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- W2005714891 abstract "The surface reactivity of Ir4(CO)12 supported on silica has been investigated by means of Fourier-transform infrared spectroscopy, X-ray photoelectron spectroscopy and temperature-programmed decomposition techniques. The initial stage of physisorption from a solution results in the deposition of large crystallites (ϕ > 2µ) of Ir4(CO)12, unevenly distributed on the surface. By thermal treatment in vacuum at 100 °C the complete sublimation of Ir4(CO)12 occurs. By heating under Ar or O2 at 100 °C a disaggregation of the crystallites to single Ir4(CO)12 units evenly distributed on the surface is observed. Admission of water vapour at 25 °C promotes a high surface mobility of the Ir4(CO)12 units towards reaggregation. The formation of metallic particles is achieved by thermal decomposition of well dispersed Ir4(CO)12 in Ar at 150–200 °C or at lower temperatures in H2. The adsorption of CO at 100 °C leads to disruption of large metallic particles. This surface process is enhanced by a preliminary study under O2 at 25 °C." @default.
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- W2005714891 date "1992-01-01" @default.
- W2005714891 modified "2023-10-11" @default.
- W2005714891 title "Surface organometallic chemistry: physisorption and thermal decomposition of Ir4(CO)12 on silica" @default.
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- W2005714891 doi "https://doi.org/10.1039/ft9928800369" @default.
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