CO as an IRprobe molecule for characterization of copper ions in a basolite C300 MOF sample
Literature Information
Nikola Drenchev, Elena Ivanova, Mihail Mihaylov, Konstantin Hadjiivanov
The state of the accessible copper ions in a Cu-basolite C300 sample (copper benzene-1,3,5-tricarboxylate) was studied by CO as an IR probe molecule. Low temperature CO adsorption on a sample activated at 473 K results in a series of carbonyl bands. Three intense sharp bands at 2141, 2128 and 2123 cm−1 are very sensitive to the CO equilibrium pressure and are associated with CO polarized by the aromatic ring. Three bands, at ca. 2192, 2178 and 2148 cm−1 are assigned to three different kinds of monocarbonyl species. At high CO coverage, the principal carbonyls (2178 cm−1) are converted into polycarbonyls. A band at 2125 cm−1 (resistant to evacuation) is associated with Cu+ ions on small CuO particles. Experiments on 12CO–13CO adsorption revealed lack of vibrational coupling and also showed that the bands at 2192 and 2148 cm−1, although changing almost in concert, were due to individual species. Sample activated at 373 K does not contain copper oxide, which indicates that activation at higher temperatures, 473 K, leads to some irreversible changes.
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