Recursos de colección

Digital.CSIC (162.855 recursos)

Repositorio institucional del Consejo Superior de Investigaciones Científicas. Digital.CSIC es un depósito de documentos digitales, cuyo objetivo es organizar, archivar, preservar y difundir en modo de acceso abierto la producción intelectual resultante de la actividad investigadora del CSIC.

(CIN2) Artículos post-print

Mostrando recursos 1 - 12 de 12

  1. Tetradihydrobenzoquinonate and tetrachloranilate Zr(IV) complexes: Single-crystal-to-single-crystal phase transition and open-framework behavior for K4Zr(DBQ)4

    Imaz, Inhar; Roques, Nans; Sutter, Jean-Pascal
    The molecular complexes K4[Zr(DBQ)4] and K 4[Zr(CA)4], where DBQ2- and CA2- stand respectively for deprotonated dihydroxybenzoquinone and chloranilic acid, are reported. The anionic metal complexes consist of Zr(IV) surrounded by four O,O-chelating ligands. Besides the preparation and crystal structures for the two complexes, we show that in the solid state the DBQ complex forms a 3-D open framework (with 22% accessible volume) that undergoes a crystal-to-crystal phase transition to a compact structure upon guest molecule release. This process is reversible. In the presence of H2O, CO2, and other small molecules, the framework opens and accommodates guest molecules. CO2 adsorption isotherms...

  2. Self-assembled tetragonal prismatic molecular cage highly selective for anionic π guests

    Rovira, Concepció; Almeida, Manuel; Imaz, Inhar; Maspoch, Daniel; Costas, Miquel; Ribas, Xavi
    The metal-directed supramolecular synthetic approach has paved the way for the development of functional nanosized molecules. In this work, we report the preparation of the new nanocapsule 3⋅(CF3SO3)8 with a A4B2 tetragonal prismatic geometry, where A corresponds to the dipalladium hexaazamacrocyclic complex Pd-1, and B corresponds to the tetraanionic form of palladium 5,10,15,20-tetrakis(4-carboxyphenyl)porphyrin (2). The large void space of the inner cavity and the supramolecular affinity for guest molecules towards porphyrin-based hosts converts this nanoscale molecular 3D structure into a good candidate for host–guest chemistry. The interaction between this nanocage and different guest molecules has been studied by means of...

  3. Robust spin crossover platforms with synchronized spin switch and polymer phase transition

    Novio, Fernando; Evangelio, Emi; Vázquez Mera, Nuria; González-Monje, Pablo; Bellido, Elena; Mendes, S.; Kehagias, N.; Ruiz Molina, Daniel
    This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivs 3.0 Unported License.

  4. Relaxometry studies of a highly stable nanoscale metal-organic framework made of Cu(II), Gd(III), and the macrocyclic DOTP

    Carné-Sánchez, Arnau; Imaz, Inhar; Tóth, Éva; Maspoch, Daniel
    The macrocyclic ligand DOTP is used to assemble a porous, heterometallic metal-organic framework (MOF). This MOF is miniaturizable down to the nanoscale to form stable colloids, is stable in physiological saline solution and cell culture media, and is not cytotoxic. It shows interesting relaxometric properties with r1 at high field (500 MHz) of 5 mM -1·s-1 and a maximum r1 = 15 mM -1·s-1 at 40 MHz, which remains constant over a wide pH range and increases with temperature. © 2013 American Chemical Society.

  5. Extended H-bond networks based on guanidinium H-donors and [Zr(A) 4]4- H-acceptor units: modulation of the assemblage and guest accessible volume by chemical design (A = oxalate, dihydrobenzoquinonate, chloranilate)

    Roques, Nans; Imaz, Inhar; Sutter, Jean-Pascal
    Supramolecular assemblages between three different [Zr(A)4] 4- metallotectons (A stands for oxalate, Ox2-; dihydrobenzoquinonate, DBQ2-; or chloranilate CA2-) and three different guanidinium cation analogues (guanidinium, H-Guan+; 2-amino-imidazolium, H-AIm+; and N,N-dimethylguanidinium, H-DmG +) have been envisioned to investigate how the anionic and/or cationic building-block characteristics influence the connectivity and/or the dimensionality of frameworks based on charge-assisted H-bonds. Added to the benchmark material, {(H-Guan)4[Zr(Ox)4]}, (1), the crystal structures of six architectures of formula {(H-AIm)4[Zr(Ox) 4]}·5H2O (2), {(H-DmG)4[Zr(Ox) 4]}·0.5H2O (3), {(H-Guan)4[Zr(DBQ) 4]}·1.5H2O (4), {(H-Guan)4[Zr(CA) 4]}·5.85H2O (5), {(H-AIm)4[Zr(CA) 4]}·H2O (6), and {K2(H 2O)3(H-DmG)2[Zr(DBQ)4]} ·H2O (7) have been characterized. While 1 consists of a two...

