Artículos AMIDORUCA
http://hdl.handle.net/10259/4364
2024-03-28T20:04:55ZPalladium nanodendrites uniformly deposited on the surface of polymers as an efficient and recyclable catalyst for direct drug modification via Z-selective semihydrogenation of alkynes
http://hdl.handle.net/10259/8459
Palladium nanodendrites uniformly deposited on the surface of polymers as an efficient and recyclable catalyst for direct drug modification via Z-selective semihydrogenation of alkynes
García Calvo, José; Calvo Gredilla, Patricia; Vallejos Calzada, Saúl; García Pérez, José Miguel; Cuevas Vicario, José Vicente; García Herbosa, Gabriel; Avella, Manuel; Torroba Pérez, Tomás
The preparation of new monodisperse polycrystalline palladium nanoparticles uniformly distributed on the surface of polymers, by simply adding a palladium(II) solution in water to the polymers, is described. The polymer supported palladium nanoparticles material was used as an efficient portable and reusable catalyst for the stereoselective semihydrogenation reaction of internal alkynes to (Z)-alkenes in green solvents.
2018-07-01T00:00:00ZSurface functionalized silica nanoparticles for the off–on fluorogenic detection of an improvised explosive, TATP, in a vapour flow
http://hdl.handle.net/10259/8384
Surface functionalized silica nanoparticles for the off–on fluorogenic detection of an improvised explosive, TATP, in a vapour flow
García Calvo, José; Calvo Gredilla, Patricia; Ibáñez Llorente, Marcos; Romero Velásquez, Daisy Carolina; Cuevas Vicario, José Vicente; García Herbosa, Gabriel; Avella, Manuel; Torroba Pérez, Tomás
We report the development of new fluorogenic silica nanomaterials that were able to generate
fluorescence in the presence of vapours of triacetone triperoxide, TATP, an improvised explosive used in
terrorist attacks. The materials worked in a vapour flow of TATP, giving a permanent and strongly
fluorescent response.
2018-02-01T00:00:00ZVersatile Rh- and Ir-Based Catalysts for CO2Hydrogenation, Formic Acid Dehydrogenation, and Transfer Hydrogenation of Quinolines
http://hdl.handle.net/10259/8383
Versatile Rh- and Ir-Based Catalysts for CO2Hydrogenation, Formic Acid Dehydrogenation, and Transfer Hydrogenation of Quinolines
Fidalgo Zorrilla, Jairo; Ruiz Castañeda, Margarita; García Herbosa, Gabriel; Carbayo Martín, Mª Aránzazu; Jalón, Félix A.; Rodríguez, Ana M.; Manzano, Blanca R.; Espino Ordóñez, Gustavo
Considering the interest in processes related to hydrogen storage such as CO2 hydrogenation and formic acid (FA) decomposition, we have synthesized a set of Ir, Rh, or Ru complexes to be tested as versatile precatalysts in these reactions. In relation with the formation of H2 from FA, the possible applicability of these complexes in the transfer hydrogenation (TH) of challenging substrates as quinoline derivatives using FA/formate as hydrogen donor has also been addressed. Bearing in mind the importance of secondary coordination sphere interactions, N,N′ ligands containing NH2 groups, coordinated or not to the metal center, were used. The general formula of the new complexes are [(p-cymene)RuCl(N,N′)]X, X = Cl–, BF4– and [Cp*MCl(N,N′)]Cl, M = Rh, Ir, where the N,N′ ligands are 8-aminoquinoline (HL1), 6-pyridyl-2,4-diamine-1,3,5-triazine (L2) and 5-amino-1,10-phenanthroline (L3). Some complexes are not active or catalyze only one process. However, the complexes [Cp*MCl(HL1)]Cl with M = Rh, Ir are versatile catalysts that are active in hydrogenation of quinolines, FA decomposition, and also in CO2 hydrogenation with the iridium derivative being more active and robust. The CO2 hydrogenation takes place in mild conditions using only 5 bar of pressure of each gas (CO2 and H2). The behavior of some precatalysts in D2O and after the addition of 9 equiv of HCO2Na (pseudocatalytic conditions) has been studied in detail and mechanisms for the FA decomposition and the hydrogenation of CO2 have been proposed. For the Ru, Ir, or Rh complexes with ligand HL1, the amido species with the deprotonated ligand are observed. In the case of ruthenium, the formate complex is also detected. For the iridium derivative, both the amido intermediate and the hydrido species have been observed. This hydrido complex undergoes a process of umpolung D+↔ Ir–D. All in all, the results of this work reflect the active role of −NH2 in the transfer of H+.
2018-11-01T00:00:00Z1,2-Azolylamidino ruthenium(ii) complexes with DMSO ligands: electro- and photocatalysts for CO2 reduction
http://hdl.handle.net/10259/8360
1,2-Azolylamidino ruthenium(ii) complexes with DMSO ligands: electro- and photocatalysts for CO2 reduction
Jennings, Murphy; Cuéllar, Elena; Rojo, Ariadna; Ferrero, Sergio; García Herbosa, Gabriel; Nganga, John; Angeles-Boza, Alfredo M.; Martín-Alvarez, Jose M.; Miguel, Daniel; Villafañe, Fernando
New 1,2-azolylamidino complexes fac-[RuCl(DMSO)3(NH[double bond, length as m-dash]C(R)az*-κ2N,N)]OTf [R = Me (2), Ph (3); az* = pz (pyrazolyl, a), indz (indazolyl, b)] are synthesized via chloride abstraction from their corresponding precursors cis,fac-[RuCl2(DMSO)3(az*H)] (1) after subsequent base-catalyzed coupling of the appropriate nitrile with the 1,2-azole previously coordinated. All the compounds are characterized by 1H NMR, 13C NMR and IR spectroscopy. Those derived from MeCN are also characterized by X-ray diffraction. Electrochemical studies showed several reduction waves in the range of −1.5 to −3 V. The electrochemical behavior in CO2 media is consistent with CO2 electrocatalytic reduction. The catalytic activity expressed as [icat(CO2)/ip(Ar)] ranged from 1.7 to 3.7 for the 1,2-azolylamidino complexes at voltages of ca. −2.7 to −3 V vs. ferrocene/ferrocenium. Controlled potential electrolysis showed rapid decomposition of the Ru catalysts. Photocatalytic CO2 reduction experiments using compounds 1b, 2b and 3b carried out in a CO2-saturated MeCN/TEOA (4 : 1 v/v) solution containing a mixture of the catalyst and [Ru(bipy)3]2+ as the photosensitizer under continuous irradiation (light intensity of 150 mW cm−2 at 25 °C, λ > 300 nm) show that compounds 1b, 2b and 3b allowed CO2 reduction catalysis, producing CO and trace amounts of formate. The combined turnover number for the production of formate and CO is ca. 100 after 8 h and follows the order 1b < 2b ≈ 3b.
2023-11-01T00:00:00Z