| Abstract
| - The characteristic CO vibrational frequency of supported monocarbonyl complexes RhICO, at2014 and 1984 cm-1 on dealuminated Y zeolite and alumina, respectively, is lower than the frequencies ofboth the symmetric and the antisymmetric CO normal modes of the corresponding stable supported Rh(I)dicarbonyls. The CO mode with a measured frequency between those of the symmetric and antisymmetricCO frequencies of the dicarbonyls, previously assigned to rhodium monocarbonyl, is reassigned to mixedcarbonyl dihydrogen complexes Rh(H2)(CO) or Rh(H)2(CO). This reassignment is based on a critical analysisof reported experimental data, supplemented by quantum chemical calculations.
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