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Roles of Water Molecules and Counterion on HS- Sensing Reaction Utilizing a Pyrylium Derivative: A Computational Study

机译:水分子的作用及反驳利用钙衍生物的HS-感应反应:计算研究

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In this paper, we present a comprehensive computational study on the hydrogen sulfide ion (HS-) sensing mechanism in aqueous solution using pyrylium- thiopyrylium transformation. Explicit water molecules up to three water molecules are considered using supramolecular models. The effect of water bulk solvent is also taken into account according to the polarizable continuum model. Our results demonstrate that water molecules are directly involved in the sensing reactions by altering reaction mechanisms and dramatically lower the activation energies. The most favorable HS- sensing mechanism involves a 10-membered ring transition structure formed by three water molecules and one hydronium. The catalytic effects of water molecule(s) due to the alleviation of ring strain and the stabilization from deprotonated hydronium significantly lower the activation energy. The activation energies in aqueous solution decrease from 40.2 kcal/mol for the hydronium-only-catalyzed reaction to 15.7, 14.8, and 7.4 kcal/mol for one-water-, two-water-, and three-water-catalyzed mechanisms, respectively. In addition, the effect of the counterion tetrafluoroborate (BF4-) on the reaction mechanisms was also investigated. Our results demonstrate that the counterion BF4- most likely behaves as a spectator and has minor influence on the reaction mechanism.
机译:本文用钙硫钙转化对水溶液中的硫化氢离子(HS-)感测机理进行了综合计算研究。使用超分子模型考虑高达三种水分子的显式水分子。根据可极化的连续体模型,还考虑了水批量溶剂的作用。我们的结果表明,通过改变反应机制并显着降低活化能量,水分子直接参与感测反应。最有利的HS-感测机构涉及由三个水分子和一个氢的10元环过渡结构形成。水分子引起的催化作用由于戒断菌株和来自质子化氢的稳定性显着降低了活化能量。水溶液中的活化能量从40.2kcal / mol降低,用于仅催化含氢溶液的反应至15.7,14.8和7.4kcal / mol,分别用于一水 - ,双水和三水催化机制。此外,还研究了抗衡离子四氟硼酸盐(BF4-)对反应机理的影响。我们的结果表明,抗衡离子BF4-最有可能作为观众的表现,对反应机制进行了微小的影响。

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