Analysis of the Acting Forces in a Theory of Catalysis and Mechanochemistry.

Analysis of the Acting Forces in a Theory of Catalysis and Mechanochemistry.
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催化和机械化学理论中的作用力分析。

DOI:
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发表时间:
2017
影响因子:
2.9
通讯作者:
J. Ribas‐Ariño
J. Ribas‐Ariño
中科院分区:
化学3区
文献类型:
--
作者:
W. Quapp;J. M. Bofill;J. Ribas‐Ariño

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通过有效势能面(PES)的产生,对分子施加机械或催化应力所产生的化学过程进行理论描述。最小值和鞍点的应力的变化描述的牛顿轨迹(NT)的原始PES。从作用力的分析,我们假设存在的拉走廊所建立的家庭的NT连接相同的固定点。对于不同高度的出口鞍,我们主要通过简单的二维表面模型讨论了相应的拉拽走廊。如果有不同的出口鞍点,那么至少在之间可以存在指数为2的鞍点。那么,一个完整的牵引走廊穿过指数为2的鞍的情况是正常情况。它导致了一个内在的滞后,这种牵引的向前或向后的反应。假设这样的关系,我们可以解释文献中的一些结果。一个新的发现是存在的迂回走廊,可以切换不同的鞍点之间的逆转的方向。这些发现涉及机械载荷以及静电力下的分子系统的机械化学,并可以扩展到催化和酶促加速反应。基本和地面附加值以一种自然的方式包括这两种力,而不需要额外的修改。
The theoretical description of a chemical process resulting from the application of mechanical or catalytical stress to a molecule is performed by the generation of an effective potential energy surface (PES). Changes for minima and saddle points by the stress are described by Newton trajectories (NTs) on the original PES. From the analysis of the acting forces we postulate the existence of pulling corridors built by families of NTs that connect the same stationary points. For different exit saddles of different height we discuss the corresponding pulling corridors; mainly by simple two-dimensional surface models. If there are different exit saddles then there can exist saddles of index two, at least, between. Then the case that a full pulling corridor crosses a saddle of index two is the normal case. It leads to an intrinsic hysteresis of such pullings for the forward or the backward reaction. Assuming such relations we can explain some results in the literature. A new finding is the existence of roundabout corridors that can switch between different saddle points by a reversion of the direction. The findings concern the mechanochemistry of molecular systems under a mechanical load as well as the electrostatic force and can be extended to catalytic and enzymatic accelerated reactions. The basic and ground ansatz includes both kinds of forces in a natural way without an extra modification.
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