Abstract
Infrared spectra reveal the formation of rhodium carbonyls after interaction between supported rhodium chloride and CO at 372 K. With silica as a support, only a dicarbonyl species involving Rh I is seen, and very limited formation of an acylrhodium entity takes place if CH 3I is present. With magnesium oxide as a support, a similar dicarbonyl unit is formed but, in addition, a monocarbonyl complex can be seen, particularly after co-adsorption of CH 3I. No acylrhodium species are produced in this case. A small amount of Rh III monocarbonyl is detected when CO adsorption occurs on the magnesium oxide supported sample, and the extent of formation may be increased by treatment of the surface with oxygen. Carbonyls involving Rh III are not seen with silica as a support. Methoxide formation on magnesium oxide, resulting from the adsorption and subsequent surface reactions of CH 3I, is proposed, whereas on silica only physical adsorption of CH 3I is observed.
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