Abstract
Pure samples and as-prepared mixtures of Rh 9 and Rh 10 carbonyl clusters with interstitial P atoms have been studied quantitatively by 31P MAS and 1H– 31P CP/MAS NMR. Information on the 31P chemical shift tensor of the Rh 9 and Rh 10 clusters has been derived from spinning sideband simulations. The chemical shift anisotropy is slightly larger in the Rh 10 clusters (340–400 ppm) than in the Rh 9 clusters (230–300 ppm), while the asymmetry parameters are similar ( η=0.1–0.4). The results contribute to the understanding of the relationship between the shielding anisotropy and the structure of the cluster cavity. © 1997 Elsevier Science B.V.
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