Starting from trichloro(phenylethyl)silane, six differently fluorinated triaryl(phenylethyl)silanes were synthesized by salt elimination reactions and their structures were determined by X-ray diffraction analysis. Tris(pentafluorophenyl)(phenylethyl)silane reveals a folded structure due to intramolecular π-stacking interactions, while those with a lower degree of fluorination show either intermolecular π-stacking or no interplay between the aryl groups. A similar folded structure was observed for (4-methylphenethyl)tris(pentafluorophenyl)silane and [2-(naphth-2-yl)ethyl]tris(pentafluorophenyl)silane, both generated from the corresponding trichlorosilanes. In contrast, the inversely fluorinated [2-(pentafluorophenyl)ethyl]triphenylsilane only revealed intermolecular π-stacking interactions. Compounds with tetrafluoropyridyl substituents behave differently; with these compounds, π-stacking is only observed between the fluorinated units. All compounds were analyzed by NMR and IR spectroscopy, elemental analyses and single-crystal X-ray diffraction, and found to have strong H/C/N/F···F and N···C contacts.

中文翻译：

---

三芳基（苯乙基）硅烷的合成与结构多样性

从三氯（苯乙基）硅烷开始，通过盐消除反应合成了六种不同的氟化三芳基（苯乙基）硅烷，并通过X射线衍射分析确定了它们的结构。三（五氟苯基）（苯乙基）硅烷由于分子内π堆积相互作用而显示出折叠结构，而氟化程度较低的那些则显示出分子间π堆积或芳基之间没有相互作用。对于（4-甲基苯乙基）三（五氟苯基）硅烷和[2-（萘-2-基）乙基]三（五氟苯基）硅烷观察到相似的折叠结构，两者均由相应的三氯硅烷产生。相反，反向氟化的[2-（五氟苯基）乙基]三苯基硅烷仅显示出分子间的π-堆积相互作用。具有四氟吡啶基取代基的化合物的行为不同；对于这些化合物，仅在氟化单元之间观察到π堆积。通过NMR和IR光谱，元素分析和单晶X射线衍射分析所有化合物，发现它们具有强的H / C / N / F··F和N··C接触。