Abstract
Chemisorption of NO on Rh/Al/sub 2/O/sub 3/ surfaces has been examined by FT-IR. The spectra are assigned to two forms of Rh(NO) as well as the Rh(NO)/sub 2/ species. Apparent interconversion of the linear nitrosyl and dinitrosyl complexes is readily observed at room temperature. The dinitrosyl complex is characterized both by an invariant ratio of 1743- and 1825-cm/sup -1/ asymmetric and symmetric stretch bands with coverage and by isotopic data in /sup 15/NO and the mixed /sup 14/NO and /sup 15/NO systems. Force constants for NO stretching motions and for NO/NO ligand interactions on Rh(NO)/sub 2/ have been used to successfully calculate the experimentally observed spectrum for the mixed isotope, dinitrosyl species. Thermal desorption data and displacement of adsorbed NO with CO are also reported. 27 references, 9 figures, 2 tables.
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