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|Type:||Artigo de periódico|
|Title:||Thermal Decomposition Of [m3(co)12] (m = Ru, Os) Physisorbed Onto Porous Vycor Glass: A Route To A Glass/ruo2 Nanocomposite|
|Abstract:||This paper reports the preparation and characterization of oxide/glass nanocomposites, obtained by the impregnation and thermal decomposition of the trinuclear metal carbonyl clusters[M3(CO)12] (M = Ru, Os) inside the pores of porous Vycor glass (PVG). The intermediate species formed during the thermal treatment of the [M3(CO)12] adsorbed PVG materials were studied by UV-VIS-NIR and diffuse reflectance infrared (DR-IR) spectroscopy. At 65°C (M-Ru) and 110°C (M = Os), formation of surface bound [HM3(CO)10(μ- OSi≃)] species occurs, as a result of oxidative addition of a PVG surface silanol group to a cluster M-M bond. At T > 130°C (M = Ru) and T > 200°C (M = Os) cluster breakdown is observed, with formation of [M(CO)(n)(OSi≃)2] (n = 2 and/or 3) species. When [Ru3(CO)12] incorporated PVG is heated in air at T >250°C, decomposition of the cluster and formation of RuO2 nanoparticles are observed. AT 1200 °C, collapse of the glass pores leads to the formation of a transparent silica glass/RuO2 nanocomposite of particle average size 45 Å.|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
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