Publicaciones 2011-2020

@article{RN302,
title = {Molybdenum Trioxide Thin Films Doped with Gold Nanoparticles Grown by a Sequential Methodology: Photochemical Metal-Organic Deposition (Pmod) and Dc-Magnetron Sputtering},
author = { C. Castillo and G. Buono-Core and C. Manzur and N. Yutronic and R. Sierpe and G. Cabello and B. Chornik},
url = {/brokenurl#<Go to ISI>://WOS:000378145500014},
doi = {10.4067/S0717-97072016000100014},
issn = {0717-9707},
year = {2016},
date = {2016-01-01},
journal = {Journal of the Chilean Chemical Society},
volume = {61},
number = {1},
pages = {2816-2820},
abstract = {Gold nanoparticles (AuNPs) were deposited by DC-magnetron sputtering onto molybdenum trioxide (MoO3) thin films grown by Photochemical Metal-Organic Deposition (PMOD) on Si(100) and borosilicate glass substrates. The chemical, optical and morphology properties of the films were studied by UV/Vis Spectroscopy, Scanning Electron Microscopy (SEM), X-Ray Photoelectron Spectroscopy (XPS), and X-Ray Diffraction (XRD). SEM revealed that AuNPs formed after 5 s of sputtering. AuNPs are spherical and have both an average diameter of 18 nm and a relatively narrow size distribution. As the deposition time increases, larger structures are formed by an aggregation of AuNPs. XPS studies of the AuNP/MoO3 films on Si(100) showed the presence of Mo(VI) and Mo(V), which indicated that the films were primarily non-stoichiometric molybdenum oxides. The occurrence of oxygen vacancies in the substrate play an important role to stabilize the AuNPs.},
keywords = {catalysis, diffraction, films, moo3, nanostructures, optical-properties, oxidation, oxide-films, oxides, photoelectron resonance, selective size, spectroscopy, sputtering, support, surface-plasmon temperature, thin x-ray xps},
pubstate = {published},
tppubtype = {article}
}

@article{RN202,
title = {Luminescent Gold and Silver Complexes with the Monophosphane 1-(Pph2)-2-Me-C2b10h10 and Their Conversion to Gold Micro- and Superstructured Materials},
author = { O. Crespo and C. Diaz and C. O'dwyer and M.C. Gimeno and A. Laguna and I. Ospino and M.L. Valenzuela},
url = {/brokenurl#<Go to ISI>://WOS:000339472000027},
doi = {10.1021/ic5005424},
issn = {0020-1669},
year = {2014},
date = {2014-01-01},
journal = {Inorganic Chemistry},
volume = {53},
number = {14},
pages = {7260-7269},
abstract = {Gold and silver complexes containing the monophosphane 1-PPh2-2-Me-1,2-C2B10H10 with different coordination numbers (2, 3) have been synthesized: [M(7,8-(PPh2)(2)-C2B9H10)(1-PPh2-2-Me-C2B10H10)] (M = Ag, Au) and [Au-2(mu-1,n-C2B10H10)(1-PPh2-2-Me-C2B10H10)(2)] (n = 2, 12). Solid-state pyrolysis of [AuCl(1-PPh2-2-Me-C2B10H10)] and [Au-2(mu-1,12-C2B10H10)(1-PPh2-2-Me-C2B10H10)(2)] in air and of solutions of [AuCl(1-PPh2-2-Me-C2B10H10)] deposited on silicon and silica at 800 degrees C results in single-crystal Au, confirmed by diffraction and SEM-EDS. The morphology of the pyrolytic products depends on the thermolytic conditions, and different novel 3-D superstructures or microcrystals are possible. We also propose a mechanism for the thermal conversion of these precursors to structural crystalline and phase pure materials. The presence of the carborane monophosphane seems to originate quenching of the luminescence at room temperature in the complexes [Au-2(mu-1,n-C2B10H10)(1-PPh2-2-Me-C2B10H10)(2)], in comparison with other [Au-2(mu-1,n-C2B10H10)L-2] species (L = monophosphane).},
keywords = {crystal-structures, derivatives, emitters, excited-state, ligands light-emitting-diodes, nido-carborane-diphosphine, o-carborane, oxidation, transition, triplet},
pubstate = {published},
tppubtype = {article}
}

