Details

Autor(en) / Beteiligte

• Drenchev, Nikola
• Ivanova, Elena
• Mihaylov, Mihail
• Hadjiivanov, Konstantin

Titel

CO as an IR probe molecule for characterization of copper ions in a basolite C300 MOF sample

Ist Teil von

• Physical chemistry chemical physics : PCCP, 2010-01, Vol.12 (24), p.6423-6427

Ort / Verlag

England

Erscheinungsjahr

2010

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• 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 12 CO- 13 CO 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. At 100 K some Cu 2+ sites on basolite C300 MOF sample can absorb more than one CO molecule each, part of CO is bonded to the organic ligands.