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The Contributions of Through-Bond Interactions to the Singlet-Triplet Energy Differencein 1,3-Dehydrobenzene

机译:1,3-脱氢苯的全键相互作用对单重态-三重态能量差的贡献

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摘要

Separation of the through-space (TS) from the through-bond (TB) interactions between the two atomic orbitalsat C(1) and C(3) of 1,3-dehydrobenzene (1) has been achieved by carrying out ab initio, valence-bond, self-consistent-field (VBSCF) calculations. The results indicate that, at the CCSD(T)/cc-pVTZ optimized geometryof the singlet state of 1, the stabilization provided by TB interactions contributes 10% more than the stabilizationprovided by the TS interactions to the adiabatic singlet—triplet energy difference. The highest occupied MOof 1 contains a contribution from hybrid AO at C(2), which has the same phase as the smaller lobes of theAOs at C(1) and C(3). Consequently, TB interactions in 1 increase with decreasing values of the C(1)-C(3)distance. The origin of this hybrid AO at C(2) and the contributions of hyperconjugation to TB and TSinteractions in 1 are described and discussed.
机译:通过进行从头开始的操作,已实现了将1,3-脱氢苯(1)的两个原子轨道C(1)和C(3)之间的穿透键(TB)相互作用与穿透空间(TS)分离,价键,自洽场(VBSCF)计算。结果表明,在CCSD(T)/ cc-pVTZ的单重态优化几何结构为1的情况下,由TB相互作用提供的稳定性比绝热单重态-三重态能量差的TS相互作用提供的稳定性大10%。最高占用的MOof 1包含C(2)处的混合AO的贡献,其相位与C(1)和C(3)处的AO的较小瓣相同。因此,TB交互作用1随着C(1)-C(3)距离值的减小而增加。描述并讨论了这种杂合AO在C(2)的起源以及超共轭对TB和TS相互作用的贡献。

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