Martín León, Nazario

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First Name
Last Name
Martín León
Universidad Complutense de Madrid
Faculty / Institute
Ciencias Químicas
Química Orgánica
Química Orgánica
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Now showing 1 - 6 of 6
  • Publication
    Site‐Specific Reduction‐Induced Hydrogenation of a Helical Bilayer Nanographene with K and Rb Metals: Electron Multiaddition and Selective Rb + Complexation
    (Wiley, 2021-12-07) Zhou, Zheng; Fernández García, Jesús M.; Zhu, Yikun; Evans, Paul J.; Rodríguez, Rafael; Crassous, Jeanne; Wei, Zheng; Fernández López, Israel; Petrukhina, Marina A.; Martín León, Nazario
  • Publication
    Hexakis [60]Fullerene Adduct-Mediated Covalent Assembly of Ruthenium Nanoparticles and Their Catalytic Properties
    (Wiley, 2017-08) Leng, Faqiang; Gerber, Iann C.; Lecante, Pierre; Bentaleb, Ahmed; Muñoz, Antonio; Illescas Martínez, Beatriz M.; Martín León, Nazario; Melinte, Georgian; Ersen, Ovidiu; Martínez, Hervé; Axet, Rosa; Serp, Philippe
    The C66(COOH)12 hexa-adduct has been successfully used as a building block to construct via carboxylate bridges 3D networks with very homogeneous sub-1.8 nm ruthenium nanoparticles. The obtained nanostructures are active in nitrobenzene selective hydrogenation.
  • Publication
    Catalytic Stereodivergent Synthesis of Steroid–Fulleropyrrolidine Hybrids
    (ACS, 2017-04-13) Suarez, Margarita; Ruiz, Alberto; Almagro, Luis; Coro, Julieta; Maroto, Enrique E.; Filippone, Salvatore; Molero, Dolores; Martínez-Alvarez, Roberto; Martín León, Nazario
    The diastereoselective synthesis of cis and trans steroid-fulleropyrrolidines hybrids by reaction of N-metalated azomethine ylides [Cu(II) or Ag(I)] with the appropriate chiral ligand and C60 is described. The experimental findings reveal that the azomethine ylide stabilized by an allylic group cycloadds to [60]fullerene in an efficient manner and with a good diastereomeric excess. Furthermore, the new generated stereocenters are fully controlled by the catalytic systems used without being influenced by the chirality of the steroid. Interestingly, by this synthetic methodology the each one of the four possible stereoisomers have efficiently been obtained and characterized by CD spectra.
  • Publication
    An Ultra‐Long‐Lived Triplet Excited State in Water at Room Temperature: Insights on the Molecular Design of Tridecafullerenes
    (Wiley-VCH, 2021) Ramos Soriano, Javier; Pérez Sánchez, Alfonso; Ramírez Barroso, Sergio; Illescas, Beatriz M.; Azmani, Khalid; Rodríguez Fortea, Antonio; Poblet, Josep M.; Hally, Cormac; Nonell, Santi; García Fresnadillo, David; Rojo, Javier; Martín León, Nazario
    Suitably engineered molecular systems exhibiting triplet excited states with very long lifetimes are important for high-end applications in nonlinear optics, photocatalysis, or biomedicine. We report the finding of an ultra-long-lived triplet state with a mean lifetime of 93 ms in an aqueous phase at room temperature, measured for a globular tridecafullerene with a highly compact glycodendrimeric structure. A series of three tridecafullerenes bearing different glycodendrons and spacers to the C60 units have been synthesized and characterized. UV/Vis spectra and DLS experiments confirm their aggregation in water. Steady-state and time-resolved fluorescence experiments suggest a different degree of inner solvation of the multifullerenes depending on their molecular design. Efficient quenching of the triplet states by O2 but not by waterborne azide anions has been observed. Molecular modelling reveals dissimilar access of the aqueous phase to the internal structure of the tridecafullerenes, differently shielded by the glycodendrimeric shell.
  • Publication
    Fullerenes for Catalysis: Metallofullerenes in Hydrogen Transfer Reactions
    (RSC, 2017-04-17) Vidal, Sara; Marco Martínez, Juan; Filippone, Salvatore; Martín León, Nazario
    [60]Fullerene hybrids have succesfully been used as catalysts in hydrogen transfer reactions, namely ketones reduction and Nalkylation with alcoholes. Due to the poor solubility in polar solvent, these hybrids behave as homogeneous/heterogeneous catalysts that can be mechanically separated and reused for several times while the final products do not need chromatographic separation.
  • Publication
    Benzotrithiophene-Based Hole-Transporting Materials for 18.2% Perovskite Solar Cells
    (Wiley, 2016-05-17) Molina Ontoria, Agustín; Zimmermann, Iwan; García Benito, Inés; Gratia, Paul; Roldán Carmona, Cristina; Aghazada, Sadig; Graetzel, Michael; Khaja Nazeeruddin, Mohammad; Martín León, Nazario
    New star-shaped benzotrithiophene (BTT)-based hole-transporting materials (HTM) BTT-1, BTT-2 and BTT-3 have been obtained through a facile synthetic route by crosslinking triarylamine-based donor groups with a benzotrithiophene (BTT) core. The BTT HTMs were tested on solution-processed lead trihalide perovskite-based solar cells.Power conversion efficiencies in the range of 16% to 18.2% were achieved under AM 1.5 sun with the three derivatives. These values are comparable to those obtained with todays most commonly used HTM spiro-OMeTAD, which point them out as promising candidates to be used as readily available and cost-effective alternatives in perovskite solar cells (PSCs).