Browsing by Subject "Molecular recognition"

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    Effective encapsulation of C60 by metal-organic frameworks with polyamide macrocyclic linkers
    (WILEY-VCH VERLAG GMBH, 2021) Saura-Sanmartin, Adrian; Martinez-Cuezva, Alberto; Marín-Luna, Marta; Bautista Cerezo, Delia; Berná Cánovas, José; Química Orgánica
    A flexible benzylic amide macrocycle, functionalized with two carboxylic acid groups, was employed as the organic ligand for the preparation of robust copper(II)- and zinc(II)-based metal-organic frameworks. These polymers crystallized in the C2/m space group of the monoclinic crystal system, creating non-interpenetrated channels in one direction with an extraordinary solvent-accessible volume of 46%. Unlike metal-organic rotaxane frameworks having benzylic amide macrocycles as linkers, the absence of the thread in these novel reticular materials causes a decrease of dimensionality and an improvement of pore size and dynamic guest adaptability. We studied the incorporation of fullerene C60 inside the adjustable pocket generated between two macrocycles connected to the same dinuclear clusters, occupying a remarkable 98% of the cavities inside the network. The use of these materials as hosts for the selective recognition of different fullerenes was evaluated, mainly encapsulating the smaller size fullerene derivative in several mixtures of C60 and C70.
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    Versatile control of the submolecular motion of di(acylamino)pyridine-based [2]rotaxanes
    (2015-03-18) Martínez Cuezva, Alberto; Pastor Vivero, Aurelia; Cioncoloni, Giacomo; Orenes Martínez, Raúl Angel; Alajarín, Mateo; Symes, Mark D.; Berná Cánovas, José; Química Orgánica; WestCHEM, School of Chemistry, University of Glasgow, University Avenue, Glasgow G12 8QQ, UK
    A cyclic network of chemical reactions has been conceived for exchanging the dynamic behaviour of di(acylamino)pyridine-based rotaxanes and surrogates. X-ray diffraction studies revealed the intercomponent interactions in these interlocked compounds and were consistent with those found in solution by dynamic NMR experiments. This particular binding site was incorporated into a molecular shuttle enabled for accessing two states with an outstanding positional discrimination through chemical manipulation. Furthermore, the ability of the di(acylamino)pyridine domain to associate with external binders with a complementary array of HB donor and acceptor sites was exploited for the advance of an unprecedented electrochemical switch operating through a reversible anion radical recognition process.