Nuclear magnetic resonance line shapes

JesJ73 Jesson, J. P., Meakin, P. Determination of mechanistic information for nuclear magnetic resonance line shape for intramolecular exchange. Accounts of Chem. Res. 6 (1973) 269-275. 

M. Engelsberg, I.J. Lowe, J.L. Carolan, Nuclear magnetic resonance line shape of linear chain of spins, Phys. Rev. B 7 (1973) 924-929. 

W. H. Jones, Jr., T. P. Graham, and R G. Barnes, "Nuclear magnetic resonance line shapes resulting from the combined effects of nuclear quadrupole and anisotropic shift interactions," Phys. Rev. 132, 1898-1909, (1963). 

Anet FAL, Bourn AJR (1967) Nuclear magnetic resonance line-shape and double-resonance studies of ring inversion in cydohexane-d,j. J. Am. Chem. Soc. 89 760... 

Jameson, C.J. de Dios. A.C. Xe nuclear magnetic resonance line shapes in nanochannels. J. Chem. Phys. 2002. 116. 3805-3821. 

R.. Wittebort, E.T. Olejniczak, R.G. Griffin, Analysis of deuterium nuclear magnetic resonance line shapes in anisotropic media,. Chem. Phys. 86 (1987) 5411-5420. 

Allen, S.G., Mallett, M.J.D., and Strange, J.H. 2001. Morphology of porous media studied by nuclear magnetic resonance line shapes and spin-echo decays. J. Chem. Phys. 114 3258-3264. 

Nuclear magnetic resonance line shape analysis... 

Solid state materials have been studied by nuclear magnetic resonance methods over 30 years. In 1953 Wilson and Pake ) carried out a line shape analysis of a partially crystalline polymer. They noted a spectrum consisting of superimposed broad and narrow lines which they ascribed to rigid crystalline and amorphous material respectively. More recently several books and large articles have reviewed the tremendous developments in this field, particularly including those of McBrierty and Douglas 2) and the Faraday Symposium (1978)3) —on which this introduction is largely based. 

Complex-symmetric matrices might arise in some problems in chemical physics. Examples include the electron paramagnetic resonance (EPR) and nuclear magnetic resonance (NMR) line shape problems.207 Another... 

The substance like 1H, 14N, 19F, 13C, 170,31P contain nuclei with a spin and thus exhibit nuclear magnetic resonance (NMR) like ESR. In NMR also the shapes of line or signal are used for obtaining the information on kinetics of the reaction. 

NUCLEAR MAGNETIC RESONANCE LARMOR PRECESSION LIGAND BINDING ANALYSIS LINE-SHAPE ANALYSIS LOW-BARRIER HYDROGEN BONDS ROLE IN CATALYSIS MAGNESIUM ION (INTRACELLULAR) MAGNETIZATION TRANSFER Nuclear pores,... 

There are many more solvent effects on spectroscopic quantities, that cannot be even briefly discussed here, and more specialized works on solvent effects should be consulted. These solvent effects include effects on the line shape and particularly line width of the nuclear magnetic resonance signals and their spin-spin coupling constants, solvent effects on electron spin resonance (ESR) spectra, on circular dichroism (CD) and optical rotatory dispersion (ORD), on vibrational line shapes in both the infrared and the UV/visible spectral ranges, among others. 

Fig. 14. Plot of line shape change versus rate of exchange of protons between environments A and B. The intensities of the various line functions are not comparable. Reproduced by permission from "High-Resolution Nuclear Magnetic Resonance, by Pople, Schneider, and Bernstein. McGraw-Hill, New York, 1959.

Fig. 1. Error bounds for the nuclear resonance line shape of crystalline CaF2, broadened by a Lorentzian slit function (i.e., the energy absorption by the coupled nuclear spins, due to an exponentially damped harmonic perturbation by a radiofrequency magnetic field).

Exchange Rate Measurements Based on Line-Shape Analysis (DNMR Dynamic Nuclear Magnetic Resonance). Under the measurable exchange rate conditions, two possibilities have been considered ... 

For the investigation of the molecular dynamics in polymers, deuteron solid-state nuclear magnetic resonance (2D-NMR) spectroscopy has been shown to be a powerful method [1]. In the field of viscoelastic polymers, segmental dynamics of poly(urethanes) has been studied intensively by 2D-NMR [78, 79]. In addition to ID NMR spectroscopy, 2D NMR exchange spectroscopy was used to extend the time scale of molecular dynamics up to the order of milliseconds or even seconds. In combination with line-shape simulation, this technique allows one to obtain correlation times and correlation-time distributions of the molecular mobility as well as detailed information about the geometry of the motional process [1]. 

From its very beginning nuclear magnetic resonance (NMR) was used to unravel dynamic processes in amorphous matter, where the high selectivity of this technique was exploited. Recent progress has largely benefited from the development of multidimensional NMR spectroscopy, significantly extending the traditional techniques such as spin-lattice relaxation and line-shape analyses. Modern NMR techniques helped a lot to understand the molecular dynamics in disordered systems such as the a-process. 

Nuclear magnetic resonance spectra can be used to obtain kinetic information in a completely different manner from that mentioned on p. 319. This method, which involves the study of NMR line shapes, depends on the fact that NMR spectra have an inherent time factor If a proton changes its environment less rapidly than 10 times/s, an NMR spectrum shows a separate peak for each position the proton assumes. For example, if the rate of rotation around... 

Nuclear magnetic resonance (NMR) spectra can yield information on magnetic properties, rotational states and of the symmetry of both the molecules and then-environment. Mostly, is used as a probe, but in alkali salts, alkali atoms as Na or Li have also been applied. The effect of molecular dynamics, including pseudorotations, on the NMR line shape is thoroughly discussed in [20,28],... 

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