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首页> 外文期刊>The journal of physical chemistry, B. Condensed matter, materials, surfaces, interfaces & biophysical >Effects of Hydrogen Bonding on Diffusion of Aromatic Compounds in Acetone: An Experimental Investigation from 268.2 to 328.2 K
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Effects of Hydrogen Bonding on Diffusion of Aromatic Compounds in Acetone: An Experimental Investigation from 268.2 to 328.2 K

机译：氢键对丙酮中芳族化合物扩散的影响：268.2至328.2 k的实验研究

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摘要

Diffusion coefficients of pseudoplanar aromatic compounds at infinite dilution in acetone have been measured at different temperatures by the Taylor dispersion technique. The data of the polar solutes that can form hydrogen bonds with acetone are compared with those of the nonpolar ones incapable of hydrogen bonding to quantify the effects of hydrogen-bonded association on diffusion. The effects are further found to correlate strongly with the overall hydrogen-bonded acidity of the polar solutes containing proton-donating groups. For the nonpolar solutes in this study, the diffusivities at different temperatures can be expressed very well by the recently developed molecular-modified fractional Stokes-Einstein relation with only two constants. An innovative model for solute diffusion in liquid solutions, which is constructed by combining the molecular-hydrodynamic relation for nonpolar solutes with the overall hydrogen-bonded acidity scale for polar solutes, is introduced for representing the diffusivities of different types of disc-shaped molecules at various temperatures. An equation developed from this model is demonstrated to be capable of calculating a total of 191 diffusion data of both the hydrogen-bonded and the nonassociated aromatic solutes in acetone from 268.2 to 328.2 K to a standard deviation of 2.7%.
机译：在丙酮无限稀释pseudoplanar芳族化合物的扩散系数都在不同温度下由泰勒分散技术进行了测量。极性溶质可以形成氢键与丙酮的数据进行比较与那些非极性键的不能形成氢键的量化上扩散氢键缔合的作用。效果进一步发现与含有质子给体基的极性溶质的总氢键酸度强烈相关。对于本研究中的非极性溶质，在不同温度下的扩散系数可以通过只用两个常量最近开发的分子改性分数斯托克斯 - 爱因斯坦关系表示非常好。在液体溶液的溶质扩散，这是通过组合用于与整个氢键酸度规模为极性溶质非极性溶质的分子的流体动力学关系构造，一种创新的模型引入用于在表示不同类型的盘形分子的扩散系数不同的温度。从这个模型开发的方程式证明能够共两者的191个扩散数据的计算的氢键键合和在丙酮中非伴生芳香族溶质从268.2到328.2 K至2.7％的标准偏差。

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