A range of fluoride-encapsulated octasilsesquioxane cage compounds have been prepared using the TBAF route. Our studies suggest that whilst it is relatively straightforward to prepare fluoride-encapsulated octasilsesquioxane cage compounds with adjacent sp2 carbons, leading to a range of aryl and vinyl substituted compounds, the corresponding sp3 carbon derivatives are more capricious, requiring an electron withdrawing group that can stabilize the cage whilst not acting as a leaving group. Analysis by X-ray crystallography and solution 19F/29Si NMR spectroscopy of R8T8@F− reveal very similar environments for the encapsulated fluoride octasilsesquioxane cages. Migration of a fluoride ion from inside the cage to outside the cage without breaking the T8 framework and the possibility of encapsulating other anions within silsesquioxane cages have been also investigated.
一系列含
氟封装的八
硅倍半氧烷笼状化合物已经通过TBAF途径制备。我们的研究表明,虽然制备邻近sp2碳的含
氟封装的八
硅倍半氧烷笼状化合物相对直接,从而产生一系列芳基和
乙烯基取代的化合物,但相应的sp3碳衍
生物更加难以预测,需要一个能稳定笼状结构但不会作为离去基团的吸电子基团。通过X射线晶体学和溶液19F/29Si NMR光谱对R8T8@F−的分析揭示了封装
氟的八
硅倍半氧烷笼状结构内部非常相似的环境。
氟离子从笼内迁移到笼外而不破坏T8框架的可能性以及在
硅倍半氧烷笼中封装其他阴离子的可能性也得到了研究。