arXivDaily arXiv每日学术速递 周一至周五更新
arXiv physics/0506107physics.chem-phphysics.comp-ph
收藏

电子转移反应的活化熵

Activation entropy of electron transfer reactions

Anatoli A. Milischuk, Dmitry V. Matyushov, Marshall D. Newton

摘要:

本文报道了分子内电子转移反应自由能和熵的微观计算。该计算算法结合了原子的几何形状和电荷分布的分子溶质从量子计算与微观极化响应的极性溶剂表示在其极化结构因素。该程序是测试上的供体-受体复合物,其中钌供体和钴受体位点连接的四-脯氨酸多肽。重组能和反应能间隙计算作为温度的函数,通过使用从我们的分析程序和计算机模拟得到的结构因子。两个程序之间的良好协议,并与重组能量的直接计算机模拟实现。微观算法相比,介电连续计算。我们发现,重组能的溶剂折射率的连续模型预测的强烈依赖性是不支持的微观理论。此外,重组和整体溶剂化熵是大得多的微观理论相比,连续模型。

英文摘要:

We report microscopic calculations of free energies and entropies for intramolecular electron transfer reactions. The calculation algorithm combines the atomistic geometry and charge distribution of a molecular solute obtained from quantum calculations with the microscopic polarization response of a polar solvent expressed in terms of its polarization structure factors. The procedure is tested on a donor-acceptor complex in which ruthenium donor and cobalt acceptor sites are linked by a four-proline polypeptide. The reorganization energies and reaction energy gaps are calculated as a function of temperature by using structure factors obtained from our analytical procedure and from computer simulations. Good agreement between two procedures and with direct computer simulations of the reorganization energy is achieved. The microscopic algorithm is compared to the dielectric continuum calculations. We found that the strong dependence of the reorganization energy on the solvent refractive index predicted by continuum models is not supported by the microscopic theory. Also, the reorganization and overall solvation entropies are substantially larger in the microscopic theory compared to continuum models.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