The thermolysis of ≡Si-O-SnMe3 grafted onto partially dehydroxylated silicas has been studied by in situ IR, 13C CP MAS NMR and TPD. The only detected gaseous product was methane, showing that the thermolysis process passes through a simple hydrolysis reaction between the grafted organometallic fragment and silanol groups. This reaction leads to the formation of (≡Si-O)2SnMe2, (≡Si-O)3SnMe, and finally tin compounds without organic ligands. The relative proportions of these surface organometallic fragments have been quantitatively determined by three independent methods which gave concordant results. Due to the higher density of hydroxy groups on SiO2 200, the reactions proceed at a lower temperature on this surface. After thermal treatment at 400°C, no more methyl ligands remain on the surface and all tin species are probably present as tin(IV) compounds.
|Original language||English (US)|
|Number of pages||6|
|Journal||Journal of the Chemical Society - Faraday Transactions|
|State||Published - May 21 1997|
ASJC Scopus subject areas
- Physical and Theoretical Chemistry