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arXiv 1905.09009physics.chem-phphysics.comp-ph
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水介质反应动力学的从头算增强分子动力学:尿素分解的例子

Kinetics of aqueous media reactions via ab initio enhanced molecular dynamics: the case of urea decomposition

Daniela Polino, Michele Parrinello

摘要:

水溶液为化学合成、工业过程、环境化学和生物功能中的许多重要反应提供了介质。公认的事实是,水性溶剂可以直接参与反应过程,而不仅仅是作为简单的被动溶剂。因此,辅助水分子和质子线对于许多反应的效率至关重要。本文采用增强的从头算分子动力学模拟方法研究了尿素分解为氨和异氰酸的反应。我们强调的作用,溶剂分子和它们与反应物的相互作用提供了一个适当的描述的反应机理和水氢键网络如何影响反应动力学。反应自由能和速率已计算考虑到这一重要影响。

英文摘要:

Aqueous solutions provide a medium for many important reactions in chemical synthesis, industrial processes, environmental chemistry, and biological functions. It is an accepted fact that aqueous solvents can be direct participants to the reaction process and not act only as simple passive dielectrics. Assisting water molecules and proton wires are thus essential for the efficiency of many reactions. Here we study the decomposition of urea into ammonia and isocyanic acid by means of enhanced ab initio molecular dynamics simulations. We highlight the role of the solvent molecules and their interactions with the reactants providing a proper description of the reaction mechanism and how the water hydrogen-bond network affects the reaction dynamics. Reaction free energy and rates have been calculated taking into account this important effect.

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。

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