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Showing 1 to 17 of 17 for “"Carbon-13 NMR"”.
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Experimental and computational techniques in carbon-13 NMR
An efficient method for calculating NMR lineshapes from anisotropic second rank tensor interactions is presented. The algorithm produces lineshapes from asymmetric tensors by summing those from symmetric tensors. This approach significantly reduces the calculation time, greatly facilitating …
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The analysis of rocket propellants by carbon-13 NMR
… molecular weight of 3000, were analyzed with carbon-13 NMR. The relative abundance of the three types of structural units (cis-1,4, trans-1,4, and vinylic-1,2 units) was quantitatively determined. The distribution of the three structural units was found to be completely random. Branching in …
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Carbon-13 NMR Relaxation Study of Motional Dynamics in Complex Liquids
… compounds has been investigated using $\sp{13}$C NMR relaxation measurements. Natural abundance $\sp{13}$C NMR spin-lattice relaxation times (T$\sb1),$ spin-spin relaxation times (T$\sb2),$ and nuclear Overhauser effects of individual carbon nuclei in the complex phthalate liquids were …
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High pressure carbon-13 NMR studies of dynamics in disordered systems
… pressure high resolution $\sp1$H-decoupled $\sp{13}$C NMR spectroscopy is described. The design of an pulsed NMR spectrometer with increased sensitivity and versatility is presented and used in the design and development of a high pressure high resolution double-resonance NMR probe. This new …
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XPS and Carbon-13 NMR spectroscopic analysis of composite rocket propellants
In this study the applicability of Carbon-13 NMR and XPS to the detection of chemical changes in a solid composite rocket propellant was studied. Storage at elevated temperatures was used to simulate the propellant ageing process. In the XPS analysis, changes in the sources for the N(1s) and Cl(2p) …
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Prediction of proton and carbon-13 NMR chemical shifts using chemical shift prediction programs
… and interpreted using two-dimensional NMR techniques. ACD-V 4 and CHARGE-V7 programs were used to predict 1H chemical shifts for these compounds. 1H and 13C_spectra for alkaloids were also collected using a Varian spectrometer and also interpreted with the use of multi-pulse techniques. …
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Proton and Carbon-13 Nmr Studies of Enantiomeric Solutes in the Presence of Chiral Solvating Agents
Made available in DSpace on 2014-12-13T20:09:38Z (GMT). No. of bitstreams: 1 7606800.pdf: 4182323 bytes, checksum: f146483ce5a63112dda0db5844fa9845 (MD5) Previous issue date: 1975
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Applications of high resolution solid state carbon-13 NMR to the study of multicomponent polymer systems
The technique of high resolution solid state carbon-13 NMR, achieved with magic angle spinning (MAS) and high power 13c-1H dipolar decoupling and cross polarization, was applied to a number of multicomponent polymer systems. Specific problems which were addressed are: (1) the nature of domain …
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The analytical chemistry of agricultural guanidine fungicides
… by spectroscopic methods such as carbon-13 NMR, MS. and FAB/MS. The synthetic routes have been described and different routes for the preparation of guazatine were also established.
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Multinuclear Nuclear Magnetic Resonance Studies of Model Inorganic Systems (Nmr)
… employed to obtain information from molybdenum carbonyl on (gamma)-aluminum, the Group IIIA compounds, Al III and silica hydrolysis. Techniques such as rapid magic-angle sample spinning (MASS) of glass sealed samples are used to investigate the highly air sensitive system molybdenum carbonyl on …
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Palladium and platinum complexes of vitamin Bâ
… and cis PdC12 (PL)2 were also studied by use of carbon-13 nmr spectroscopy. All the complexes have also been characterised by use of infrared spectral studies. In the complexes, PtCI2PM.H20 and PdC12PM, the ligand pyridoxamine is chela ted to the metal through the aminomethyl nitrogen and the …
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The synthesis of a ferromagnetic polymer
… on the terminal alkyne have been studied by carbon-13 NMR. There was no correlation however, between the chemical shift of terminal alkyne and the polymerisability of the monomer.
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Some aspects of the interaction of humic substances with metal ions
… their complexes with heavy metals. Proton and carbon-13 NMR provides some structural and functionality information; Paramagnetic lanthanide ions affect these spectra. Some heavy metals are studied as NMR nuclei, but measurements are restricted by their sensitivity. A humic acid is fractionated …
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Interrogating and potentiating energy metabolism in the human brain after traumatic brain injury
… in my thesis I used microdialysis to deliver carbon-13 labelled substrates to the human brain. I combined this with nuclear magnetic resonance (NMR) spectroscopy of interstitial fluid sampled from the brain to interrogate glucose, lactate and tricarboxylic acid (TCA) cycle metabolism. Study I: …
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Controlled polymerization of alkyl vinyl ethers via 'covalent' propagating species
… them by using UV/visible spectroscopy and carbon-13 NMR spectroscopy. In both schemes a reversible interaction between a monomer and an iodine molecule is postulated as a necessary elemental reaction to fit the observed expression for the rate of polymerization. From spectroscopic analysis …
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SYNTHESIS, BIOLOGICAL ACTIVITY AND CONFORMATIONAL ANALYSIS OF FRAGMENT ANALOGUES OF ALPHA-MELANOTROPIN (PEPTIDE, STRUCTURE-FUNCTION, PHENYLGLYCINE, NMR, TETRAHYDROISOQUINOLINE-3-CARBOXYLATE).
… conformational analysis by both proton and carbon-13 NMR was performed. The conformational preferences of the backbone were examined by analyzing: (1) the alpha proton chemical shifts; (2) the amide proton chemical shifts; (3) the amide proton coupling constants; and (4) the amide proton …
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Non-stoichiometry and radiation damage effects in zirconium carbide and layered carbide ceramics for nuclear fuel cladding applications
… whose properties can be optimised by varying the carbon content. Whilst the majority of studies have focused on producing and measuring different properties of ZrC, very few studies have focused on accurately measuring the carbon content for a specified fabrication route resulting in a scatter in …