Facile Synthesis of Novel Functionalized Silsesquioxane Nanostructures Containing an Encapsulated Fluoride Anion
摘要:
The presence of strongly electron withdrawing groups on alkoxysilanes, EWG-(CH2)(n)-Si(OEt)(3) (where n = 1-3 and the electron-withdrawing group EWG contains an Si-C(sp(3)) bond), facilitates the formation and encapsulation of the fluoride anion in a silsesquioxane cage. Such species have been studied by F-19 and Si-29 NMR spectroscopy and X-ray crystallography together with MALDI-TOP and ESI mass spectrometry, The EWG must not be a good leaving group. Interestingly, this strategy led only to the T-8 cage and excellent yields were obtained (81-95%) even without solvent. A wide range of functionalities were used. This new route offers an opportunity to build novel nanometer-sized 3-D molecular structures with a variety of functionalities which have not been accessible in the past.
Facile Synthesis of Novel Functionalized Silsesquioxane Nanostructures Containing an Encapsulated Fluoride Anion
作者:Youssef El Aziz、Alan R. Bassindale、Peter G. Taylor、Peter N. Horton、Richard A. Stephenson、Michael B. Hursthouse
DOI:10.1021/om300277g
日期:2012.9.10
The presence of strongly electron withdrawing groups on alkoxysilanes, EWG-(CH2)(n)-Si(OEt)(3) (where n = 1-3 and the electron-withdrawing group EWG contains an Si-C(sp(3)) bond), facilitates the formation and encapsulation of the fluoride anion in a silsesquioxane cage. Such species have been studied by F-19 and Si-29 NMR spectroscopy and X-ray crystallography together with MALDI-TOP and ESI mass spectrometry, The EWG must not be a good leaving group. Interestingly, this strategy led only to the T-8 cage and excellent yields were obtained (81-95%) even without solvent. A wide range of functionalities were used. This new route offers an opportunity to build novel nanometer-sized 3-D molecular structures with a variety of functionalities which have not been accessible in the past.