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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Ions and Hydrogen Bonding in a Hydrophobic Environment: CCl4
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Ions and Hydrogen Bonding in a Hydrophobic Environment: CCl4

机译：疏水环境中的离子和氢键：CCl4

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摘要

It is generally expected that ions in an aqueous ionic solution in contact with a hydrophobic phase enter the hydrophobic phase accompanied by a hydration shell. This expectation suggests that the ion mole fraction in the hydrophobic phase is less than, or at most, equal to that of water. Both gravimetric and spectroscopic evidence shows that for a model hydrophobic phase, carbon tetrachloride, this is not the case: In contact with a 1 M simple salt solution (sodium or potassium halide), the salt concentration in carbon tetrachloride ranges from 1.4 to nearly 3 times that of water. Infrared spectra of the OH stretch region support a model in which water associates with the cation, primarily as water monomers. Salts containing larger, more polarizable anions can form outer-sphere ion pairs that support water dimers, giving rise to a spectral signature at 3440 cm-1. In CCl4 , the infrared spectral signature of the normally strongly ionized acid HCl clearly shows the presence of molecular HCl. Additionally, the presence of a Q branch for HCl indicates restricted rotational motion. The spectral and gravimetric data provide compelling evidence for ion clusters in the hydrophobic phase, which is a result that may have implications for hydrophobic matter in both biological and environmental systems.
机译：通常期望离子水溶液中与疏水相接触的离子伴随水合壳进入疏水相。该期望表明，疏水相中的离子摩尔分数小于或最多等于水的离子摩尔分数。重量法和光谱学证据均表明，对于模型疏水相四氯化碳而言并非如此：与1 M单盐溶液（钠或钾的卤化物）接触时，四氯化碳中的盐浓度范围为1.4至近3乘以水。 OH延伸区的红外光谱支持一种模型，其中水与阳离子（主要作为水单体）缔合。包含更大，更可极化的阴离子的盐可以形成支持水二聚体的外球离子对，从而在3440 cm-1处产生光谱特征。在CCl4中，正常强电离的酸HCl的红外光谱特征清楚地表明了分子HCl的存在。另外，HCl的Q分支的存在表明旋转运动受到限制。光谱和重量数据为疏水相中的离子簇提供了令人信服的证据，这可能会对生物和环境系统中的疏水物质产生影响。

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