A multinuclear nuclear magnetic resonance study of t-butylthiol

1985 ◽  
Vol 63 (11) ◽  
pp. 2926-2932 ◽  
Author(s):  
Sandra Mooibroek ◽  
Roderick E. Wasylishen
Keyword(s):  
Relaxation Times ◽  
Lattice Relaxation ◽  
Rotational Correlation Time ◽  
Nuclear Magnetic Resonance Study ◽  
Spin Lattice Relaxation ◽  
Spin Lattice ◽  
Isotropic Reorientation ◽  
Line Narrowing ◽  
Abrupt Changes ◽  
Order Of Magnitude

Deuterium nmr lineshapes for polycrystalline samples of (CD3)3CSH and (CH3)3CSD have been investigated between 110 and 200 K. Unlike t-butylchloride-d9 which undergoes line narrowing in three distinctive stages, t-butylthiol-d9 undergoes almost complete motional line narrowing at 120 ± 5 K. Above the solid II ↔ solid I phase transition no quadrupolar splitting is observed, consistent with rapid "isotropic" reorientation in the solid I phase.An analysis of the 2H and 13C spin–lattice relaxation times of (CD3)3CSH, (CH3)3CSD and unlabelled t-butylthiol in both liquid and solid phases is also reported. The rotational correlation time is observed to decrease by an order of magnitude at the solid II ↔ solid I transition and to increase slightly at the melting point. Deuterium T1s in solids III and IV of the labelled species indicate abrupt changes at the phase transitions and motion slower than ω0−1 in solid IV.

A nuclear magnetic resonance study of pyridoxal phosphate – metal ion interactions. II. Binding of manganese(II)

1979 ◽  
Vol 57 (9) ◽  
pp. 1050-1055 ◽  
Author(s):  
Tenkasi S. Viswanathan ◽  
Terrence J. Swift
Keyword(s):  
Metal Ion ◽  
Pyridoxal Phosphate ◽  
Lattice Relaxation ◽  
Dipolar Interaction ◽  
Rotational Correlation Time ◽  
Nuclear Magnetic Resonance Study ◽  
Spin Lattice Relaxation ◽  
Relaxation Rates ◽  
Spin Lattice ◽  
Nmr Methods

The line width and spin–lattice relaxation rates of phosphorus and proton nuclei in PLP have been measured as a function of temperature in the presence of Mn(II) using pulsed nmr methods. The T1M of 31P in PLP-Mn(II) is very close to the T1M values of β- and γ-phosphorus atoms in ATP–Mn(II) at ∼40 °C. The T1 data of 31P and 1H have been interpreted in terms of the dipolar interaction between the electron and nuclear spins. With the assumption that the Mn(II) interacts directly with the phosphate of PLP the rotational correlation time τc at 38 °C was calculated to be 7.6 × 10−10 s from phosphorus T1 data. This τc value was subsequently used to calculate metal–proton distances from proton T1 and T2 data. The results lead to the conclusion that the phosphate-bound metal interacts directly with the aldehyde oxygen in a 1:1 PLP–Mn(II) complex. The linewidth of the 13C resonances of PLP in the presence of Mn(II) supports this conclusion. The structure assigned for PLP–Mn(II) complex is in conformity with the structure for PLP-Co(II) complex.

A nuclear magnetic resonance study of 1H, 23Na, and 31P relaxation and molecular dynamics in the sodium salts of some pyrophosphates

1989 ◽  
Vol 67 (6) ◽  
pp. 592-598 ◽  
Author(s):  
E. C. Reynhardt
Keyword(s):  
Relaxation Times ◽  
Lattice Relaxation ◽  
Laboratory Frame ◽  
Nuclear Magnetic Resonance Study ◽  
Spin Lattice Relaxation ◽  
Molecular Reorientation ◽  
Temperature Range ◽  
Spin Lattice ◽  
Second Moments ◽  
31P Relaxation

Proton second moments and spin-lattice relaxation times in the laboratory and rotating frames and 31P and 23Na spin-lattice relaxation times in the laboratory frame have been measured over the temperature region 295 > T > 100 K for the sodium pyrophosphate salts, Na2P2O7∙10H2O and Na2H2P2O7. Laboratory-frame 31P and 23Na spin-lattice relaxation times have also been measured over the same temperature range for Na4P2O7. In the case of Na4P2O7∙10H2O, the results show clearly that the H2O molecules execute a twofold jump motion at higher temperatures. The potential barriers to these motions range from 30 to 40 kJ/mol. The 31P and 23Na relaxations are also influenced by these motions. The [Formula: see text] ion in Na2H2P2O7 is stationary over the temperature range studied. T1(Na) is most probably dominated by acoustical lattice vibrations. The [Formula: see text] ion in Na4P2O7 is not involved in a molecular reorientation. A shallow T1(P) minimum of 55 s is associated with a limited motion of the pyrophosphate molecule.

