The proof of the pudding is in the analysis! The mononuclearity of the metal in a zeolite-supported Rh+ catalyst with two exchangeable ethylene ligands (see picture; Rh brown, C black, Al gray, O red, Si blue) was confirmed through EXAFS studies, and its dynamic uniformity was demonstrated through variable-temperature NMR spectroscopic studies.
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Ehresmann et al. (2005) studied this question.
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