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Calculation of the ~(29)Si NMR chemical shifts of aqueous silicate species

机译:硅酸盐水溶液的〜(29)Si NMR化学位移的计算

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摘要

A DFT methodology for calculating ~(29)Si NMR chemical shifts of silicate species typically present prior to nucleation in zeolite synthesis solutions, incorporating solvent effects through an implicit representation is presented. We demonstrate how our methodology can reproduce the experimentally observed spectra and, by comparison to well characterized peaks in two different experimental studies, demonstrate the transferability and robustness of the methodology. We discuss certain cases in which caution must be exercised when implicit solvent representations are used for calculating silicate cluster geometries: those cases in which intramolecular hydrogen bonding can play a significant role in the geometry. A number of reassignments of previous tentative experimental assignments are proposed, and we also make assignments for the challenging substituted four-ring species. We present all of our computed chemical shift for previously observed species together with a number of other viable silicate clusters to serve as a reference point for future experimental studies.
机译:提出了一种DFT方法,用于计算通常在沸石合成溶液中成核之前存在的硅酸盐种类的〜(29)Si NMR化学位移,并通过隐含表示法结合了溶剂效应。我们展示了我们的方法如何重现实验观察到的光谱,并通过与两个不同实验研究中特征明确的峰进行比较,证明了该方法的可传递性和鲁棒性。我们讨论某些情况下,当使用隐式溶剂表示形式计算硅酸盐簇的几何形状时必须谨慎行事:分子内氢键在几何形状中起重要作用的那些情况。提出了一些对先前实验性实验任务的重新分配,并且我们还对具有挑战性的四环物质进行了分配。我们介绍了先前观察到的物种的所有计算出的化学位移,以及许多其他可行的硅酸盐簇,以作为未来实验研究的参考点。

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