Collision Energy Dependence of the Competing Mechanisms of Reaction of Chlorine Atoms with Propene.

Collision Energy Dependence of the Competing Mechanisms of Reaction of Chlorine Atoms with Propene.
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氯原子与丙烯反应的竞争机制的碰撞能量依赖性。

DOI:
10.1021/acs.jpca.9b01370
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发表时间:
2019
期刊:
The journal of physical chemistry. A
影响因子:
--
通讯作者:
Cascarini FJJ
Cascarini FJJ
中科院分区:
--
文献类型:
--
作者:
Cascarini FJJ

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准经典的轨迹模拟检查Cl与丙烯的反应在一个范围内的碰撞能量,从7到28千焦摩尔-1。大多数(70%在7 kJ mol-1,86%在14 kJ mol-1,和93%在28 kJ mol-1)的反应轨迹产生HCl的直接抽象的氢原子从丙烯的甲基,但其余涉及各种延迟机制。在这些寿命较长的轨迹,瞬态形成的一个充满活力的1-氯丙基自由基中间体是占主导地位的,只有一个较小的贡献,从2-氯丙基自由基和漫游途径。这些中间状态之间的分支比在很大程度上是不变的碰撞能量,虽然间接轨迹的整体比例增加,在较低的碰撞能量。较长寿命的轨迹的更大的作用反映在计算的产品散射角分布,这在较低的能量变得更加各向同性。然而,在振动和转动态的产物HCl的布居分布不随碰撞能量而改变,因为它们是由动力学后期沿着反应路径。
Quasi-classical trajectory simulations examine the reaction of Cl with propene across a range of collision energies, from 7 to 28 kJ mol–1. The majority (70% at 7 kJ mol–1, 86% at 14 kJ mol–1, and 93% at 28 kJ mol–1) of reactive trajectories produce HCl by direct abstraction of a hydrogen atom from the methyl group of propene, but the remainder involve a variety of delayed mechanisms. Among these longer-lived trajectories, transient formation of an energized 1-chloropropyl radical intermediate is predominant, with only a minor contribution from the 2-chloropropyl radical and roaming pathways. The branching ratios between these intermediate states are largely invariant to collision energy, although the overall proportion of indirect trajectories increases at lower collision energies. The greater role for longer-lived trajectories is reflected in the computed product scattering angle distributions, which become more isotropic at lower energies. However, the distributions of population over vibrational and rotational states of the product HCl do not change with collision energy because they are controlled by the dynamics late along the reaction path.
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