Browsing by Subject "Metal-organic frameworks"

Now showing 1 - 3 of 3
  • Thumbnail Image
    Publication
    Open Access
    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.
  • Thumbnail Image
    Publication
    Open Access
    Mechanical bonding of rigid MORFs using a tetratopic rotaxane
    (Royal Society of Chemistry, 2024-05-28) Saura Sanmartín, Adrián; Cutillas Font, Guillermo; Martinez-Cuezva, Alberto; Alajarín, Mateo; Esteban Betegón, Fátima; Pena Sánchez, Pilar; Gándara, Felipe; Berná Cánovas, José; Química Orgánica; Nuevas Arquitecturas en Quı´mica de Materiales, Instituto de Ciencia de Materiales de Madrid (ICMM-CSIC)
    The preparation of highly rigid cobalt(II)- and copper(II)–organic frameworks incorporating a tetralactam [2]rotaxane as a ligand is described. The interlocked ligand is functionalized with two pairs of carboxylate groups placed at each counterpart, thus limiting its dynamics within the crystal. The solid structure of the metal–organic rotaxane frameworks showed different, unprecedented polycatenation modes of grids, depending on the employed metal, providing great rigidity to the structures. This rigidity has been evaluated by using single crystal X-ray diffraction analyses of the cobalt(II)–organic frameworks embedded in different solvents, observing that the lattices remain unchanged. Thus, this research demonstrates that rigid and robust materials with permanent porosity can be achieved using dynamic ligands.
  • Thumbnail Image
    Publication
    Open Access
    Photoresponsive metal-organic frameworks as adjustable scaffolds in reticular chemistry
    (Multidisciplinary Digital Publishing Institute, 2022-06-27) Saura Sanmartín, Adrián; Saura Sanmartín, Adrián; Química Orgánica
    The easy and remote switching of light makes this stimulus an ideal candidate for a large number of applications, among which the preparation of photoresponsive materials stands out. The interest of several scientists in this area in order to achieve improved functionalities has increase parallel to the growth of the structural complexity of these materials. Thus, metal-organic frameworks (MOFs) turned out to be ideal scaffolds for light-responsive ligands. This review is focused on the integration of photoresponsive organic ligands inside MOF crystalline arrays to prepare enhanced functional materials. Besides the summary of the preparation, properties and applications of these materials, an overview of the future outlook of this research area is provided.