Facile synthesis of novel functionalized silsesquioxane nanostructures containing an encapsulated fluoride anion

El Aziz, Youssef; Bassindale, Alan R.; Taylor, Peter G.; Horton, Peter N.; Stephenson, Richard A. and Hursthouse, Michael B. (2012). Facile synthesis of novel functionalized silsesquioxane nanostructures containing an encapsulated fluoride anion. Organometallics, 31(17) pp. 6032–6040.

DOI: https://doi.org/10.1021/om300277g

Abstract

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(sp³) bond), facilitates the formation and encapsulation of the fluoride anion in a silsesquioxane cage. Such species have been studied by ¹⁹F and ²⁹Si 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 ₈cage 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.

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