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Modulation of pore shape and adsorption selectivity by ligand functionalization in a series of “rob”-like flexible metal–organic frameworks
- Cepeda, Javier, Pérez-Mendoza, Manuel, Calahorro, Antonio J., Casati, Nicola, Seco, José Manuel, Aragones-Anglada, Marta, Moghadam, Peyman Z., Fairen-Jimenez, David, Rodríguez-Diéguez, Antonio
- Journal of materials chemistry 2018 v.6 no.36 pp. 17409-17416
- X-ray diffraction, adsorption, carbon dioxide, coordination polymers, dicarboxylic acids, gases, hydrogen, ligands, sieves
- We report the synthesis of a new family of four new isoreticular metal–organic frameworks (MOFs) based on Cu–Cu paddle-wheel building units. The four MOFs contain 1D microchannels modulated by chemical functionalisation of a dicarboxylate ligand or the use of different bis-4,4′-pyridyl-like connectors behaving as ancillary linkers. A deep analysis of their CO₂, H₂ and CH₄ adsorption properties, combining both experimental and grand canonical Monte Carlo isotherms as well as in situ synchrotron X-ray diffraction, shows variable adsorption behaviour towards the studied gases, with some materials acting as molecular sieves with virtually infinite selectivity.