Combined Theoretical and Experimental Investigation of CO Adsorption on Coordinatively Unsaturated Sites in CuBTC MOF

ChemPhysChem - Tập 13 Số 2 - Trang 488-495 - 2012
Miroslav Rubeš1, Lukáš Grajciar1, Ota Bludský2, Andrew D. Wiersum3, Philip L. Llewellyn3, Petr Nachtigall1
1Department of Physical and Macromolecular Chemistry, Faculty of Science, Charles University in Prague, Hlavova 2030, 12840 Prague 2 (Czech Republic), Fax: (+420) 221 951 289
2Center for Biomolecules and Complex Molecular Systems, Institute of Organic Chemistry and Biochemistry, AS ČR, Flemingovo nám. 2, 16610 Prague (Czech Republic)
3Laboratoire Chimie Provence, Université d'Aix-Marseille I, II et III, CNRS (UMR 6264), Centre de St Jérôme, 13397 Marseille Cedex 20 (France)

Tóm tắt

AbstractThe adsorption of CO in metal–organic framework CuBTC material is investigated by a combination of theoretical and experimental approaches. The adsorption enthalpy of CO on CuBTC determined experimentally to be −29 kJ mol−1 at the zero‐coverage limit is in very good agreement with the adsorption enthalpy calculated at the combined DFT–ab initio level with the periodic model. Calculations show that polycarbonyl complexes cannot be formed on regular coordinatively unsaturated sites in CuBTC. Experimental IR spectra of the CO probe molecule adsorbed in CuBTC are interpreted based on calculated CO stretching frequencies. Calculations show that long‐range interactions are insignificant for the CO/CuBTC system and that this system can be accurately modeled with just a Cu2(HCOO)4 cluster model of the paddle wheel. The reliability of various methods for the description of CO interaction with the Cu2+ site in CuBTC is discussed based on the experimental results and accurate coupled‐cluster calculations. It is shown that standard exchange‐correlation functionals do not provide a reliable description of CO interaction with coordinatively unsaturated Cu2+ sites in CuBTC.

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ChemPhysChem

Tập 13 Số 2

488-495

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