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相关概念视频

Aqueous Solutions and Heats of Hydration02:42

Aqueous Solutions and Heats of Hydration

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...
Solubility03:00

Solubility

Solution, Solubility, and Solubility Equilibrium
A solution is a homogeneous mixture composed of a solvent, the major component, and a solute, the minor component. The physical state of a solution—solid, liquid, or gas—is typically the same as that of the solvent. Solute concentrations are often described with qualitative terms such as dilute (of relatively low concentration) and concentrated (of relatively high concentration).
In a solution, the solute particles (molecules, atoms, and/or ions)...
Aldehydes and Ketones with Water: Hydrate Formation01:20

Aldehydes and Ketones with Water: Hydrate Formation

An oxygen-based nucleophile, like water, can undergo addition reactions with aldehydes and ketones. The reaction leads to the formation of hydrates, also referred to as 1,1-diols or geminal diols.
The formation of hydrates is a reversible reaction. Hydrate formation is influenced by steric and electronic factors accompanying the alkyl substituents on the carbonyl group: The rate of hydrate formation increases with a decrease in the number of alkyl groups attached to the carbonyl carbon. Hence,...
Titration in Nonaqueous Solvents01:16

Titration in Nonaqueous Solvents

Most acid-base titrations are performed in an aqueous medium. In aqueous titrations, water competes with weaker acids or bases for proton donation or acceptance, leading to ambiguous endpoints in the titration curve. Water also affects the partial ionization of weak acids or bases. For example, water accepts a proton from acetic acid to form hydronium and acetate ions. The hydronium ion formed is a stronger acid than acetic acid, and the acetate ion is a stronger base than water. As a result,...
Precipitation and Co-precipitation01:17

Precipitation and Co-precipitation

Precipitation and coprecipitation methods can be used to separate a mixture of ions in a solution. In qualitative inorganic analysis, ions that form sparingly soluble precipitates with the same reagent are separated based on the differences in solubility products. For example, consider the separation of Cu(II) and Fe(II) ions by precipitation as insoluble sulfides. First, copper(II) sulfide is precipitated by the addition of acidic H2S, where the dissociation of H2S is suppressed. Adding H2S...
Catalysis01:27

Catalysis

Catalysis influences the rate of chemical reactions by providing an alternative reaction pathway with lower activation energy. A catalyst speeds up a reaction, but it is not consumed during the process. The fundamental principle of catalysis is the ability of a catalyst to alter the reaction mechanism, often introducing a more efficient pathway than the uncatalyzed process.In a catalyzed reaction, the catalyst participates directly in the reaction mechanism. It interacts with reactants to form...

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相关实验视频

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Synthesis of Hydrogels with Antifouling Properties As Membranes for Water Purification
07:32

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Published on: April 7, 2017

溶解物探头水化在特定的协会的环氧德克斯和阿达曼坦.

Daniel Harries1, Donald C Rau, V Adrian Parsegian

  • 1Laboratory of Physical and Structural Biology, National Institute of Child Health and Human Development, National Institutes of Health, Bethesda, Maryland 20892-0924, USA. harries@helix.nih.gov

Journal of the American Chemical Society
|February 17, 2005
PubMed
概括
此摘要是机器生成的。

贝塔-环氧德 (CD) 和阿达曼坦碳酸盐 (AD) 的结合会释放水. 与CD/AD结合的溶液相互作用显示了水化变化和力-力补偿效应.

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Heterogeneous Removal of Water-Soluble Ruthenium Olefin Metathesis Catalyst from Aqueous Media Via Host-Guest Interaction
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In situ FTIR Spectroscopy as a Tool for Investigation of Gas/Solid Interaction: Water-Enhanced CO2 Adsorption in UiO-66 Metal-Organic Framework
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In situ FTIR Spectroscopy as a Tool for Investigation of Gas/Solid Interaction: Water-Enhanced CO2 Adsorption in UiO-66 Metal-Organic Framework

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科学领域:

  • 超分子化学 超分子化学
  • 物理化学 物理化学
  • 生物物理化学 生物物理化学

背景情况:

  • 贝塔-环氧德克斯 (CD) 和阿达曼坦碳酸盐 (AD) 形成了纳入复合体.
  • 溶剂效应,包括水化和溶解物相互作用,显著影响结合热力学.
  • 了解这些相互作用对于分子识别和药物输送应用至关重要.

研究的目的:

  • 量化beta-cyclodextrin与阿达曼坦碳酸盐在添加各种溶液后的结合自由能量的变化.
  • 调查优先水和溶解物排除在结合过程中的作用.
  • 阐明溶解物对宿主-客人复合的作用的热力学基础.

主要方法:

  • 微热量计用于测量CD-AD协会的结合热力学 (,,自由能量) 在不同溶液的存在下.
  • 溶液的透压变化以探测结合常数和优先水的变化.
  • 用蒸汽压力奥斯米度独立评估反应剂和产品的水合度.

主要成果:

  • CD-AD协会释放15-25个水分子,表明水分的显著变化.
  • 溶液的类型会影响水化变化,反映了与反应物或产品的优先相互作用.
  • 在所有溶液中观察到一个很大的变化,与不同程度的补偿.
  • 释放的水的数量与溶解物对空气-水表面张力的影响相关.

结论:

  • 从交互表面的溶液排除驱动在CD-AD复合体形成过程中偏好的水合的变化.
  • 度-度补偿在调节结合热力学方面发挥着关键作用,以应对不同的溶液.
  • 这些发现为控制溶液与宿主相互作用的力量及其对分子识别的影响提供了洞察力.