Large-scale supramolecular structure in solutions of low molar mass compounds and mixtures of liquids. III. Correlation with molecular properties and interactions.
Large-scale supramolecular structure in solutions of low molar mass compounds and mixtures of liquids. III. Correlation with molecular properties and interactions.
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低摩尔质量化合物和液体混合物溶液中的大规模超分子结构。
DOI：
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发表时间：
2006
影响因子：
3.3
通讯作者：
M. Sedlák
中科院分区：
文献类型：
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作者：
M. Sedlák
大规模的超分子结构的存在是证明在各种各样的电解质溶液，非电解质溶液，和液体的混合物。该结构包括亚微米尺寸的域，其具有与溶液的其余部分不同的溶质浓度。该系列的第一篇论文[J. Phys. Chem. B 2006，110（9），4329-4338]涉及超分子结构的详细表征，第二篇论文[J. Phys. Chem. B 2006，110（9），4339-4345]涉及该结构形成的动力学及其长期稳定性，本工作包含了一个详细的分类系统的能力，形成的超分子组织。总共研究了大约100种不同的溶质-溶剂对，涵盖了最常见的无机和有机电解质，非离子固体化合物和各种液体。使用的主要实验技术是静态和动态光散射，这是非常有效的技术，在观察和表征协会。光散射数据得到补充，通过蒸汽压渗透压测定法，这反映了不同的原则协会获得的渗透压数据。超分子结构域组织的存在和强度与组成分子和离子之间的性质和相互作用相关。在我们所知的这一阶段，对观察到的大规模超分子结构效应的最合理的解释是，由于溶质分子之间通过一个或几个溶剂分子形成的氢键桥的定向吸引相互作用而形成域，这些溶剂分子本身是氢键键合的。
The presence of a large-scale supramolecular structure is evidenced in a large variety of electrolyte solutions, nonelectrolyte solutions, and mixtures of liquids. This structure comprises submicron-sized domains with different solute concentration from that in the rest of solution. While the first paper of this series [J. Phys. Chem. B 2006, 110 (9), 4329-4338] dealt with a detailed characterization of the supramolecular structure and the second paper [J. Phys. Chem. B 2006, 110 (9), 4339-4345] dealt with the kinetics of the formation of this structure and its long-time stability, the present work contains a detailed classification of systems with respect to the capability of formation of the supramolecular organization. Around 100 different solute-solvent pairs were investigated in total, covering most common inorganic and organic electrolytes, nonionic solid compounds, and a large variety of liquids. The main experimental techniques used were static and dynamic light scattering, which are very effective techniques in observing and characterizing association. Light scattering data were complemented by osmotic pressure data obtained by vapor pressure osmometry, which reflects association on a different principle. The presence and intensity of the supramolecular domain organization was correlated with properties and interactions between constituent molecules and ions. The most plausible explanation of the observed effect of the large-scale supramolecular structure at this stage of our knowledge is that domains form due to directional attractive interactions between solute molecules via hydrogen bond bridges formed by one or several solvent molecules, which are themselves hydrogen bonded.