Publicaciones 2011-2020

@article{RN354,
title = {Synthesis of Bifunctional Receptor for Fluoride and Cadmium Based on Calix[4]Arene with Thiourea Moieties},
author = { C. Quiroga-Campano and H. Gomez-Machuca and S. Moris and P. Jara and J.R. De La Fuente and H. Pessoa-Mahana and C. Jullian and C. Saitz-Barria},
url = {/brokenurl#<Go to ISI>://WOS:000401593400017},
doi = {10.1016/j.molstruc.2017.03.089},
issn = {0022-2860},
year = {2017},
date = {2017-01-01},
journal = {Journal of Molecular Structure},
volume = {1141},
pages = {133-141},
publisher = {2017 Elsevier B.V.},
abstract = {A new calix[4]arene thiourea derivative bearing a benzothiazolyl moiety (L) was synthetized and characterized by single crystal X-ray, NMR and ESI-TOF. The binding ability of the bifunctional receptor towards several ions was investigated in acetonitrile by means of UV-Visible and NMR spectroscopy. The UV-Vis studies of receptor L demonstrated a stoichiometry of 1:1 for all ions studied. Also, recognize selectively F- and Cd2+ with a detection limit of 97 and 37 mu M, respectively., Also, H-1 NMR titration of receptor L indicated that both thiourea bridge and phenolic hydroxyl functional groups played a critical role in the binding of F- and Cd2+ ions. H-1 NMR spectrum showed that receptor L has a flattened-cone conformation in solution that changes to a cone conformation in the presence of fluoride while cadmium maintained the initial conformation.},
keywords = {bearing benzothiazole, cadmium, calix[4]arene, chemosensor, complexation, conformation, detection, fluorescent, fluoride, heterocycles, highly ions lower recognition, rim, selective thiourea},
pubstate = {published},
tppubtype = {article}
}

@article{RN315,
title = {Intermolecular Association of Amphipathic Polyelectrolytes in Aqueous Solutions},
author = { H. Rios and M. Urz\'{u}a and V. Villalobos and V. Vargas},
url = {/brokenurl#<Go to ISI>://WOS:000393079900027},
doi = {10.4067/S0717-97072016000400027},
issn = {0717-9707},
year = {2016},
date = {2016-01-01},
journal = {Journal of the Chilean Chemical Society},
volume = {61},
number = {4},
pages = {3287-3290},
abstract = {The intermolecular association of amphipathic polyelectrolytes is studied using fluorescence and conductivity methods. This type of interaction is evidenced by the decrease in the average distances between charges as the polyelectrolyte side chain increases in length. This modify the dissociation degree and consequently, the linear charge density parameter. These distances were calculated with the Manning counterion condensation theory for the conductivity of polyelectrolyte solutions. The determination of the ratio I-1/I-3 of the fluorescence bands of pyrene with polymer content reveals the formation of hydrophobic microdomains at very low concentrations, smaller than the required concentration to produce a significant change in the average distances between charges. These distances and also the I-1/I-3 ratio vary with polymer concentration and their values were dependent on the size of the side chain in the polyelectrolyte. Finally, the experimental behavior of the solution viscosity and electrical conductivity of polyelectrolytes, which increase drastically with dilution, can be explained as a continuous change in the average distances between charges which produce conformational changes.},
keywords = {cations chain-length, charge-density, condensation, conductivity, conductometry, conformation, counterion dqcauchile},
pubstate = {published},
tppubtype = {article}
}

@article{RN212,
title = {A Vibrational Approach for the Study of Historical Weighted and Dyed Silks},
author = { T. Aguayo and M.C. Araya and T.M. Icaza and M. Campos-Vallette},
url = {/brokenurl#<Go to ISI>://WOS:000342254500056},
doi = {10.1016/j.molstruc.2014.07.016},
issn = {0022-2860},
year = {2014},
date = {2014-01-01},
journal = {Journal of Molecular Structure},
volume = {1075},
pages = {471-478},
publisher = {2014 Elsevier B.V.},
abstract = {Samples from six different historic silk objects were studied with the Raman and ATR-IR vibrational techniques. A set of degummed and weighted silks was prepared in order to recognize the vibrational signature associated with the processes used. The spectral information allowed the identification of the weighting process and the dyes used in some of the cases. The different spectra also allowed infer about the deterioration observed in the samples. The silk fibroin displays slight conformational modifications by the weighting process. The degumming process seems to have no chemical effect on the fibroin stability.},
keywords = {atr, bombyx bombyx-mori, conformation, conservation, degradation, deterioration, enhanced infrared-spectroscopy, inks, mori, proteins, raman, raman-scattering, silk, textiles weighted},
pubstate = {published},
tppubtype = {article}
}

@article{carcamo2012raman,
title = {Raman Study of the Shockwave Effect on Collagens},
author = { J.J. Carcamo and A.E. Aliaga and E. Clavijo and M. Branes and M. Campos-Vallette},
url = {/brokenurl#<Go to ISI>://WOS:000300515500052},
doi = {10.1016/j.saa.2011.10.049},
issn = {1386-1425},
year = {2012},
date = {2012-01-01},
journal = {Spectrochimica Acta Part a-Molecular and Biomolecular Spectroscopy},
volume = {86},
pages = {360-365},
publisher = {2011 Elsevier B.V.},
abstract = {The Raman spectra (1800-200 cm(-1)) of isolated dried collagen types land ill were recorded at different times after shockwave (SW) application in aqueous media. SWs were applied in a single session. One week after the SW application the vibrational data analysis indicates changes in the conformation of the collagens; orientational changes are also inferred. During the next three weeks collagens tended to recover the conformation and orientation existing before SW application.},
keywords = {amino-acids, collagens, conformation, dependence, infrared-spectra, raman, scattering, shockwaves, spectroscopy, time tissues},
pubstate = {published},
tppubtype = {article}
}