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Showing 1 to 9 of 9 for “"17O-NMR"”.
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Solid-State 17O NMR as a New Probe to Study Acyl-Enzyme Intermediates
This thesis reports on a combined solid-state 17O NMR and quantum mechanical study of three acyl-enzyme intermediates: p-N,N-dimethylaminobenzoyl-chymotrypsin (DAB-CHT), trans¬¬-¬o-methoxycinnamoyl-chymotrypsin (oMC-CHT), and trans-p-methoxycinnamoyl-chymotrypsin (pMC-CHT). At pH 7.8, the three …
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Use Of 17o-Nmr Spectroscopy To Study The Coordination Chemistry Of Trivalent Lanthanide Ions In Solution
… solvent molecules coordinated to Dy3+ ions using 17O-NMR spectroscopy in acetone, ethyl acetate, tetrahydrofuran, dimethylsulfonate, dimethylformaldehyde, di-isopropyl ketone, hexamethyl acetone and 4-chlorobenzaldehyde. These solvents were selected because they contain a range of functional …
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ΜΕΛΕΤΗ ΤΗΣ ΔΙΑΜΟΡΦΩΣΗΣ ΚΑΙ ΤΗΣ ΜΟΡΙΑΚΗΣ ΔΥΝΑΜΙΚΗΣ ΤΩΝ ΕΓΚΕΦΑΛΙΝΩΝ ΜΕ ΦΑΣΜΑΤΟΣΚΟΠΙΑ ΠΥΡΗΝΙΚΟΥ ΜΑΓΝΗΤΙΚΟΥ ΣΥΝΤΟΝΙΣΜΟΥ (17Ο-NMR) ΚΑΙ ΥΠΕΡΥΘΡΟΥ...
IN THIS STUDY THE RESULTS OF 17O-NMR STUDIES OF LEU-ENKEPHALIN SELECTIVELY ENRICHED IN 17O IN POSITIONS GLY-2, GLY-3 AND THE TERMINAL CARBOXYL GROUP ARE REPORTED. FROM STUDIES IN AQUEOUS SOLUTIONS AND IN CH3CH/DMSO (4:1) MIXTURES, IN SEVERAL PH AND TEMPERATURE VALUES IT IS CONCLUDED THAT BOTH …
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Structural studies on Functional Materials using Solid-State NMR, Powder X-ray Diffraction and DFT Calculations
… materials. One and two dimensional 31P and 17O solid state NMR experiments highlight subtle thermally induced structural changes in (MoO2)2P2O7 pyrophosphate, tungsten trioxide WO3 and negative thermal expansion ZrW2O8. DFT methods using CASTEP software to calculate 31P and 17O NMR …
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Nuclear magnetic resonance study of the bonding of carbon monoxide to palladium and platinum surfaces
The 13c and 17o NMR of CO chemisorbed on small particles of Pd and Pt has been observed. The 17o resonance represents the first reported NMR observation of a spin larger than 1/2 adsorbed on a metal surface. At low temperatures, the 13c resonance of CO on Pd is centered at 540 ppm down field from …
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Alteration mechanisms of spent nuclear fuel and characterization of potential uranium secondary phases.
… Raman spectroscopy with a chapter dedicated on 17O NMR. For the latter, given the long alteration timeline for uranium dioxide, it is challenging to achieve sufficient alteration products for analysis within a short 4-year PhD program. Some known uranium compounds were synthesized and enriched …
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Solid-State NMR of Metallic and Paramagnetic Systems
Solid-state nuclear magnetic resonance (ssNMR) is a powerful element-specific technique to study local atomic environments in many different classes of materials; however, ssNMRbased methodologies have primarily focussed on diamagnetic systems without any unpaired electrons. In paramagnetic or …
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Local Structures of Niobium-Containing Cation-Disordered Rocksalt Materials: Cobalt-Free Cathodes for Lithium-Ion Batteries
… due to O-to-Ni charge transfer on charge. 17O NMR spectra of pristine and delithiated LNbNO are examined for signatures of O redox, however the spectra are complicated by the incomplete oxidation of Ni to Ni4+, meaning any possible O redox signal is obscured by unpaired spin density from Ni.
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New adaptations of analytical tools for the study of dynamic interactions of lanthanide-based catalysis in aqueous media
… described in this thesis involves the use of 17O NMR spectroscopy with variable temperature for the determination of important exchange rates in lanthanide-catalyzed reactions. The results described in this thesis demonstrate the utility of these two powerful analytical tools to study aqueous, …