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Quasi-Chemical Theory and the Standard Free Energy of H~+(aq)

机译:准化学理论与H〜+(aq)的标准自由能

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摘要

Quasi-chemical theory and electronic structure results on inner-sphere H(H_2O)_n~+ clusters are used to discuss the absolute hydration free energy of H~+(aq). It is noted that this quantity is not thermodynamically measurable, and this leads to some relative misalignment of available tables of absolute hydration free energies of ions in water. The simplest quasi-chemical model produces a reasonable quantitative result in the range of -256 to -251 kcal/mol. The primitive concepts on which the model is based naturally identify the Zundel cation H_5O_2~+ as the principal chemical structure contribution to this hydration free energy. the specific participation of an Eigen cation H_9O_4~+ is not required in this model because the definition of that structure depends on outer-sphere arrangements, and a crude dielectric continuum model is here used for outer-sphere contributions.
机译:利用内球H(H_2O)_n〜+团簇的准化学理论和电子结构结果讨论了H〜+(aq)的绝对水合自由能。注意,该量不是热力学上可测量的,并且这导致水中离子的绝对水合自由能的可用表的某些相对失准。最简单的准化学模型在-256至-251 kcal / mol的范围内产生合理的定量结果。该模型所基于的原始概念自然地将Zundel阳离子H_5O_2〜+识别为对该水合自由能的主要化学结构贡献。在该模型中,不需要本征阳离子H_9O_4〜+的特定参与,因为该结构的定义取决于外层球的排列,并且此处使用粗介电连续体模型作为外层球的贡献。

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