Abstract
Laser Raman spectroscopy has been used to characterize a family of iridium cluster carbonyls, including [Ph[sub 4]P][HIr[sub 4](CO)[sub 11]], [K][HIr[sub 4](CO)[sub 11]], [Ir[sub 4](CO)[sub 12]], and [Ph[sub 4]P][sub 2][HIr[sub 8](CO)[sub 22]] in methanol solution and in the solid state. A supported analogue of [HIr[sub 4](CO)[sub 11]][sup [minus]] was prepared by adsorption of [Ir[sub 4](CO)[sub 12]] on MgO that had been treated at 400[degrees]C. It was identified on the basis of comparisons with the Raman spectra of the molecular clusters listed above. High-quality Raman spectra were recorded for the MgO-supported [HIr[sub 4](CO)[sub 11]][sup [minus]] containing 6 wt % Ir, but the Raman spectra of the MgO-supported [HIr[sub 4](CO)[sub 11]][sup [minus]] containing only 1 wt % Ir are of such low quality that no clear identification of the supported species was possible. 25 refs., 9 figs.
Published Version
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