RECONCILING THE MAGNITUDE OF THE MICROSCOPIC AND MACROSCOPIC HYDROPHOBIC EFFECTS
RECONCILING THE MAGNITUDE OF THE MICROSCOPIC AND MACROSCOPIC HYDROPHOBIC EFFECTS
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DOI：
10.1126/science.2011744
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发表时间：
1991-04-05
期刊：
影响因子：
56.9
通讯作者：
HONIG, B
中科院分区：
文献类型：
--
作者：
SHARP, KA;NICHOLLS, A;HONIG, B
疏水效应的大小，根据碳氢化合物在水中的溶解度与表面积的关系来衡量，通常被认为约为每平方埃25卡路里(卡摩尔-1埃-2)。然而，烃-水界面的表面张力，这是疏水效应的“宏观”量度，几乎等于72卡摩尔-1埃-2。为了协调这些数值，对烷烃的溶解度数据进行了重新评估，以解释溶质-溶剂尺寸的差异，从而修正了47卡·摩尔~(-1)埃-2的“微观”疏水效应。当在一个简单的几何模型中用来描述疏水效应的曲率依赖关系时，这个值可以预测接近宏观值的宏观烷烃-水表面张力。
The magnitude of the hydrophobic effect, as measured from the surface area dependence of the solubilities of hydrocarbons in water, is generally thought to be about 25 calories per mole per square angstrom (cal mol-1 angstrom-2). However, the surface tension at a hydrocarbon-water interface, which is a "macroscopic" measure of the hydrophobic effect, is almost-equal-to 72 cal mol-1 angstrom-2. In an attempt to reconcile these values, alkane solubility data have been reevaluated to account for solute-solvent size differences, leading to a revised "microscopic" hydrophobic effect of 47 cal mol-1 angstrom-2. This value, when used in a simple geometric model for the curvature dependence of the hydrophobic effect, predicts a macroscopic alkane-water surface tension that is close to the macroscopic value.