5 edition of Pulsed NMR Study of Molecular Motion in Solids found in the catalog.
Pulsed NMR Study of Molecular Motion in Solids
G. B. Manelis
January 31, 1989
Written in English
|Series||Soviet Scientific Reviews Series, Section B|
|The Physical Object|
|Number of Pages||83|
1 Feature article for Macromol. Rapid. Comm. Selective NMR Pulse Sequences for the Study of Solid Hydrogen-containing Fluoropolymers† Shinji ANDO 1, Robin K. HARRIS2*, Paul HAZENDONK3 & Philip WORMARD4 1Department of Organic and Polymeric Materials, Tokyo Institute of Technology, Ookayama, Meguro-ku, Tokyo , Japan. The alignment of pyrene in a 1-palmitoyloleoyl-phosphatidylcholine bilayer was investigated using two different approaches, namely solid-state 2 H-NMR spectroscopy and molecular dynamics (MD) simulations. Quadrupolar splittings from 2 H-NMR spectra of deuterated pyrene-d 10 in an oriented lipid bilayer give information about the orientation of C-D bonds with respect to the membrane normal.
One of the main applications of solid-state NMR is to study the structure and dynamics of biopolymers, such as membrane proteins, under physiological conditions where the polypeptides undergo global motions as they do in biological membranes. The effects of NMR radiofrequency irradiations on nuclear spins are strongly influenced by these motions. Deuterium Solid State NMR Study of Molecular Mobility and Catalytic Dehydration of tert.-Butyl Alcohol on H-ZSM-5 Zeolite. ,,, DOI: /S(08) David A. Johnson, do Valenzuela, Raphael Zidovetzki.
Solid-State NMR Studies of Biomolecular Motion: Theory, Analysis, Pulse Sequences, and Phase Cycling 4th Winter School on Biomolecular Solid-State NMR, Stowe, VT, Jan. , Mei Hong Department of Chemistry, MIT. Molecular Motion is Abundant in Biomolecules & is Important for Function • Ligand binding. The influence of fast molecular motions on NMR parameters in molecular organic solids is explored on a set of amino acids and nucleic acid bases. A combination of DFT molecular dynamics and calculations of shielding and electric field gradient (EFG) tensors reveals the impact of vibrational motions on isotropic chemical shifts, chemical shift anisotropies (CSAs) and quadrupolar interactions.
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JOURNAL OF MAGNETIC RESONANCE Z () A Pulsed NMR Study of Molecular Motion in Solid N-Methyl-5,6 dihydro-7H,12H-dibenz(c, f ]azocine DAVID W.
LARSEN AND TED A. Pulsed NMR Study of Molecular Motion in Solids book Department of Chemistry, University of Missouri-St. Louis, Natural Bridge Road, St. Louis, Missouri Received Febru ; revision received l-5,6 Author: David W Larsen, Ted A Smentkowski.
A pulsed NMR study of relaxation times, T 1 and T 1D, and second moments for solid 5,5-dimethyl-5,6,11,tetrahydro-5 H -dibenzo[ b,f ]silocin is reported. The compound was studied over the temperature range − to 50° by: 1. Introduction We have previously reported the results of pulsed NMR studies of molecular motion in tricyclic compounds with central eight-membered rings in the solid phase.
The compounds studied were 6,12,trimethyl-5,6-dihydro-7H,12H- dibenzo [c,fJ [1,5]silazocine and N-methyl-5,6-dihydro-7H, 12H-dibenz [c,fl- by: 1.
Solid-state NMR (ssNMR) spectroscopy is a special type of nuclear magnetic resonance (NMR) spectroscopy, characterized by the presence of anisotropic (directionally dependent) interactions. Compared to the more common solution NMR spectroscopy, ssNMR usually requires additional hardware for high-power radio-frequency irradiation and magic-angle spinning.
Rotor synchronized three‐dimensional 13 C magic angle spinning nuclear magnetic resonance: Correlation between molecular structure, order, and dynamics in solids. The Journal of Chemical Physics93 (11), Cited by: NMR spectroscopy. Solid state 13 C CP/MAS NMR spectra were recorded with a Bruker AC spectrometer operating at MHz and K.
The following conditions were applied: repetition time 4 s, 1 H 90° pulse length μs, contact time 1 ms and spin rate Hz. The compounds were placed in a zirconium rotor, 7 mm in diameter and Solid state nuclear magnetic resonance (NMR) off-resonance measurements provide valuable information about molecular dynamics in a heteronuclear system [7–10].
