the silicon compounds, structures characterized by σ–π interactions between methyl and pentafluorophenyl groups are second lowest in energy and cannot be excluded completely by the gas electron diffraction experiments. C6H5(CH2)3C6F5, in contrast, is present as a single conformer. The gas‐phase structures served as a reference for the evaluation of a series of (dispersion‐corrected) quantum‐chemical
通过氢化
硅烷化和CC偶联反应合成了三种具有(CH 2)3和(CH 2)2 SiMe 2单元桥联的苯基和
五氟苯基环的化合物。它们的固态结构受分子间π堆积相互作用的支配,主要导致二聚体或链型聚集体。通过电子衍射分析气相中的游离分子,发现最丰富的构象异构体可通过分子内π-π相互作用显着稳定。对于
硅化合物,以甲基和
五氟苯基之间的σ-π相互作用为特征的结构的能量第二低,并且不能通过气体电子衍射实验完全排除。C 6相反,H 5(CH 2)3 C 6 F 5作为单个构象异构体存在。气相结构可作为评估一系列(经色散校正的)量子
化学计算的参考。