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Modeling Small Aluminum Chlorohydrate Polymers

机译:小型氯水合铝聚合物建模

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摘要

Despite many experimental studies, the structure of aluminum chlorohydrate system is not well understood due to its complexity. Using a combination of Car Parrinello molecular dynamics and ab initio methods, we conclusively determine the structures of aluminum chlorohydrate monomer, dimer, trimer, and hexamer species. Contrary to the common assumption that the Al coordination shell in these compounds consists of OH groups and H_2O molecules only, we find that Cl~- ion incorporation in the octahedral structure of aluminum chlorohydrate monomer, dimer, and trimer increases their stability in the gas phase. The hexamer gas-phase structure is predicted to be built from both penta- and hexacoordinated Al~(3+) ions. Gas-phase optimized dimer and hexamer complexes are found to exhibit stable behavior in water solutions in the course of 7-8 ps of a Car Parrinello molecular dynamics run.
机译:尽管进行了许多实验研究,但氯水合铝系统的结构由于其复杂性而尚未得到很好的理解。结合使用Car Parrinello分子动力学和从头算方法,我们最终确定了氯水合铝单体,二聚体,三聚体和六聚体物种的结构。与通常认为这些化合物中的Al配位壳仅由OH基和H_2O分子组成的假设相反,我们发现Cl〜-离子在氯水合铝单体,二聚体和三聚体的八面体结构中的结合增加了它们在气相中的稳定性。 。六聚体气相结构预计将由五配位和六配位的Al〜(3+)离子构建。发现气相优化的二聚体和六聚体络合物在Car Parrinello分子动力学运行的7-8 ps的过程中在水溶液中表现出稳定的行为。

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