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CASSCF and CASMP2 study on the photoisomerization mechanisms of [tris(trialkylsilyl)silyl]cyclotetrasilene and related cyclobutene molecules

机译:CASSCF和CASMP2研究[三(三烷基甲硅烷基)甲硅烷基]环四硅及其相关环丁烯分子的光异构化机理

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The mechanisms for photochemical isomerization reactions are studied theoretically using the model systems, cyclotetrasilene and cyclobutene, both of which feature one four-membered-ring and one double bond, using the CAS(6,6)/6-311G(d) and CAS-MP2-(6,6)/6-311++G(3df,3pd) methods. The mechanisms, which are governed by the conical intersection concept, play a crucial role in these photorearrangement reactions, and explain the reaction pathways. The model computations demonstrate that the preferred reaction path for the photoisomerization reactions for both cyclotetrasilene and cyclobutene is as follows: four-membered-ring reactant → Franck–Condon region → conical intersection → butterfly-like photoproduct. These results allow a number of predictions to be made.
机译:使用CAS(6,6)/ 6-311G(d)和CAS对模型系统光化学异构化反应的机理进行了理论研究,模型系统为环四硅烯和环丁烯,两者均具有一个四元环和一个双键。 -MP2-(6,6)/ 6-311 ++ G(3df,3pd)方法。由锥形相交概念控制的机理在这些光重排反应中起关键作用,并解释了反应途径。模型计算表明,对于环四硅烯和环丁烯来说,光异构化反应的优选反应路径如下:四元环反应物→弗兰克–孔顿区→圆锥形交点→蝴蝶状光产物。这些结果允许做出许多预测。

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