Chemical reactivity and hydrophilicity studies in organic-inorganic hybrid materials have revealed that the arrangement of organic units in a silica matrix depends on the molecular structure of the precursor.
Silica gel containing benzenechromium tricarbonyl units have been obtained from molecular organosilicon precursors. The hydrolytic sol-gel polymerization of [η 6 -C 6 H 5 Si- 5), under nucleophilic catalysis by fluoride ion (NH 4 F), have led quantitatively to new monophasic hybrid organicinorganic silica gels. The derived xerogels X were characterized by FT IR, 13 C and 29 Si solid state CP MAS NMR spectroscopies. The silicon-carbon bond and the tricarbonylchromium ligand were retained within the gel. The major environment of the Si atoms corresponded to a T 2 :CSi(OR)(OSi) 2 substructure for X2-X4, a T 3 :CSi(OSi) 3 one for X1 and a Ts:CSi(OR) 2 -(OSi) in the case of X5. In most cases, these were amorphous materials that exhibited low specific surface areas (∼10 m 2 g -1 ). Upon heating the xerogels X1, X2, and X4 at 400 °C under an argon flow, weight losses corresponding to complete carbon monoxide elimination were obtained, leading to chromium in a low oxidation state within the solid.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.