Synthesis of functionalized silica nanostructure: Unexpected conversion of cyanopropyl group in chloropropyl one during HCl-catalysed hydrolysis of the corresponding triethoxysilane
Abstract
During acid hydrolysis of 3-cyanopropyltriethoxysilane (CyTES) in a molar ratio HCl:CyTES - 4.6:1 in methanol, with the intention to prepare the properly polyhedral oligomeric silsesquioxane (POSSQ) or carboxyl derivative, the conversion of organic functional group occurred by replacing the CN group with Cl forming octakis(chloropropyl)octasilsesquioxane (Cl-POSSQ). The structure was determined through X-ray single crystal diffraction, spectral (FTIR and NMR) techniques and elemental analysis. The stepwise conversion of the CN group during the 3-cyanopropyltriethoxysilane hydrolysis was monitored through IR and 13C NMR spectroscopy. Thermal behavior was studied by thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC). Moisture sorption capacity was evaluated by water vapor sorption in dynamic regime (DVS). The biological activity was in vitro tested against three fungi and two bacteria.
- Publication:
-
Journal of Molecular Structure
- Pub Date:
- April 2016
- DOI:
- 10.1016/j.molstruc.2016.01.043
- Bibcode:
- 2016JMoSt1110..150D
- Keywords:
-
- Cubic polyhedral silsesquioxanes;
- Synthesis;
- Structural characterization;
- Functionalized silica;
- Nanosized structures