  6. "Dual-Template" synthesis of one-dimensional conductive nanoparticle superstructures from coordination metal-peptide polymer crystals

    Rubio-Martínez, Marta; Puigmartí-Luis, Josep; Imaz, Inhar; Dittrich, Petra S.; Maspoch, Daniel
    Bottom-up fabrication of self-assembled structures made of nanoparticles may lead to new materials, arrays and devices with great promise for myriad applications. Here a new class of metal–peptide scaffolds is reported: coordination polymer Ag(I)-DLL belt-like crystals, which enable the dual-template synthesis of more sophisticated nanoparticle superstructures. In these biorelated scaffolds, the self-assembly and recognition capacities of peptides and the selective reduction of Ag(I) ions to Ag are simultaneously exploited to control the growth and assembly of inorganic nanoparticles: first on their surfaces, and then inside the structures themselves. The templated internal Ag nanoparticles are well confined and closely packed, conditions...

  7. Spin coupling and relaxation inside molecule–metal contacts

    Mugarza, Aitor; Krull, C.; Robles, Roberto; Stepanow, Sebastian; Ceballos, Gustavo; Gambardella, Pietro
    Advances in molecular electronics depend on the ability to control the charge and spin of single molecules at the interface with a metal. Here we show that bonding of metal–organic complexes to a metallic substrate induces the formation of coupled metal–ligand spin states, increasing the spin degeneracy of the molecules and opening multiple spin relaxation channels. Scanning tunnelling spectroscopy reveals the sign and magnitude of intramolecular exchange coupling as well as the orbital character of the spin-polarized molecular states. We observe coexisting Kondo, spin, and vibrational inelastic channels in a single molecule, which lead to pronounced intramolecular variations of the...

  8. A spray-drying strategy for synthesis of nanoscale metal-organic frameworks and their assembly into hollow superstructures

    Carné-Sánchez, Arnau; Imaz, Inhar; Cano-Sarabia, Mary; Maspoch, Daniel
    Metal-organic frameworks (MOFs) are among the most attractive porous materials known today. Their miniaturization to the nanoscale-into nanoMOFs-is expected to serve myriad applications from drug delivery to membranes, to open up novel avenues to more traditional storage and catalysis applications, and to enable the creation of sophisticated superstructures. Here, we report the use of spray-drying as a versatile methodology to assemble nanoMOFs, yielding spherical hollow superstructures with diameters smaller than 5 μm. This strategy conceptually mimics the emulsions used by chemists to confine the synthesis of materials, but does not require secondary immiscible solvents or surfactants. We demonstrate that the...

  9. A Novel Liposome-Based Nanocarrier Loaded with an LPS-dsRNA Cocktail for Fish Innate Immune System Stimulation

    Ruyra, Angels; Cano-Sarabia, Mary; MacKenzie, Simon A.; Maspoch, Daniel; Roher, Nerea
    This is an open-access article distributed under the terms of the Creative Commons Attribution License.

  10. Metal-biomolecule frameworks (MBioFs)

    Imaz, Inhar; Rubio-Martínez, Marta; Maspoch, Daniel
    Biomolecules are the building blocks of life. Nature has evolved countless biomolecules that show promise for bridging metal ions. These molecules have emerged as an excellent source of biocompatible building blocks that can be used to design Metal-Biomolecule Frameworks (MBioFs). This feature article highlights the advances in the synthesis of this class of MOFs. Special emphasis is provided on the crystal structures of these materials, their miniaturization to the submicron length scale, and their new potential storage, catalytic, and biomedical applications. © 2011 The Royal Society of Chemistry.

  11. Hydrothermal synthesis of 1D TiO2 nanostructures for dye sensitized solar cells

    Tacchini, Ignacio; Ansón Casaos, Alejandro; Yu, Youhai; Martínez Fernández de Landa, María Teresa; Lira-Cantú, Mónica
    El pdf del artículo es la versión pre-print.

  12. Three-Dimensional Open-Frameworks Based on LnIII Ions and Open-/Closed-Shell PTM Ligands: Synthesis, Structure, Luminescence, and Magnetic Properties

    Datcu, Angela; Roques, Nans; Imaz, Inhar; Maspoch, Daniel; Rovira, Concepció; Veciana Miró, Jaume
    13 páginas, 12 figuras, 2 tablas.-- et al.

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