Nuclear magnetic resonance of protons

Nuclear magnetic resonance of protons was first detected in 1946 by Edward Purcell (Harvard) and by Felix Bloch (Stanford) Purcell and Bloch shared the 1952 Nobel Prize in physics... 

The determination of the profile of the phenolic fraction was performed for the first time by Bianco et al. [7] by nuclear magnetic resonance of proton, on different olive cultivar samples, appropriately selected. Obviously, the proposed NMR determination of the phenolic profile is not an alternative to HPLC procedures, but constitutes a rapid, alternative methodology to examine the phenolic contents in relation to the main components. In fact, the sensibility of NMR technique does not evidence components that are present in quantities less than 5% of the total. 

Dupuis, J., Battut, J. P., Fawal, Z., Hajjimohamad, H., de Roy, A., and Besse, J. P. 1990. Nuclear magnetic resonance of protons in the hydrotalcite type compound Zn2y3Alj (0H)2Clj. n(H20). Solid State Ionics 42 251-55. 

A -substituents. properties, 33 Nuclear magnetic resonance, of 13 C. in polymethine dyes, 72 of proton, in polymethine dyes. 72... 

This is based on spatial nuclear magnetic resonance of water protons within the body. For a contrast agent to be effective, direct coordination of water molecules to the lanthanide is necessary to impart efficient relaxation of the water protons. Therefore, whilst this has been covered comprehensively in a number of recent reviews... 

Wilson, M. A., and Goh, K. M. (1977). Proton-decoupled pulse Fourier-transform 13C nuclear magnetic resonance of soil organic matter. J. Soil Sci. 28, 645-652. 

Agris, P.F. Campbell, I.D. (1982). Proton nuclear magnetic resonance of intact friend leukemia cells Phosphorylcholine increase during differentiation. Science 216,1325-1327. 

The synthesis of the complex is followed by the most important step of characterization of the complex. The composition and the structural features of both the ligand and complex have to be established before embarking on further studies. There exist many methods by which the composition and structural features of the complexes are studied. Some of the methods are (i) elemental analysis, (ii) X-ray crystallography, (iii) UV-Vis absorption spectra, (iv) infrared spectroscopy, (v) Raman spectroscopy, (vi) thermal methods of analysis such as thermogravimetry, differential thermal analysis, (vii) nuclear magnetic resonance spectroscopy (proton, multinuclear), (viii) electrospray mass spectrometry. Depending upon the complexity of the system, some or all the methods are used in the studies of complexes. 

Altman, L. J., Lauggani, D., Gunnarsson, G., and Wennerstrom, H., Proton, deuterium, and tritium nuclear magnetic resonance of intramolecular hydrogen bonds. Isotope effects and the shape of the potential energy function, J. Am. Chem. Soc. 100, 8264-8266 (1978). 

L. Poppe and H. van Halbeek, Nuclear magnetic resonance of hydroxyl and amido protons of oligosaccharides in aqueous solution. Evidence for a strong intramolecular hydrogen bond in sialic acid residues, J. Am. Chem. Soc., 113 (1991) 363-365. 

One of the most powerful tools available to us for characterization of these fractions is nuclear magnetic resonance spectroscopy. Proton and 13C Fourier transform nmr spectra were run in deuterochloroform on these same asphaltene and maltene samples and some of the spectra are shown in Figures 7 and 8. One of the first interesting points we find is that the asphal-... 

The study of humic substances by nuclear magnetic resonance of the isotope and the proton suggests that aliphatic structures prevail over aromatic structures for the fulvic acids extracted from marine water, contrary to the case for soil fulvic acids. The high values of the H C ratio in marine fulvic acids also point to an aliphatic nature (Stuermer and Payne, 1976). 

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