Browsing by Author "Campos Vallette, Marcelo"
Now showing items 1-20 of 43
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Venegas Yazigi, Diego; Campos Vallette, Marcelo; Lever, A. B.P.; Costamagna, J.; Latorre, Ramón; Hernández G., W. (2003)It has been shown that innocent ligands always contribute with a similar electron density to a metal centre in a complex regardless of which other innocent ligands are bonded to the same centre, while non-innocent ligands ...
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Celis, Freddy; García, Macarena; Díaz Fleming, Guillermo; Campos Vallette, Marcelo (Sociedad Chilena de Quimica, 2017)The development of new biomaterials has gained increasing attention in the last decade. One of the most important aspects in the development of these new materials is to understand the chemical cues presents in the native ...
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Costamagna, J.; Ferraudi, G.; Matsuhiro, B.; Campos Vallette, Marcelo; Canales, J.; Villagrán, M.; Vargas, J.; Aguirre, M. J. (Elsevier, 2000)Recent literature results on inorganic models related to metalloenzymes which transport electrons or activate small molecules are discussed in this review. The molecular systems are essentially restricted to macrocyclic ...
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García Ramos, J. V.; Sánchez-Cortés, S.; Leyton, P.; Campos Vallette, Marcelo (2007)Polycyclic Aromatic Hydrocarbons (PAHs) were detected at trace concentrations. In order to accomplish that, new SERS substrates were developed based on silver nanoparticles, both in suspension and immobilized in glass. ...
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Meneses Franco, Ariel; Campos Vallette, Marcelo; Vásquez Arancibia, Sergio; Soto Bustamante, Eduardo (MDPI AG, 2018)Photoluminescent mechanisms in erbium-doped barium titanate nanoparticle systems were studied. Er3+ ions were introduced into the BaTiO3 lattice by the sol-gel method. The resulting Er3+ concentration was between 0% and ...
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Aliaga, A. E.; Leyton, P.; Clavijo Campos, Ernesto; Campos Vallette, Marcelo (Taylor and Francis Inc., 2016)© 2016, Copyright © Taylor & Francis Group, LLC. The natural dyes lawsone and plumbagin (1,4-naphthoquinones) were studied by using fluorescence, Raman, infrared (IR), surface-enhanced Raman scattering (SERS), and ...
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Guerrini, L.; Jurasekova, Z.; Domingo, C.; Pérez-Méndez, M.; Leyton, P.; Campos Vallette, Marcelo; Garcia-Ramos, J. V.; Sanchez-Cortes, S. (2007)The interaction between adsorbates of different nature and plasmonic nanoparticles is reviewed here on the basis of the work done in our laboratory in the past few years. The paper is structured for analyzing the interaction ...
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Campos Vallette, Marcelo; Toro Labbé, Alejandro; Contreras Ramos, Renato; Díaz, F. (1986)By means of an iterative consistency method it has been determined a complete potential field for the urea molecule. The force constants set which interpretates well the vibrational spectra of urea and its deutero derivatives ...
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Saavedra S., M.; Mendizábal Emaldía, Fernando; Campos Vallette, Marcelo; Clavijo Campos, Ernesto; Díaz Fleming, Guillermo (1998)The infrared spectra of naphthalocyanine (H2Nc) and its copper(II) complex (CuNc) were registered in the region 4000-450 cm-1. These compounds were deposited onto a smooth copper surface and their specular infrared spectra ...
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Cárdenas Jirón, G. I.; Figueroa, K. A.; Vargas C., V.; Gómez Jeria, Juan; Campos Vallette, Marcelo (Marcel Dekker. Inc., 1987-04-11)Thymine dimers were obtained under ultraviolet irradiation. The major product is a trans-anti dimer linked by a cyclobutane ring. The infrared assignments and the mechanism of formation of this dimer are discussed in ...
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Campos Vallette, Marcelo; Clavijo Campos, Ernesto; Mendizábal Emaldía, Fernando; Zamudio, W.; Baraona, Ruth; Díaz Fleming, Guillermo (Elsevier, 1996)FT-IR spectra of the title compounds and derivatives were measured in the range 4000-120 cm-1. A complete experimental spectral assignment has been performed. A simplified normal coordinate treatment orientates some ...
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Campos Vallette, Marcelo; Clavijo Campos, Ernesto; Gómez Jeria, Juan; Díaz Fleming, Guillermo (Editorial Codelia, Publicaciones Científicas, 1984-11-24)On the basis of CNDO and INDO ca1culations, the trans and gauche isomers of the free radical n-perfluorobuthyl are established as the most probable structures in the conformational equilibrium. Spectral differences in ...
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Campos Vallette, Marcelo; Clavijo Campos, Ernesto (1985)By means of the force field and mean amplitudes of vibration of furan, thiophene, selenophene and tellurophene molecules, we have concluded that the ground-state aromaticity order in the series is thiophene > tellurophene ...
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Campos Vallette, Marcelo; Figueroa, K. A. (1988)By means of an ab initio force field and the mean amplitudes of vibration of the cyclic oxocarbon dianions Cn0nwith n= 3, 4 and 5, it has been found that the ground-state aromaticity order in the series is: deltate (n=3) ...
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Campos Vallette, Marcelo; Figueroa, K. A.; Latorre, R.; Manriquez, V.; Díaz Fleming, Guillermo; Costamagna, J.; Otero, M. (1992)The crystal and molecular structure of bis-(N-phenyl-1-hydroxy-2-naphthylaldiminate) nickel(II) (1) have been determined by x-ray crystallography. The compound crystallizes in the triclinic space group P1, No. 2 with one ...
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Muñoz Pérez, J.; Leyton, P.; Paipa, C.; Soto, J. P.; Brunet, J.; Gómez Jeria, Juan; Campos Vallette, Marcelo (Pergamon-Elsevier, 2016)Accurate characterization of two phase bubbly flows is crucial in many industrial processes such as fluidized reactors, ore froth flotation, etc. The bubble size determines the rate at which components present in the gas ...
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Celis, Freddy; Campos Vallette, Marcelo; Vega, José Cárcamo; Gómez Jeria, Juan; Aliaga, Carolina (Sociedad Chilena de Quimica, 2015)The sensor 1-(4-mercaptophenyl)-2,4,6-triphenylpyridinium perchlorate compound was vibrationally characterized using Raman and the Surface-Enhanced Raman techniques, SERS and Shell-Isolated Nanoparticles-Enhanced Raman ...
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Araya, C.; Jaque, J.; Naranjo, N.; Icaza, M.; Clavijo Campos, Ernesto; Aguayo, T.; Campos Vallette, Marcelo (2014)A material characterization of two artworks discovered in the San Francisco Church, Santiago, Chile, was performed using micro-Raman spectroscopy. Structural painted beams and a wall painting that belong to the same time ...
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Sepúlveda, M.; Gutierrez, S.; Campos Vallette, Marcelo; Clavijo Campos, Ernesto; Walter, P.; Cárcamo, J. J. (Sociedad Chilena de Quimica, 2013)Yellow blocks from the archaeological site Playa Miller 7 (PLM7), on the coast of Atacama Desert in northern Chile, were analyzed by Raman spectroscopy and X-ray fluorescence (XRF) portable. Our results identify for the ...
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Aguayo, T.; Clavijo Campos, Ernesto; Eisner, F.; Ossa Izquierdo, Carolina; Campos Vallette, Marcelo (2011)Pigments and fresco-related materials from the wall painting Historia de Concepción by Gregorio De La Fuente in Concepción, Chile were identified by Raman microscopy. The pigments were compared with those obtained from the ...