equilibrium equations and ionization constant expressions are
53.2K

こちらも読む

関連記事

共著者、ジャーナル、引用グラフによってこの研究に関連する記事。

並び替え
Same author

Sequence-Dependent Folding of Recognition-Encoded Melamine Oligomers.

Journal of the American Chemical Society·2026
Same author

Solvent Effects on the Conformational Preferences of 2,6-Pyridylcarboxamide Foldamers.

Chemistry (Weinheim an der Bergstrasse, Germany)·2026
Same author

Negative cooperativity in the formation of two H-bonds with an oxygen H-bond acceptor.

Chemical science·2026
Same author

Prediction of Protein-Ligand Binding Affinities Using Atomic Surface Site Interaction Points.

Journal of chemical information and modeling·2026
Same author

Template-directed ligation of recognition-encoded melamine oligomers.

Chemical science·2025
Same author

Supramolecular assembly properties of a mixed-sequence recognition-encoded melamine oligomer.

Organic & biomolecular chemistry·2025

関連する実験動画

Updated: Mar 3, 2026

From Molecules to Materials: Engineering New Ionic Liquid Crystals Through Halogen Bonding
06:44

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

Published on: March 24, 2018

69.7K

アニオンに対するH結合受容体パラメータ

Sarah J Pike1, Jordan J Hutchinson2, Christopher A Hunter1

  • 1Department of Chemistry, University of Cambridge , Lensfield Road, Cambridge CB2 1EW, U.K.

Journal of the American Chemical Society
|May 5, 2017
PubMed
まとめ

この研究では,UV/VISタイトレーションを用いて様々なアニオンの水素結合強さを定量化します. アニオンH結合パラメータ (β) は,溶媒とドナー間で転送可能であり,アニオン認識の正確な予測を可能にします.

科学分野:

  • 超分子化学
  • 分析化学
  • 物理有機化学

背景:

  • 水素結合は分子認識と自己組織化において重要な役割を果たします
  • アニオンの水素結合受容体 (HBA) の強さを定量化することは,溶液中の相互作用を理解するために不可欠である.
  • 以前の研究は,特定のアニオンドナーペアまたは限られた溶媒システムに焦点を当てていた.

研究 の 目的:

  • 15アニオンの多様なセットの水素結合受容体 (HBA) パラメータ (β) を体系的に調査し,定量化する.
  • これらのHBAパラメータが,異なる中性水素結合ドナー (HBD) と有機溶媒 (クロロフォームとアセトニトリル) 間の伝達性を評価する.
  • さまざまな化学環境におけるアニオン認識特性を予測するための信頼できる方法を確立する.

主な方法:

  • アニオンと中性HBD間の水素結合複合体の形成を監視するために,UV/VIS吸収定位を使用します.
  • クロロフォームとアセトニトリルの両方で15の異なるアニオンと3つの異なるHBDを使用します.
  • 各アニオンの自己一貫したHBAパラメータ (β) を導出するために,定位データを分析する.

主要な成果:

  • ハライド,炭酸塩,硫酸塩を含む15アニオンの自己一貫したHBAパラメータ (β) を決定する.

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

3.4K
Vibrational Spectra of a N719-Chromophore/Titania Interface from Empirical-Potential Molecular-Dynamics Simulation, Solvated by a Room Temperature Ionic Liquid
08:54

Vibrational Spectra of a N719-Chromophore/Titania Interface from Empirical-Potential Molecular-Dynamics Simulation, Solvated by a Room Temperature Ionic Liquid

Published on: January 25, 2020

6.0K

関連する実験動画

Last Updated: Mar 3, 2026

From Molecules to Materials: Engineering New Ionic Liquid Crystals Through Halogen Bonding
06:44

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

Published on: March 24, 2018

69.7K
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

3.4K
Vibrational Spectra of a N719-Chromophore/Titania Interface from Empirical-Potential Molecular-Dynamics Simulation, Solvated by a Room Temperature Ionic Liquid
08:54

Vibrational Spectra of a N719-Chromophore/Titania Interface from Empirical-Potential Molecular-Dynamics Simulation, Solvated by a Room Temperature Ionic Liquid

Published on: January 25, 2020

6.0K
  • アニオンHBAのパラメータが異なる溶媒とHBDパートナー間で移転できることを実証した.
  • 極めて強いHBA (β ≈ 15) として特定された炭酸塩は,中性有機HBAを大幅に上回る.
  • ヘクサフッロフォスファートは,ピリジンと比べると,研究された中で最も弱いHBAであることが判明しました.
  • 特定の条件下で対カチオンとのイオンペアリングの無視可能な効果が確認された.

    • 結論:

    • アニオンHBAパラメータ (β) は堅牢で,予測可能なアニオン認識を可能にします.
    • アニオンのHBA強度は,その結合酸のpKaと相関しない.
    • この研究は,特定のアニオン結合能力を持つシステムを設計するための貴重な定量的な枠組みを提供します.