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相关概念视频

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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通过环链竞争进行超分子缓冲.

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
概括
此摘要是机器生成的。

这项研究揭示了超分子缓冲,其中分子在环链平衡中充当链,使度独立的催化活性成为可能. 这种机制提高了催化剂的稳定性,并扩大了工作度范围.

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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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科学领域:

  • 超分子化学 超分子化学
  • 催化剂是一种催化剂.
  • 物理化学 物理化学

背景情况:

  • 机体催化系统可以通过超分子相互作用实现度独立活性.
  • 超分子缓冲稳定了分子催化剂,提高了它们的强度.

研究的目的:

  • 通过环链竞争阐明超分子缓冲的设计原理.
  • 研究热力学参数对这种缓冲机制的影响.
  • 为了比较超分子缓冲与传统的pH缓冲和分子定位.

主要方法:

  • 使用了结合实验和理论方法的方法.
  • 超分子环链平衡的分析.
  • 衡量平衡常数和热力学参数的测量.

主要成果:

  • 超分子缓冲发生在分子在环链平衡中充当链时.
  • 有效的度是优化缓冲度范围和最大缓冲分子度的关键.
  • 模型预测与各种分子系统的实验数据保持一致.

结论:

  • 超分子缓冲为实现度独立催化提供了一种新的机制.
  • 了解环链平衡对于设计强大的催化系统至关重要.
  • 本文提供了对不同缓冲策略的比较视角.