So far only a few authors have presented the results of study of the cross-relaxation in the heteronuclear systems in the solid state [7, 10–12].
NMR Spectroscopy for Solids A rapidly growing body of techniques to study solid materials using nuclear magnetic resonance (NMR) spectroscopy is providing unique views into the structure, kinetics, and dynamics of inorganic and biological molecules.
The powder aver- age of the second moment of the intramolecular spec- The work reported here is part of a research pro- trum of SiH4 in the spin isomeric limit, is then calcu- ject on the study of molecular solids by NMR and lated to be G2, about one third of the rigid lat- neutron diffraction which is financed by the Belgian tice value.
Solid-state nuclear magnetic resonance (NMR) has long emerged as a valuable technique for characterizing the molecular structure, conformation, and dynamics of polymer chains in various polymer systems. The principles of the solid-state 13C NMR cross-polarization experiment are described along with corresponding relaxation measurements.
The ensuing recent applications of these. The regular and generally used NMR procedures were summarized e.g., by Dyson and Wright, with particular focus on intrinsically disordered proteins, 4 by Duer in the case of studying molecular.
We investigate the effect of high pressure on the molecular order and the dynamics of solid (crystalline and amorphous) systems of simple synthetic polymers. Pulsed deuteron-NMR techniques 1,2 are used to study the effect of high hydrostatic pressure on the dynamical properties of polystyrene (PS), polycarbonate (PC) and polyethene (PE).
Magic-angle spinning with recoupling pulse sequences, Variable angle spinning experiments, Magic-angle turning, Two-dimensional separation of spinning sideband patterns, References, PART II: APLICATIONS OF SOLID-STATE NMR, 6 NMR Techniques for Studying Molecular Motion in Solids, Melinda J.
Duer. Solid-state nuclear magnetic resonance (NMR) is an extremely useful analytical method to obtain information about chemical behaviors and molecular dynamics. The molecular dynamics of amorphous and crystalline PHB were analyzed with 13 C magic-angle spinning (MAS) NMR and 13 C spin-lattice relaxation times (T 1 C) [ 16 ].
High resolution magic angle spinning (HRMAS) 1H NMR in combination with 2D exchange NOESY and pulsed field gradient (PFG) NMR diffusion experiments have been used to characterize 1 N methanol swollen polymer anion exchange membranes (AEM) presently being developed for alkaline fuel cells.
Standard static 1H NMR experiments on these materials have proven unsuccessful due to severe. Molecular motion in the order of 10 3 and 10 8 Hz can be analyzed by a line shape and line width of a 2 H NMR Quadrupolar Carr-Purcell-Meiboom-Gill (QCPMG) spectrum. The analysis of molecular motion in paramagnetic materials is possible by simulation of the 2 H NMR spectrum, including paramagnetic effects.
13 C Single-pulse excitation 13 C experiments were run using a 90° pulse of µs. Quantitative solid-state 1 H single-pulse excitation MAS NMR. A new solid-state NMR experiment, J-WISE, is presented for studying local mobility in solids with atomic resolution.
The experiment correlates the wide-line proton spectrum with the isotropic chemical shift of carbon via the J coupling between both nuclei. The wide-line proton dimension contains information about the relative mobility of the directly bonded protons.
The through-bond. Pulsed field gradient (PFG) NMR is a powerful tool to examine diffusion of adsorbates in porous systems. The use of mesoporous silicas with uniform particle sizes allowed us to demonstrate the. The nuclear magnetic resonance (NMR) spectroscopy is a very powerful tool in the chemical characterization, both in solution and in solid state.
With the development of NMR spectrometers more potent field, employing radio frequency pulse, provided the development of studies on materials, especially amorphous materials. Thus, there was a need to develop techniques to obtain spectra in solid.
Nuclear magnetic resonance (NMR) is a physical phenomenon in which nuclei in a strong constant magnetic field are perturbed by a weak oscillating magnetic field (in the near field) and respond by producing an electromagnetic signal with a frequency characteristic of the magnetic field at the process occurs near resonance, when the oscillation frequency matches the intrinsic.Abstract Pulsed deuteron NMR offers new possibilities for the determination of the distribution of correlation times for local motions in glassy polymers.
The NMR line shape is a superposition of spectra corresponding to the different values of the correlation times.The molecular order and mobility of two liquid-crystalline polyacrylates with phenyl benzoate moieties as mesogenic side groups and (CH2)m spacers (m = 2 and m = 6) were investigated by pulsed 2H NMR.