@article{RN157,
title = {On the Mechanism of Biological Activity of Hydroquinone Derivatives That Inhibit Tumor Cell Respiration. A Theoretical Study},
author = { J. Soto-Delgado and V.E. Bahamonde-Padilla and R. Araya-Maturana and B. Weiss-Lopez},
url = {/brokenurl#<Go to ISI>://WOS:000319102800015},
doi = {10.1016/j.comptc.2013.03.007},
issn = {2210-271x},
year = {2013},
date = {2013-01-01},
journal = {Computational and Theoretical Chemistry},
volume = {1013},
pages = {97-101},
publisher = {2013 Elsevier B.V.},
abstract = {A simple mechanism to understand the biological activity of a series of hydroquinone derivatives is proposed. To validate this proposition Gibbs free energies of formation of the different species involved were calculated. The calculations were performed using density functional theory (DFT) at B3LYP/6-31++G(2df,p) level of theory, including solvation effect. The results show that two important variables to examine are the equilibrium phenol-phenoxide and the solvation energy of neutral species, since the balance between both variables affects the capability of the molecules to cross membranes. Once the molecule crossed the membrane, the formation of radical species shows a qualitative correlation with the magnitude of IC50 values. This provides a reasonable criterion to search for more efficient anticancer drug.},
keywords = {alpha-tocopheryl antioxidant, antitumoral calculation, cancer, cell dft drugs, generation, growth, hydroquinone, in-vivo, mechanism, mitochondria, oxidation, pathways respiration, semiquinone, succinate, targeting tumor},
pubstate = {published},
tppubtype = {article}
}

@article{RN115,
title = {Variations in the Chemical Profile and Biological Activities of Licorice (Glycyrrhiza Glabra L.), as Influenced by Harvest Times},
author = { J. Cheel and L. Tumova and C. Areche and P. Van Antwerpen and J. Neve and K. Zouaoui-Boudjeltia and A.S. Martin and I. Vokral and V. Wsol and J. Neugebauerova},
url = {/brokenurl#<Go to ISI>://WOS:000316339400032},
doi = {10.1007/s11738-012-1174-9},
issn = {0137-5881},
year = {2013},
date = {2013-01-01},
journal = {Acta Physiologiae Plantarum},
volume = {35},
number = {4},
pages = {1337-1349},
abstract = {This study investigates the variations in the chemical profile, free radical scavenging, antioxidant and gastroprotective activities of licorice extracts (LE) from plants harvested during the months of February to November. Correlations between biological properties and the chemical composition of LE were also investigated. The results showed that the total contents of phenols, flavonoids and tannins in LE varied at different harvest times. Liquiritin and glycyrrhizin, the major components of LE, varied in the range of 28.65-62.80 and 41.84-114.33 mg g(-1), respectively. The relative proportion of glycyrrhizin derivative (3), glabridin (4), glabrene (5) and liquiritigenin derivative (6), varied in the range of 0.88-11.38 %, 1.86-10.03 %, 1.80-18.40 % and 5.53-16.31 %, respectively. These fluctuations correlated positively with changes in the antioxidant and free radical scavenging activities of licorice. In general, the samples from May and November showed the most favorable free radical scavenging and antioxidant effects, whereas the best gastroprotective effect was in May. Liquiritin and glycyrrhizin, the major constituents in the February and May LE, appeared to contribute to the superoxide radical scavenging and gastroprotective effects. Glabridin and glabrene, the compounds with the highest relative proportion in the November LE, accounted for the antioxidant and DPPH scavenging activities of licorice. It is concluded that the chemical profile of licorice quantitatively varied at different harvest times and these fluctuations determined changes in its bioactivities. These data could pave the way to optimize harvesting protocols for licorice in relation with its health-promoting properties.},
keywords = {activity, antioxidant constituents, extracts, flavonoids, fruits harvest hplc, ldl licorice, liquid-chromatography, myeloperoxidase, oxidation, performance roots, seasonal-variations, times},
pubstate = {published},
tppubtype = {article}
}