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Abstract
In a recent study of metal adsorbates, we have observed in several model complexes that EXAFS absorber-backscatterer features for metal-metal interactions may be highly temperature dependent. This in turn can make metal-metal EXAFS undetectable in data collected at room temperature. The importance of observing these features in order to correctly identify adsorbate species in heterogeneous catalyst systems cannot be overemphasized and prompts us to give a preliminary account of our results on crystallographically characterized Rh complexes. The preliminary results of our study on a series of dinuclear rhodium model complexes and resulting adsorbed species indicate that the observation of metal-metal EXAFS can be highly temperature dependent and missing in room temperature data. For metal adsorbates, where bridged polynuclear species are possible surface species, observation of metal-metal EXAFS is critical in correctly identifying adsorbed species, and thus the collection and analysis of low temperature data is imperative. 16 refs., 1 fig.
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