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|Type:||Artigo de periódico|
|Title:||Thermal decomposition of [M-3(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 [M-3(CO)(12)] (M = Ru, Os) inside the pores of porous Vycor glass (PVG). The intermediate species formed during the thermal treatment of the [M-3(CO)(12)] adsorbed PVG materials were studied by UV-VIS-NIR and diffuse reflectance infrared (DR-IR) spectroscopy. At 65 degrees C (M = Ru) and 110 degrees C (M = Os), formation of surface bound [HM3(CO)(10)(mu-OSi=)] species occurs, as a result of oxidative addition of a PVG surface silanol group to a cluster M-M bond. At T > 130 degrees C (M = Ru) and T > 200 degrees C (M = Os) cluster breakdown is observed, with formation of [M(CO)(n)(OSi=)(2)] (n = 2 and/or 3) species. When [Ru-3(CO)(12)] incorporated PVG is heated in air at T > 250 degrees C, decomposition of the cluster and formation of RuO2 nanoparticles are observed. At 1200 degrees C, collapse of the glass pores leads to the formation of a transparent silica glass/RuO2 nanocomposite of particle average size 45 Angstrom.|
|Editor:||Royal Soc Chemistry|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
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