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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >A coupled car-parrinello molecular dynamics and EXAFS data analysis investigation of aqueous Co2+
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A coupled car-parrinello molecular dynamics and EXAFS data analysis investigation of aqueous Co2+

机译:水溶液中Co2 +的耦合汽车-帕里尼罗分子动力学和EXAFS数据分析研究

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摘要

We have studied the microscopic solvation structure of Co2+ in liquid water by means of density functional theory ( DFT)-based Car-Parrinello molecular dynamics ( CPMD) simulations and extended X-ray absorption fine structure ( EXAFS) data analysis. The effect of the number of explicit water molecules in the simulation box on the first and second hydration shell structures has been considered. Classical molecular dynamics simulations, using an effective two-body potential for Co2+-water interactions, were also performed to show box size effects in a larger range. We have found that the number of explicit solvent molecules has a marginal role on the first solvation shell structural parameters, whereas larger boxes may be necessary to provide a better description of the second solvation shell. Car-Parrinello simulations were determined to provide a reliable description of structural and dynamical properties of Co2+ in liquid water. In particular, they seem to describe both the first and second hydration shells correctly. The EXAFS signal was reconstructed from Car-Parrinello simulations. Good agreement between the theoretical and experimental signals was observed, thus strengthening the microscopic picture of the Co2+ solvation properties obtained using first-principle simulations.
机译:我们已经通过基于密度泛函理论(DFT)的Car-Parrinello分子动力学(CPMD)模拟和扩展X射线吸收精细结构(EXAFS)数据分析的方法研究了液态水中Co2 +的微观溶剂化结构。已经考虑了模拟盒中显式水分子数目对第一和第二水合壳结构的影响。还进行了经典的分子动力学模拟,利用有效的两体电势进行Co2 +-水相互作用,以显示更大范围内的盒子尺寸效应。我们已经发现,显式溶剂分子的数量对第一溶剂化壳结构参数具有边际作用,而可能需要更大的盒子来提供对第二溶剂化壳的更好描述。确定了Car-Parrinello模拟以提供液态水中Co2 +的结构和动力学性质的可靠描述。特别地,它们似乎正确地描述了第一和第二水合壳。 EXAFS信号是根据Car-Parrinello模拟重建的。观察到理论和实验信号之间的良好一致性,从而加强了使用第一原理模拟获得的Co2 +溶剂化性质的微观图像。

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