Covalent binding of a Fischer-type metal carbene in ordered mesoporous MCM-41-functionalized silica
Por:
Ojeda M.L., Campero A., López-Cortés J.G., Ortega-Alfaro M.C., Velasques, C, Alvarez C.
Publicada:
18 feb 2008
Resumen:
The synthesis of ordered mesoporous silicas has received extensive attention due to their ordered arrangement, large surface area, and chemical stability. The pore size and pore volume of these materials make them suitable potential matrices for hosting. Here, we show that the covalent grafting of the Fischer carbene complex of tungsten [(CO)(5)W=C(ph)OCH(2)CH(3)] onto the silanol groups in inner walls of ordered mesoporous MCM-41 silica has been successfully accomplished. The introduction of the carbene complex is made by following two distinct anchoring procedures. The first one goes through the reaction of a mesoporous silica functionalized with 3-aminopropyltriethoxy silane (APTES) and a tungsten carbene, while in the second approach a precursor previously synthesized by reacting APTES with the tungsten carbene is then anchored via a direct bond with the silanol groups of the interior mesoporous pore channels of silica. XRD, N(2) adsorption/desorption, and TEM analysis provide stro
Filiaciones:
Ojeda M.L.:
Univ Nacl Autonoma Mexico, Inst Quim, Mexico City 04510, DF, Mexico
Campero A.:
Departamento de Química, Universidad Autónoma Metropolitana-Iztapalapa, Av San Rafael Atlixco 186, PO Box 55-534, C.P. 09340 México, D.F., Mexico
López-Cortés J.G.:
Univ Nacl Autonoma Mexico, Inst Quim, Mexico City 04510, DF, Mexico
Ortega-Alfaro M.C.:
Dpto. Q. Orgánica, Facultad de Química, UNAM, Circuito Exterior, 04510 México, D.F., Mexico
Alvarez C.:
Univ Nacl Autonoma Mexico, Inst Quim, Mexico City 04510, DF, Mexico
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