Model of the hydrophobic interaction

被引:44
作者
Kolomeisky, AB [1 ]
Widom, B [1 ]
机构
[1] Cornell Univ, Baker Lab, Dept Chem, Ithaca, NY 14853 USA
来源
FARADAY DISCUSSIONS | 1999年 / 112卷
关键词
D O I
10.1039/a809308c
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
The potential of mean force between interstitial solute molecules in Ben-Naim's one-dimensional, many-state lattice model (related to the one-dimensional q-state Potts model) is calculated. Since the model is exactly soluble, all results are explicit and analytic. It is found that the magnitude of the effective attractive force between solutes and the range of that attraction vary inversely with each other: the strength of the attraction, as expected, increases with increasing magnitude of the (entropically unfavorable) free energy of "hydrogen-bond'' formation, but at the same time the range decreases. Conversely, when the unfavourable entropy and favourable energy of "hydrogen-bond'' formation are nearly in balance, the attraction between hydrophobes, while then weak, is of very long range. It is remarked that solubility in a one-dimensional solution model, when the direct intermolecular interactions are of short range, can only be defined osmotically. The solubility of the hydrophobe, as so defined, is calculated with the present model. It is found to decrease with increasing temperature, as expected for a hydrophobic solute.
引用
收藏
页码:81 / 89
页数:9
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