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Conformational Dependence of s-Electron Delocalization in Linear Chains: Permethylated Oligosilanes

机译:线性链中s电子离域的构象依赖性:全甲基化低聚硅烷

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摘要

The effects of s-electron delocalization on optical properties of satACHTUNGTRENUNGurated linear chains of permethylated oligosilanes are strongly conformation dependent. We analyze the origin of the conformational dependence of the energies of molecular orbitals and of electronic excitations in simple intuitively understandable terms by using a first-order approximation to the Huckel version of the “Ladder C” model. The analysis is supported by comparison with results of numerical calculations from time-dependent density functional theory, which agree well with experiment. To facilitate the comparison, a simple procedure has been developed that defines the overall and local fractional s and p characters of a backbone molecular orbital and a fractional overall and local σσ* and σπ* characters of an excited state for any conformation of a linear chain.
机译:s-电子离域对全甲基化低聚硅烷的饱和饱和钨酸脲醛化线性链的光学性能的影响强烈依赖于构象。通过使用对“梯形图C”模型的Huckel版本的一阶近似,我们以简单易懂的术语分析了分子轨道和电子激发能的构象依赖性的起源。通过与时变密度泛函理论的数值计算结果进行比较,可以支持该分析,该结果与实验非常吻合。为了便于比较,已开发出一种简单的程序,该程序定义了主链分子轨道的整体和局部分数s和p特性以及线性结构的任何构象的激发态的整体和局部分数σσ*和σπ*特性。

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