Alkyl surface modification of nanoporous silica SBA-15 by click chemistry to obtain triazole products

Document Type : Research Paper

Abstract

In this study, Santa Barbara Amorphous (SBA-15) mesoporous silica has been functionalized
with aminopropyl groups that were converted to propargyl-bearing moieties through the reaction with
propargyl bromide. The material then underwent an efficient Cu(I)-catalyzed azide alkyne click reaction
with sodium azide in order to obtain the corresponding triazole products. The covalent modification of
mesoporous silica surface with organic functional groups was confirmed by different characterization
techniques including Fourier transform infrared spectroscopy, thermogravimetric analysis, Scanning
electron microscopy, Transmission electron microscopy, N2 adsorption-desorption isotherms and Raman
spectroscopy. The results have confirmed that SBA-15 was successfully functionalized with organic
moieties. No change in the periodic structure of the SBA-15 silica support was observed throughout the
grafting procedure. Surface area, pore size and pore volume decreased by attaching functional groups
to the pore surface. This approach provides a simple and convenient route to efficiently functionalize a
wide range of new structures on the surface of SBA-15.

Keywords