Silsesquiazanes bearing different groups [RSi(NH)1.5] n (R = C12H25, Ph, H) were hydrolyzed and the resulting products were characterized. [C12H25Si(NH) 1.5]n was hydrolyzed by heating in an autoclave with water at 120 °C for 16 h. [PhSi(NH)1.5]n was hydrolyzed by heating with water at 50 ?C for 16 h. [HSi(NH)1.5]n was dispersed in water at room temperature to induce hydrolysis. In the cases of [C12H25Si(NH)1.5]n and [PhSi(NH)1.5]n, IR analysis showed that Si-NH-Si bonds remained and that terminal Si-NH2 bonds in silsesquiazane were preferentially hydrolyzed to form Si-OH bonds or Si-O-Si bonds. Solid-state 29Si CP/MAS NMR analysis revealed the formation of a Si-O-N network containing various Si environments. All the Si-H and Si-N bonds in [HSi(NH) 1.5]n, on the other hand, were converted into Si-O bonds. These results reveal that Si-O-N networks can be formed from silsesquiazanes bearing dodecyl and phenyl groups under relatively moderate conditions.
ASJC Scopus subject areas
- Inorganic Chemistry