相关实验视频
Updated: Jul 16, 2026

10:37
Spatial Separation of Molecular Conformers and Clusters
Published on: January 9, 2014
离子分区图的泛化用于脂性化合物和具有可变相位体积比率的双相系统
V Gobry1, S Ulmeanu, F Reymond
1Laboratoire d'électrochimie, Ecole Polytechnique Fédérale de Lausanne, CH-1015 Lausanne, Switzerland.
Journal of the American Chemical Society
|October 25, 2001
概括
这项研究将离子分区图方法概括为双相系统中的水友和脂友化合物. 它允许使用电化学测量精确确定分区系数和解离常数.
科学领域:
- 分析化学 分析化学
- 物理化学 物理化学
背景情况:
- 离子分离图的方法对于理解双相系统中的化合物分布至关重要.
- 现有的方法在处理不同类型的化合物和可变相位比方面存在局限性.
研究的目的:
- 为了将离子分区图的方法对水友和脂友化合物进行概括.
- 将这种方法扩展到具有可变相量比率的双相系统.
- 为了使标准分区系数和离散常数的确定.
主要方法:
- 离子分区图方法的概括.
- 应用电化学测量离子转移潜力的应用.
- 确定所有分子形式的标准分区系数.
- 对单蛋白质物质的解离常数的评估.
主要成果:
- 一般化方法成功地解决了水友和脂友化合物.
- 在双相系统中有效考虑可变相位体积比率.
- 准确确定标准分区系数,包括中性形式.
- 评估解离常数和一个新的提取 pKa (pKa,ext).
结论:
- 一般化的离子分区图方法为分析双相系统中的可离子化合物提供了强大的框架.
- 电化学测量为量化分割和解离行为提供了强大的工具.
- 提取pKa的概念促进了对有机相中的酸性质的理解.
相关概念视频
Comparing Intermolecular Forces: Melting Point, Boiling Point, and Miscibility
Intermolecular forces are attractive forces that exist between molecules. They dictate several bulk properties, such as melting points, boiling points, and solubilities (miscibilities) of substances. Molar mass, molecular shape, and polarity affect the strength of different intermolecular forces, which influence the magnitude of physical properties across a family of molecules.
Temporary attractive forces like dispersion are present in all molecules, whether they are polar or nonpolar. They...
Temporary attractive forces like dispersion are present in all molecules, whether they are polar or nonpolar. They...
Phase Transitions: Melting and Freezing
Heating a crystalline solid increases the average energy of its atoms, molecules, or ions, and the solid gets hotter. At some point, the added energy becomes large enough to partially overcome the forces holding the molecules or ions of the solid in their fixed positions, and the solid begins the process of transitioning to the liquid state or melting. At this point, the temperature of the solid stops rising, despite the continual input of heat, and it remains constant until all of the solid is...
Extraction: Partition and Distribution Coefficients
The distribution law or Nernst's distribution law is the law that governs the distribution of a solute between two immiscible solvents. This law, also known as the partition law, states that if a solute is added to the mixture of two immiscible solvents at a constant temperature, the solute is distributed between the two solvents in such a way that the ratio of solute concentrations in the solvents remains constant at equilibrium.
For extracting a solute from an aqueous phase into an organic...
For extracting a solute from an aqueous phase into an organic...
Two Components: Liquid–Liquid Systems
A pressure-composition phase diagram explicitly describes the behavior of an ideal solution of two volatile liquids under varying pressures and compositions. A pressure-composition diagram has two main curves. The bubble point curve represents the plot of pressure versus liquid mole fraction. It indicates the pressure at which the first bubble of vapor forms from the liquid phase as the system pressure decreases.The dew point curve is the pressure versus vapor mole fraction. It indicates the...
Solid–Solid Solutions
The temperature-composition phase diagram of two solids, A and B, which are immiscible in the solid phase but form miscible liquids, shows that when the temperature is low, these two exist as separate, pure solids (A and B). As the temperature increases, they transition into a single-phase liquid solution where A and B coexist. Moving from point a1 to a2 in the phase diagram, the composition changes such that solid B begins to separate from the solution, enriching the remaining liquid with A.
Phase Diagrams of Ternary Systems
Consider a ternary system, which is composed of three components: water (W), ethanoic acid (E), and trichloromethane (T). Here, Ethanoic acid (E) is fully miscible with both water (W) and trichloromethane (T), meaning it can mix entirely with either of them. However, water and trichloromethane have partial miscibility, meaning they can only mix to a certain extent, beyond which two separate phases will form.The phase diagram of a ternary system is represented as an equilateral triangle, where...

