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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >A Quantum Mechanical Investigation of the Nature of the Dative Bond in Crystalline 1-Chlorosilatrane
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A Quantum Mechanical Investigation of the Nature of the Dative Bond in Crystalline 1-Chlorosilatrane

机译:晶体1-氯硅杂环戊烷中键合性质的量子力学研究

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摘要

The molecular geometry of crystalline 1-chlorosilatrane is computed at the self-consistent field (SCF) and density functional theory (DFT) levels of theory with the 6-31G~* basis set and compared with experiment. The calculations reproduce the shortening of the Si-N distance in the crystal relative to the gas phase, in agreement with existing experimental data for methyl- and fluorosilatrane. The bond shortening is shown to be the result of a combination of a conformational change in the molecule and dipole-dipole interactions with the surrounding molecules in the crystal. The importance of the need to include long-range interactions in the calculation is demonstrated. The calculated electron density of chlorosilatrane is analyzed in terms of the natural bond orbital formalism (NBO), natural resonance theory (NRT), and the theory of atoms in molecules (AIM).
机译:用6-31G〜*基集在理论的自洽场(SCF)和密度泛函理论(DFT)水平上计算了结晶1-氯硅环烷的分子几何结构,并与实验进行了比较。计算结果表明,相对于气相而言,晶体中Si-N距离的缩短与现有的甲基和氟硅碳烷酮的实验数据一致。所示键缩短是分子中构象变化以及与晶体中周围分子的偶极-偶极相互作用的结合的结果。说明了在计算中包括远程交互的需求的重要性。根据自然键轨道形式学(NBO),自然共振理论(NRT)和分子中原子理论(AIM)分析了氯硅烷基的计算电子密度。

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