基于多HF的全维潜在能量表面发展和Cl + CH3NH2反应的准经典动态
1MTA-SZTE Lendület Computational Reaction Dynamics Research Group, Interdisciplinary Excellence Centre and Department of Physical Chemistry and Materials Science, Institute of Chemistry, University of Szeged, Rerrich Béla tér 1, Szeged H-6720, Hungary.
这项研究为Cl + CH3NH2反应开发了新的潜在能量表面,揭示了CH3侧抽取是有利的. 反应机制随着碰撞能量的变化而变化,影响产品的能量分布.
科学领域:
- 化学动力学 化学动力学
- 理论化学 理论化学
- 量子力学就是量子力学.
背景情况:
- +CH3NH2反应系统复杂,涉及多个反应道.
- 准确的潜在能量表面 (PES) 对于理解反应动态至关重要.
- 旋转轨道 (SO) 效应可以显著影响反应路径.
研究的目的:
- 为Cl + CH3NH2系统开发一个全维的,自旋轨道校正的潜在能量表面 (PES).
- 通过使用新的PES,研究抽象通道的反应动态.
- 阐明碰撞能量对反应机制和产品能量分布的影响.
主要方法:
- 使用Robosurfer程序包开发一个新的PES.
- 高级电子结构计算,包括ManyHF用于收,UCCSD(T) -F12a/cc-pVDZ-F12,以及基础集/SO校正 (RMP2-F12,MRCI+Q).
- 准经典的轨迹模拟来分析反应动态.
主要成果:
- 发现CH3侧抽取比NH2侧抽取更频繁.
- 积分横截面随着碰撞能量 (Ecoll) 的增加而减少.
- 反应机制从间接剥离转变为直接剥离,随着Ecoll的增加,偏好从接近的功能组抽象.
结论:
- 开发的SO校正的PES提供了Cl + CH3NH2反应动态的可靠描述.
- 碰撞能量显著影响反应机制和产品能量分割.
- 未来的实验研究可以通过比较计算和实验HCl ((v = 0) 旋转分布来指导.
更多相关视频
08:54Vibrational Spectra of a N719-Chromophore/Titania Interface from Empirical-Potential Molecular-Dynamics Simulation, Solvated by a Room Temperature Ionic Liquid
Published on: January 25, 2020
05:51Isotopic Effect in Double Proton Transfer Process of Porphycene Investigated by Enhanced QM/MM Method
Published on: July 19, 2019
相关概念视频
SN2 Reaction: Kinetics
In a chemical reaction, a relationship exists between the concentration of reactants and the rate at which the reaction proceeds. The study to measure this relationship is known as the kinetics of a chemical reaction. Kinetic studies are used to deduce the rate law of a chemical reaction, which provides information about the species involved during the transition state of the rate-determining step. Thus, kinetic studies help to derive the mechanism of a...
¹H NMR of Conformationally Flexible Molecules: Temporal Resolution
Stability of Substituted Cyclohexanes
The two chair conformations of cyclohexanes undergo rapid interconversion at room temperature. Both forms have identical energies and stabilities, each comprising equal amounts of the equilibrium mixture. Replacing a hydrogen atom with a functional group makes the two conformations energetically non-equivalent.
For example, in...
Valence Bond Theory and Hybridized Orbitals
A σ bond (single bond in a Lewis structure) is a covalent bond in which the electron density is...
Thermodynamic Potentials
Hybridization of Atomic Orbitals II
