Browsing by Title Facultad de Ciencias
Now showing items 8073-8092 of 8177
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(2008)The structural elucidation of natural products and complex organic molecules relies heavily on the application of proton detected heteronuclear NMR. Among these techniques, the HMBC NMR experiment remains as the most popular ...
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(Universidad de Chile, 2013)Se desarrolla el estudio de tres teorías inspiradas en la gravedad de Eddington. La teoría Eddington-Born-Infeld (EBI) presenta singularidades en su curvatura cuando se modelan objetos compactos por materia descrita por ...
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(Universidad de Chile, 2022)Con una población global estimada en 2.000 individuos entre Argentina y Chile, menos del 1% de su población histórica, el huemul Hippocamelus bisulcus está categorizado como "En peligro". El objetivo de este estudio fue ...
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(Elsevier, 1999)The IR spectra of the M(mnt)(baba) where M = Ni and Pd, mnt = 1,2-maleonitrile and baba = biacetylbisanyline, were recorded in the high as well in the low energy region. A complete assignment of the observed bands was ...
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(Elsevier Masson SAS, 2018)© 2018 Elsevier Masson SAS Herein, we report the vibrational and optical properties of new Cu2ZnSn1-xGexS2Se2 solid solutions prepared by isomorphic substitution of a fraction of Se by S in Cu2ZnSn1-xGexSe4 (CZTGeSe) through ...
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(2012)Infrared and Raman spectra of O,O-dimethyl S- methylcarbamoylmethylphosphorodithioate, dimethoate, have been recorded. Density functional theory, DFT, with the B3LYP functional was used for the optimization of the ground ...
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(JOHN WILEY & SONS, 2008-09)The 3-methoxy-4-hydroxybenzoic acid or vanillic acid (VA) is a naturally occurring molecule important in winemaking. The spectral fingerprints of VA observed in the infrared and Raman spectra are assigned to fundamental ...
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(Elsevier, 2000)The infrared spectra of the azabipiridyl macrocycle complexes of Ni(II), Cu(II) and Zn(II) were registered between 4000 and 200 cm-1. The spectral assignment allowed to identify the complex formation and structural differences ...
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(Nature, 2015)The absolute configuration of the diterpenoid 9,12-cyclomulin-13-ol (1), a constituent of Azorella and Laretia species, has been established by vibrational circular dichroism spectroscopy in combination with density ...
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(1997)The FT-IR and Raman spectra for the solid naphthalocyanine (H2Nc) and their Co(II), VO2+ and Pb(II) complexes were registered, and a band assignment was proposed. On this basis, the structure of the complexes was inferred: ...
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(2004)The present report on the vibrational spectra of 1-nitropyrene (1-NP) describes the infrared and Raman spectra; their interpretation is aided by local density functional theory (DFT) calculations at the B3LYP/6-311G(d,p) ...
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(1999)The vibrational spectra of three cyclic phosphazene molecules, [N3P3Cl4(O2C12H 8)] (CP1), [N3P3Cl2 (O2C12H8)2] (CP2) and [N3P3(O2C12H8) 3] (CP3), are reported. The far-infrared, infrared and Raman spectra were recorded. ...
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(Elsevier, 1995)The Fourier transform infrared and Raman spectra of the complexes hydrotris(pyrazolyl)borato rhenium tricarbonyl [TpRe(CO)3] and hydrotris(3,5-dimethylpyrazolyl)borato rhenium tricarbonyl [Tp*Re(CO)3] and their ligand salts ...
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(1993)The infrared spectra of seven bis(N-phenyl-substituted hydroxynaphthylaldiminate) complexes of Cu(II) were scanned from 4000 to 100 cm-1. Particular emphasis is given to the low-energy region. The assignment of the chelate ...
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(1992)The results of an investigation of the infrared spectra of mono(diethylenetriamine)copper(II) compounds are reported, with particular reference to the low-energy region. Most assignments are based on the available literature. ...
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(2003)Fourier transform infrared spectroscopy (FTIR), reflection-absorption infrared spectroscopy (RAIRS) and surface-enhanced Raman spectroscopy (SERS) were applied to study the adsorption of the macrocycle sub-2,3-boronnapht ...
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(1992)A comparison of some structural aspects of these complexes with Cp Re(CO)3 are also discussed. Additionally, the preparation and characterization of the trimethyl phosphite derivative is reported. A complete vibrationalassignment ...
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(1992)Infrared spectra of solids Cp*Re(CO)2[PO(OMe)2]X, where Cp* = η5-C5Me5 and X = Cl, Br and I, were recorded. An assignment is offered in which the normal modes are described in terms of "local symmetry". This assignment is ...
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(Elsevier, 2002)The FT-IR and Raman spectra in the solid state, the reflection-absorption IR spectra (RAIRS) and the surface enhanced IR (SEIR) and surface enhanced Raman spectra (SERS) of the Ni(II) (trans-7,14-dimethyl-5,12,-diphenyl- ...
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(Texas State University, 2017)We consider vibrations modeled by the standard linear solid model of viscoelasticity with boundary dissipation. We establish the well-posedness and the exponential stability.