Operando infrared spectroscopy evidence of formation hydrosiliconate anion during the interaction between triethoxysilane and hydroxyl-containing anion-exchange resins

The in situ study of the interaction between triethoxysilane and a free hydroxyl anion-containing anion-exchange resin using the FTIR spectroscopy method showed the formation of the pentacoordinated silicon-containing anion, namely trialkoxyhydroxyhydrosiliconate anion. In the present work, the SiH and SiOH group bands of the formed hydrosiliconate anion are assigned. The ethylmethylketone reduction by triethoxysilane in the presence of the free hydroxyl anion-containing anion exchange resin was found to give an alcohol-derived product. The changes in the FTIR spectra recorded in situ that are taking place during the reduction are discussed.