Reactivity of Metal Carbonyl Clusters in Zeolites

This section is a summary of the reactivities of metal carbonyls supported in cages (Ikble 4-6). 

Ikble 4-6. Reactions of metal carbonyl clusters in zeolite cages. 

Reaction class Ouster Zeolite Resultant structure in zeolite Characterization methods Refe. 

In summary, the interactions of the carbonyl ligands of rhodium and iridium carbonyl clusters with the Lewis add sites in zeolites are indicated by shifts in the stretching frequendes of the CO ligands, and the pattern parallels that observed for metal carbonyl clusters in solutions containing Lewis adds and on surfaces of metal oxides containing Lewis add sites. 

An important consequence of the effects of the adduct formation on the Vco infrared spectra of encaged metal carbonyl clusters is that the spectra of dusters with bridging carbonyl groups, which are rather strongly basic, are significantly shifted from those of the clusters in neutral solvents, and identification by comparison with the spectra of the same dusters in solution is usually not straightforward. This point has not always been appredated in the literature. 

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