Abstract
X-ray absorption spectroscopy was used to characterize the metal-support interface in catalysts consisting
of very small Ir clusters of nearly uniform nuclearity on the surface of MgO powder. [Ir4(CO)12] on MgO was converted
in high yield into [HIr4(CO)11]- and separately into [Ir6(CO)15l2-. Extended X-ray absorption fine structure (EXAFS)
data are consistent with the
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