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Photoisomerization of stilbene: A spin-flip density functional theory approach

机译:二苯乙烯的光异构化:自旋翻转密度泛函理论方法

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摘要

The photoisomerization process of 1,2-diphenylethylene (stilbene) is investigated using the spin-flip density functional theory (SFDFT), which has recently been shown to be a promising approach for locating conical intersection (CI) points (Minezawa, N.; Gordon, M. S. J. Phys. Chem. A2009, 113, 12749). The SFDFT method gives valuable insight into twisted stilbene to which the linear response time-dependent DFT approach cannot be applied. In contrast to the previous SFDFT study of ethylene, a distinct twisted minimum is found for stilbene. The optimized structure has a sizable pyramidalization angle and strong ionic character, indicating that a purely twisted geometry is not a true minimum. In addition, the SFDFT approach can successfully locate two CI points: the twisted-pyramidalized CI that is similar to the ethylene counterpart and another CI that possibly lies on the cyclization pathway of cis-stilbene. The mechanisms of the cis-trans isomerization reaction are discussed on the basis of the two-dimensional potential energy surface along the twisting and pyramidalization angles.
机译:使用自旋翻转密度泛函理论(SFDFT)研究了1,2-二苯乙烯(二苯乙烯)的光异构化过程,该方法最近已被证明是定位圆锥形交点(CI)的有前途的方法(Minezawa,N. Gordon,MSJ Phys.Chem.A2009,113,12749)。 SFDFT方法为扭曲的二苯乙烯提供了有价值的见解,而线性响应时间相关的DFT方法无法应用于扭曲的二苯乙烯。与以前的SFDFT乙烯研究相反,对于二苯乙烯,发现了一个明显的扭曲最小值。优化的结构具有相当大的锥体化角和强离子特性,表明纯扭曲的几何形状不是真正的最小值。此外,SFDFT方法可以成功定位两个CI点:与乙烯对应物相似的扭曲金字塔形CI和另一个可能位于顺式-二苯乙烯环化路径上的CI。在二维势能面沿扭转角和锥化角的基础上,讨论了顺反异构化反应的机理。

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