Browsing by Subject "Macrocycles"

Now showing 1 - 2 of 2
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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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    Molecular release by the rotaxane and pseudorotaxane approach
    (Wiley-VCH GmbH, 2025-03-06) Peñaranda-Navarro, Raquel; Collados-Salmerón, María; Carrilero-Flores, Elena; Saura Sanmartín, Adrián; Química Orgánica
    The controlled release of target molecules is a relevant application in several areas, such as medicine, fragrance chemistry and catalysis. Systems which pursue this implementation require a fine-tune of the start and rate of the release, among other properties. In this scenario, rotaxane- and pseudorotaxane-based systems are postulated as ideal scaffolds to accomplish a precise cargo release, due to the special features provided by the intertwined arrangement. This short review covers advances towards the controlled release of different molecules using rotaxane- and pseudorotaxane-based systems, both in solution and in the solid state.