Search results for " electron paramagnetic resonance spectroscopy"

showing 3 items of 3 documents

Structural analysis of Cu(II) ligation to the 5'-GMP nucleotide by pulse EPR spectroscopy.

2007

JBIC Journal of Biological Inorganic Chemistry, 12 (6)

10120 Department of ChemistryConformational change1303 BiochemistryAnalytical chemistryGuanosine MonophosphateLigandsBiochemistrylaw.inventionInorganic Chemistrycopper; electron-nuclear double resonance; hyperfine sublevel correlation spectroscopy; pulse electron paramagnetic resonance spectroscopy; nucleotidelaw540 ChemistryOrganometallic CompoundsDNA Z-FormElectron paramagnetic resonanceHyperfine structurehyperfine sublevel correlation spectroscopyElectron nuclear double resonanceMolecular StructurePulsed EPRChemistryLigand1604 Inorganic ChemistryElectron Spin Resonance SpectroscopyDNAnucleotideSettore FIS/07 - Fisica Applicata(Beni Culturali Ambientali Biol.e Medicin)CrystallographyUnpaired electronpulse electron paramagnetic resonance spectroscopyNucleic Acid Conformationelectron-nuclear double resonanceTwo-dimensional nuclear magnetic resonance spectroscopyCopperJournal of biological inorganic chemistry : JBIC : a publication of the Society of Biological Inorganic Chemistry
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Properties of HO2• radicals induced by γ-ray irradiation in silica nanoparticles

2014

Abstract We report an experimental investigation on the effects of γ -ray irradiation in several types of silica nanoparticles previously loaded with O 2 molecules. They differ in specific surface and average diameter. By electron paramagnetic resonance (EPR) measurements we observe the generation of about 10 18 HO 2 • /cm 3 interstitial radicals. These radicals are induced by reaction of interstitial O 2 molecules with radiolytic H atoms, as previously suggested for O 2 -loaded bulk a-SiO 2 samples. However, at variance with respect to bulk materials, our experimental evidences suggest a different generation process of HO 2 • radical. In fact, by a detailed study of samples exposed to D 2 …

HO2•; O2; Fumed silica; Electron paramagnetic resonance spectroscopy; Raman spectroscopyChemistryRadicalAnalytical chemistryNanoparticleO2Condensed Matter PhysicsElectronic Optical and Magnetic Materialslaw.inventionParamagnetismsymbols.namesakelawHO2•RadiolysisRaman spectroscopyMaterials ChemistryCeramics and CompositessymbolsMoleculePhysical chemistryFumed silicaIrradiationElectron paramagnetic resonanceRaman spectroscopyElectron paramagnetic resonance spectroscopy
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Methyl Radical in Clathrate Silica Voids. The Peculiar Physisorption Features of the Guest-Host Molecular Dynamics Interaction.

2016

EPR line shape simulations of CH3/SiO2 clathrates and comparison to CH3/N2O and CH3/SiO2 experiments reveal the motional conditions of the CH3 radical up to the unusual regime of its stability, the high-temperature diffusional regime, at 300 K. In the low-temperature region, the CH3 in clathrates is found to rotate around the in-plane axes even at as low temperatures as 3.8 K. However, nonrotating methyls performing only libration about the C2-axes as well as around the C3-axis are also found, proving the existence of special sites in the clathrate voids that begin to accumulate a significant fraction of methyl radicals at temperatures below approximately 7 K. A distinctive feature in the s…

methyl radical CH3 electron paramagnetic resonance spectroscopy EPR clathrate melanophlogiteChemistryRadicalClathrate hydrateMethyl radical02 engineering and technology010402 general chemistry021001 nanoscience & nanotechnology01 natural sciences0104 chemical scienceslaw.inventionchemistry.chemical_compoundPhysisorptionChemical physicsComputational chemistrylawSpectral widthLibrationPhysical and Theoretical Chemistry0210 nano-technologyAnisotropyElectron paramagnetic resonanceThe journal of physical chemistry. A
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