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相关概念视频

VSEPR Theory and the Basic Shapes02:52

VSEPR Theory and the Basic Shapes

Overview of VSEPR Theory
Molecular Shape and Polarity03:37

Molecular Shape and Polarity

Dipole Moment of a Molecule
Ions as Acids and Bases02:54

Ions as Acids and Bases

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:
Determining the pH of Salt Solutions04:08

Determining the pH of Salt Solutions

The pH of a salt solution is determined by its component anions and cations. Salts that contain pH-neutral anions and the hydronium ion-producing cations form a solution with a pH less than 7. For example, in ammonium nitrate (NH4NO3) solution, NO3− ions do not react with water whereas NH4+ ions produce the hydronium ions resulting in the acidic solution. In contrast, salts that contain pH-neutral cations and the hydroxide ion-producing anions form a solution with a pH greater than 7. For...
Qualitative Analysis03:46

Qualitative Analysis

For solutions containing mixtures of different cations, the identity of each cation can be determined by qualitative analysis. This technique involves a series of selective precipitations with different chemical reagents, each reaction producing a characteristic precipitate for a specific group of cations. Metal ions within a group are further separated by varying the pH, heating the mixture to redissolve a precipitate, or adding other reagents to form complex ions.
For instance, group IV...
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Membrane electrodes, also known as p-ion electrodes, use membranes that selectively interact with free analyte ions, generating a potential difference across the membrane. The resulting membrane potential, known as the asymmetry potential, is not zero even when analyte concentrations on both sides of the membrane are equal. The membrane's response is typically not selective to a single analyte but proportional to the concentration of all ions in the sample solution capable of interacting at the...

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Optical Detection of E. coli Bacteria by Mesoporous Silicon Biosensors
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使用二拓盐受体识别三角形氧化离子的分子识别:证据表明酸盐离子周围的异型屏蔽表面.

Joseph M Mahoney1, Kenneth A Stucker, Hua Jiang

  • 1Department of Chemistry and Biochemistry, and Radiation Laboratory, University of Notre Dame, Notre Dame, Indiana 46556-5670, USA.

Journal of the American Chemical Society
|March 3, 2005
PubMed
概括

这项研究介绍了一种宏观循环受体,能够将单价盐提取到. 该受体通过键结合其皇冠以太环中的离子和离子,影响盐提取效率.

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科学领域:

  • 超分子化学 超分子化学
  • 有机化学 有机化学
  • 晶体工程 晶体工程

背景情况:

  • 开发用于选择性离子结合的受体在化学中至关重要.
  • 宏环受体为客分子提供独特的结合腔.

研究的目的:

  • 设计和表征一个用于同时结合阴离子和阴离子的二极管,宏观循环受体.
  • 研究受体盐复合物的结合方式和结构特征.

主要方法:

  • 用于溶液状态结构分析的NMR光谱学.
  • 为了固态结构的确定,使用X射线晶体学.
  • 密度函数理论 (DFT) 计算用于电子结构分析.

主要成果:

  • 接收器成功地将各种单价盐 (例如,KAcO,LiNO3,NaNO3) 提取到.
  • 阳离子在皇冠以太环内结合,而阳离子通过键与受体NH组相互作用.
  • 固态结构揭示了受硬体和电子因素影响的三角形氧化离子的特定方向.
  • 溶液核磁共振研究显示出异常的上场转移,归因于酸盐和酸盐离子的二磁性异性质.

结论:

  • 宏观循环受体通过阴离子协调和阴离子键的结合,证明了单价盐的有效结合.
  • 受体腔内的阳离子导向由固体,协调和结合相互作用的平衡决定.
  • 观察到的NMR转移提供了关于结合离子的电子性质和相互作用的见解.