Publicaciones 2011-2020

@article{RN420,
title = {Activation of Electrophile/Nucleophile Pair by a Nucleophilic and Electrophilic Solvation in a Snar Reaction},
author = { B. Sanchez and C. Calderon and R.A. Tapia and R. Contreras and P.R. Campodonico},
url = {/brokenurl#<Go to ISI>://WOS:000447985400001},
doi = {10.3389/fchem.2018.00509},
issn = {2296-2646},
year = {2018},
date = {2018-01-01},
journal = {Frontiers in Chemistry},
volume = {6},
abstract = {Nucleophilic aromatic substitution reactions of 4-chloroquinazoline toward aniline and hydrazine were used as a model system to experimentally show that a substrate bearing heteroatoms on the aromatic ring as substituent is able to establish intramolecular hydrogen bond which may be activated by the reaction media and/or the nature of the nucleophile.},
keywords = {anion aromatic-substitution catalysis, effect, effects, electronic ionic liquids, mixtures, organic-reactions, potentials preferential reactions, secondary-amines, solvation, solvent solvent, temperature theory},
pubstate = {published},
tppubtype = {article}
}

@article{RN410,
title = {Exploring the Influence of Diels-Alder Linker Length on Photothermal Molecule Release from Gold Nanorods},
author = { C. Vetterlein and R. Vasquez and K. Bolanos and G.A. Acosta and F. Guzman and F. Albericio and F. Celis and M. Campos-Vallette and M.J. Kogan and E. Araya},
url = {/brokenurl#<Go to ISI>://WOS:000432505900038},
doi = {10.1016/j.colsurfb.2018.03.021},
issn = {0927-7765},
year = {2018},
date = {2018-01-01},
journal = {Colloids and Surfaces B-Biointerfaces},
volume = {166},
pages = {323-329},
publisher = {2018 Elsevier B.V.},
abstract = {We studied the photothermal release of carboxyfluorescein (CF) linked to the gold surface of gold nanorods (GNRs) by two Diels-Alder adducts of different lengths (n = 4 and n = 9). The functionalized GNRs were irradiated with infrared light to produce photothermal release of CF by a retro-Diels-Alder reaction. The adducts were chemisorbed on the GNRs and the functionalized nanoparticles were characterized by UV-vis, DLS, zeta potential and Raman and surface-enhanced Raman spectroscopy (SEAS). On the basis of the degree of nanoparticle functionalization and the SERS results, we inferred the orientation of CF on the surface of the gold nanoparticle. Moreover, we determined the photothermal release profiles of CF from the gold surface by laser irradiation. The release was faster for the longer linker (n = 9). SERS revealed that, for the shorter linker (n = 4), molecules are oriented perpendicularly with respect to the gold surface, thereby maintaining the CF far from the surface. In contrast, the longer linker was observed to be tilted, thus maintaining CF close to the gold surface and therefore potentially favoring the photothermal transfer of energy. These results are relevant for the future development of the spatial and temporal controlled release of drugs by means of gold nanoparticles.},
keywords = {controlled drug-delivery, effect, enhanced fluorescence, micelles, nanoparticles, peptide photothermal polymeric raman-scattering, release, spatial temporal},
pubstate = {published},
tppubtype = {article}
}

@article{RN249,
title = {Gold Nanoparticles Interacting with Beta-Cyclodextrin-Phenylethylamine Inclusion Complex: A Ternary System for Photothermal Drug Release},
author = { R. Sierpe and E. Lang and P. Jara and A.R. Guerrero and B. Chornik and M.J. Kogan and N. Yutronic},
url = {/brokenurl#<Go to ISI>://WOS:000358558300010},
doi = {10.1021/acsami.5b00186},
issn = {1944-8244},
year = {2015},
date = {2015-01-01},
journal = {Acs Applied Materials & Interfaces},
volume = {7},
number = {28},
pages = {15177-15188},
abstract = {We report the synthesis of a 1:1 beta-cydodextrin-phenylethylamine (beta CD-PhEA) inclusion complex (IC) and the adhesion of gold nanoparticles (AuNPs) onto micro crystals of this complex, which forms a ternary system. The formation of the IC was confirmed by powder X-ray diffraction and NMR analyses (H-1 and ROESY). The stability constant of the IC (760 M-1) was determined using the phase solubility method. The adhesion of AuNPs was obtained using the magnetron sputtering technique, and the presence of AuNPs was confirmed using UV-vis spectroscopy (surface plasmon resonance effect), which showed. an absorbance at 533 nm. The powder X-ray diffractograms of beta CD-PhEA were similar to those of the crystals decorated with AuNPs. A comparison of the one- and two-dimensional NMR spectra of the IC with and without AuNPs suggests partial displacement of the guest to the outside of the beta CD due to attraction toward AuNPs, a characteristic tropism effect. The size, morphology, and distribution of the AuNPs were analyzed using TEM and SEM. The average size of the AuNPs was 14 nm. Changes in the IR and Raman spectra were attributed to the formation of the complex and to the specific interactions of this group with the AuNPs. Laser irradiation assays show that the ternary system beta CD-PhEA-AuNPs in solution enables the release of the guest.},
keywords = {applications, beta-cyclodextrin, biomedical brain complex, delivery, effect, enhanced gold inclusion laser-ablation, magnetron nanoparticles, permeability, phenylethylamine, photothermal plasmon resonance, retention, silver size, sputtering, surface},
pubstate = {published},
tppubtype = {article}
}

@article{RN35d,
title = {Ozone Weekend Effect in Santiago, Chile},
author = { R.J. Seguel and R.G.E. Morales and M.A. Leiva},
url = {/brokenurl#<Go to ISI>://WOS:000301087800009},
doi = {10.1016/j.envpol.2011.10.019},
issn = {0269-7491},
year = {2012},
date = {2012-01-01},
journal = {Environmental Pollution},
volume = {162},
pages = {72-79},
publisher = {2011 Elsevier Ltd.},
abstract = {The study examined weekday-weekend differences in ozone, NOx (NO and NO2) and VOC concentrations in Santiago, Chile, from 1999 to 2007. The results provide evidence for the occurrence of an atmospheric phenomenon that produces higher ozone concentrations during weekends despite lower concentrations of ozone precursors. This phenomenon is known as the weekend effect (WE)., The overall ozone decrease since the spring of 2004 was a consequence of the implementation of several urban pollution control measures. Although these measures caused a decline in the number of days that exceed the national standard from two-thirds to one-third of summer days, the WE, which became statistically significant beginning in September 2004, could not be eliminated. Furthermore. VOC/NOx ratios decreased during the same period (2004), especially in the most industrialized area of Santiago. Similarly, under these regimes, the VOC/NOx ratios were higher on Sundays than on weekdays and caused higher ozone concentrations on Sundays.},
keywords = {effect, environmental chemistry, focus, nox ozone, phoenix, photochemistry, ratio, surface voc/nox weekday, weekend},
pubstate = {published},
tppubtype = {article}
}