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Buffer Effectiveness02:19

Buffer Effectiveness

58.5K
Buffer solutions do not have an unlimited capacity to keep the pH relatively constant . Instead, the ability of a buffer solution to resist changes in pH relies on the presence of appreciable amounts of its conjugate weak acid-base pair. When enough strong acid or base is added to substantially lower the concentration of either member of the buffer pair, the buffering action within the solution is compromised.
The buffer capacity is the amount of acid or base that can be added to a given volume...
58.5K
Buffers02:56

Buffers

178.6K
A solution containing appreciable amounts of a weak conjugate acid-base pair is called a buffer solution, or a buffer. Buffer solutions resist a change in pH when small amounts of a strong acid or a strong base are added. A solution of acetic acid and sodium acetate is an example of a buffer that consists of a weak acid and its salt: CH3COOH (aq) + CH3COONa (aq). An example of a buffer that consists of a weak base and its salt is a solution of ammonia and ammonium chloride: NH3 (aq) + NH4Cl...
178.6K
Complexation Equilibria: The Chelate Effect01:19

Complexation Equilibria: The Chelate Effect

1.6K
In complexation reactions, metal atoms or cations interact with ligands to form donor-acceptor adducts called metal complexes. Ligands that bind through one donor site are monodentate, ligands with two donor sites are bidentate, and those with more than two donor sites are polydentate ligands. For example, ethylene diamine is a bidentate ligand that binds through two nitrogen donor atoms, forming a five-membered ring. EDTA is a polydentate ligand that binds through four oxygen and two nitrogen...
1.6K
Regioselectivity and Stereochemistry of Acid-Catalyzed Hydration02:34

Regioselectivity and Stereochemistry of Acid-Catalyzed Hydration

10.3K
The rate of acid-catalyzed hydration of alkenes depends on the alkene's structure, as the presence of alkyl substituents at the double bond can significantly influence the rate.
10.3K
Buffers: Overview01:30

Buffers: Overview

11.0K
Buffers play a crucial role in stabilizing the pH of a solution by mitigating the effects of small amounts of added acid or base. They consist of a weak acid and its conjugate base or a weak base and its conjugate acid. A solution of acetic acid and sodium acetate is an example of a buffer that consists of a weak acid and its salt: CH3COOH (aq) + CH3COONa (aq). An example of a buffer that consists of a weak base and its salt is a solution of ammonia and ammonium chloride: NH3 (aq) + NH4Cl (aq).
11.0K
Formation of Complex Ions03:45

Formation of Complex Ions

27.1K
A type of Lewis acid-base chemistry involves the formation of a complex ion (or a coordination complex) comprising a central atom, typically a transition metal cation, surrounded by ions or molecules called ligands. These ligands can be neutral molecules like H2O or NH3, or ions such as CN− or OH−. Often, the ligands act as Lewis bases, donating a pair of electrons to the central atom. These types of Lewis acid-base reactions are examples of a broad subdiscipline called coordination...
27.1K

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Controlling the Size, Shape and Stability of Supramolecular Polymers in Water
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Controlling the Size, Shape and Stability of Supramolecular Polymers in Water

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環鎖競争による超分子バッファリング.

Tim F E Paffen1, Gianfranco Ercolani, Tom F A de Greef

  • 1Institute for Complex Molecular Systems, ‡Laboratory of Macromolecular and Organic Chemistry, and §Computational Biology, Eindhoven University of Technology , P.O. Box 513, 5600 MB Eindhoven, The Netherlands.

Journal of the American Chemical Society
|January 13, 2015
PubMed
まとめ
この要約は機械生成です。

この研究では,分子が環-鎖の均衡において鎖のストッパーとして作用し,濃度独立の触媒活動を可能にする超分子バッファリングが明らかになりました. このメカニズムは,触媒の頑丈性を高め,動作濃度範囲を広げます.

さらに関連する動画

Sedimentation Equilibrium of a Small Oligomer-forming Membrane Protein: Effect of Histidine Protonation on Pentameric Stability
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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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Construction and Systematical Symmetric Studies of a Series of Supramolecular Clusters with Binary or Ternary Ammonium Triphenylacetates

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Sedimentation Equilibrium of a Small Oligomer-forming Membrane Protein: Effect of Histidine Protonation on Pentameric Stability
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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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科学分野:

  • 超分子化学 超分子化学
  • カタリシス カタリシス カタリシス
  • 物理化学 物理化学

背景:

  • 器官触媒システムは,超分子相互作用を通じて,濃度独立の活性を達成することができます.
  • 超分子バッファリングは,分子触媒を安定させ,その強度を高めます.

研究 の 目的:

  • 環鎖競争による超分子バッファリングの設計原理を解明する.
  • このバッファリングメカニズムに対する熱力学パラメータの影響を調査する.
  • 超分子バッファリングを伝統的なpHバッファリングと分子タイトレーションと比較するために.

主な方法:

  • 実験的および理論的アプローチの組み合わせが採用されました.
  • 超分子環鎖バランスの分析.
  • 均衡定数および熱力学パラメータの測定.

主要な成果:

  • 超分子バッファリングは,分子が環-鎖の均衡においてチェーンストッパーとして作用するときに起こります.
  • 効果的なモラリティは,バッファリング濃度範囲と最大バッファリング分子濃度を最適化するための鍵です.
  • モデル予測は,様々な分子システムにおける実験データと一致しています.

結論:

  • 超分子バッファリングは,濃度独立の触媒を達成するための新しいメカニズムを提供します.
  • 環鎖のバランスを理解することは,堅牢な触媒システムの設計に不可欠です.
  • この研究は,異なるバッファリング戦略の比較的な視点を提供します.