首页> 外文期刊>The Journal of Chemical Physics >Liberation of H-2 from (o-C6H4Me)(3)P-H(+) + H(-)-B(p-C6F4H)(3) ion-pair: A transition-state in the minimum energy path versus the transient species in Born-Oppenheimer molecular dynamics
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Liberation of H-2 from (o-C6H4Me)(3)P-H(+) + H(-)-B(p-C6F4H)(3) ion-pair: A transition-state in the minimum energy path versus the transient species in Born-Oppenheimer molecular dynamics

机译:从(O-C6H4ME)(3)pH(+)+ H( - ) - B(P-C6F4H)(3)离子对(P-C6F4H)(3)离子对的释放:最小能量路径中的过渡状态与瞬态物种 在出生 - oppenheimer分子动力学

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Using Born-Oppenheimer molecular dynamics (BOMD) with density functional theory, transition-state (TS) calculations, and the quantitative energy decomposition analysis (EDA), we examined the mechanism of H-2-liberation from LB-H(+) + H(-)-LA ion-pair, 1, in which the Lewis base (LB) is (o-C6H4Me)(3)P and the Lewis acid (LA) is B(p-C6F4H)(3). BOMD simulations indicate that the path of H-2 liberation from the ion-pair 1 goes via the short-lived transient species, LB center dot center dot center dot H(2 center dot center dot center dot)LA, which are structurally reminiscent of the TS-structure in the minimum-energy-path describing the reversible reaction between H-2 and (o-C6H4Me)(3)P/B(p-C6F4H)(3) frustrated Lewis pair (FLP). With electronic structure calculations performed on graphics processing units, our BOMD data-set covers more than 1 ns of evolution of the ion-pair 1 at temperature T approximate to 400 K. BOMD simulations produced H-2-recombination events with various durations of H-2 remaining fully recombined as a molecule within a LB/LA attractive "pocket"-from very short vibrational-time scale to time scales in the range of a few hundred femtoseconds. With the help of perturbational approach to trajectory-propagation over a saddle-area, we directly examined dynamics of H-2-liberation. Using EDA, we elucidated interactions between the cationic and anionic fragments in the ion-pair 1 and between the molecular fragments in the TS-structure. We have also considered a model that qualitatively takes into account the potential energy characteristics of H-H recombination and H-2-release plus inertia of molecular motion of the (o-C6H4Me)(3)P/B(p-C6F4H)(3) FLP.
机译:使用Born-Oppenheimer分子动力学(BOMD)具有密度函数理论,过渡态(TS)计算和定量能量分解分析(EDA),我们研究了LB-H(+)+的H-2-解除的机制H( - ) - La离子对,1,其中Lewis碱(LB)是(O-C6H4ME)(3)P和Lewis酸(La)是B(P-C6F4H)(3)。 BOMD模拟表明,从离子对1的H-2释放的路径通过短寿命的瞬态物种,LB中心点中心点中心点H(2中心点中心点中心点)La,它们在结构上使得最小能量路径中的TS结构描述了H-2和(O-C6H4ME)(3)P / B(P-C6F4H)(3)令人沮丧的Lewis对(FLP)之间的可逆反应。在图形处理单元上执行电子结构计算,我们的BOMD数据集在温度T近似到400K的温度T. BOMD模拟产生的H-2重组事件的温度T.200k的覆盖超过1ns的离子对1。 -2剩余完全重新组合作为LB / La吸引力的“口袋”内的分子 - 从非常短的振动时间刻度到时间尺度,在几百个飞秒范围内。借助骚动地区捕获轨迹传播的捕捉方法,我们直接检查了H-2-解放的动态。使用EDA,我们阐明了离子对1中的阳离子和阴离子片段之间的相互作用以及TS结构中的分子片段。我们还考虑了一个模型,定性考虑了HH重组的势能特征,H-2-2-Seasult Plus惯性(O-C6H4ME)(3)P / B(P-C6F4H)(3) FLP。

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