Abstract
The interaction of Re 2(CO) 10 and Mn 2(CO) 10 with highly dehydroxylated γ-A1 2O 3 is studied by means of a detailed examination of the IR spectra corresponding to increasing amounts of adsorbed metal carbonyl. Adsorption occurs via O-bonding between an axial CO ligand and Lewis acid centres present at the γ-Al 2O 3 surface. These are mainly bulk tetrahedral and bulk octahedral Al 3+ ions emerging on the surface. It is shown that the interaction between the adsorbed molecule and γ-Al 2O 3 is strong enough to cause a pronounced alteration of the IR spectrum of the metal carbonyl. Two sets of IR absorption bands are observed in the carbonyl stretching region. These are respectively assigned to M 2(CO) 10 (M = Mn, Re) interacting with two types of surface sites of different Lewis acid strengths.
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