Re2(CO)10 adsorbed on hydrated silica and alumina was found to be bonded to the surface by weak physisorption. On silica no surface reaction was detectable, while on alumina support a slow reaction with the surface took place. In-situ UV irradiation accelerated the reaction both on alumina and silica, producing (OH)4Re4(CO)12 in dramatically increased amount referring to a photochemical surface reaction starting with the homolytic splitting of the ReRe bond. The same (OH)4Re4(CO)12 could be obtained in the presence of Fe3(CO)12 cluster.
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