Characterization of Amorphous and Crystalline TiCuDx By Deuteron Magnetic Resonance

1986 ◽  
Vol 80 ◽  
Author(s):  
M. P. Volz ◽  
V. P. Bork ◽  
P. A. Fedders ◽  
R. E. Norberg ◽  
R. C. Bowman ◽  
...  
Keyword(s):  
Magnetic Resonance ◽  
Amorphous Material ◽  
Relaxation Times ◽  
Lattice Relaxation ◽  
Spin Lattice Relaxation ◽  
Conduction Electrons ◽  
Spin Lattice ◽  
Order Of Magnitude ◽  
Deuteron Spin

AbstractThe structure and dynamics of a-TiCu(D,H)1.7 and a-TiCu(D,H)1.4 have been examined by Fourier transform quadrupole echo DMR line shape and relaxation time measurements at 30.7 MHz. The quadrupole-broadened a-TiCu(D,H)x line widths narrowed appreciably above 300 K because of increased D mobility. Low temperature DMR spectra show that static quadrupolar broadening is larger for amorphous samples than for crystalline samples. Deuteron spin lattice relaxation is attributed to conduction electrons below 200 K and to quadrupolar interactions at higher temperatures where deuteron hopping becomes significant. The spin lattice relaxation times indicate that the deuteron mobility is larger by an order of magnitude in the amorphous material than in the crystalline counterparts. Results are compared with those from proton magnetic resonance in corresponding hydrides.

NUCLEAR MAGNETIC RESONANCE STUDY OF 205Tl IN MULTIPHASE Tl-Ba-Ca-Cu OXIDE SUPERCONDUCTORS

1988 ◽  
Vol 02 (05) ◽  
pp. 1227-1234 ◽  
Author(s):  
L. Mihály ◽  
K. Tompa ◽  
I. Bakonyi ◽  
P. Bánki ◽  
É. Zsoldos ◽  
...  
Keyword(s):  
Room Temperature ◽  
Relaxation Times ◽  
Lattice Relaxation ◽  
Nuclear Magnetic Resonance Study ◽  
Spin Lattice Relaxation ◽  
Oxide Superconductors ◽  
X Ray Diffraction ◽  
Magnetic Resonance Study ◽  
X Ray ◽  
Spin Lattice

Several batches of T l- Ba - Ca - Cu oxide superconductors have been synthesized and characterized by resistivity, magnetic susceptibility and X-ray diffraction measurements. The 205 T l NMR line snifts (K), the spin-lattice and spin-spin relaxation times have been measured at room temperature. The temperature dependence of the spin-lattice relaxation rate is also reported. The resonance around K = 0.25 % has a composite line shape indicating the presence of two T l sites. The two sites are tentatively assigned to thallium atoms in the (2223) and (2212) T l- Ba - Ca - Cu phases.

The effects of high temperatures (29–123 °C) on critical micelle concentrations in solutions of potassium n-octanoate in deuterium oxide: A nuclear magnetic resonance study

1986 ◽  
Vol 64 (9) ◽  
pp. 1823-1828 ◽  
Author(s):  
M. A. Desando ◽  
L. W. Reeves
Keyword(s):  
Chemical Shifts ◽  
Deuterium Oxide ◽  
Relaxation Times ◽  
Lattice Relaxation ◽  
Nuclear Magnetic Resonance Study ◽  
Spin Lattice Relaxation ◽  
Spectral Parameters ◽  
Critical Micelle Concentrations ◽  
Temperature Range ◽  
Spin Lattice

Critical micelle concentrations have been determined for potassium n-octanoate in deuterium oxide over a wide temperature range, 29–123 °C, from the concentration dependence of proton nmr spectral parameters (peak positions, and vicinal splitting values of the α-CH2 multiplet) and carbon-13 nmr chemical shifts. The c.m.c. varies from ca. 0.30 m at ca. 30 °C to ca. 0.50 m at ca. 120 °C and is at a minimum (0.30–0.35 m) in the temperature range ca. 30–50 °C. 23Na+ spin-lattice relaxation times reveal that a co-counterion (Na+) different from that of the surfactant counterion (K+) reflects the micellization process. A second critical micelle concentration has been observed around 1.0 m at ca. 30 °C.

Nuclear magnetic resonance study of conformation and dynamics in solution of p-(o-propyloxybenzamido)benzoate diethyl(2-hydroxyethyl)methylammonium bromide: a smooth muscle relaxant agent

1984 ◽  
Vol 62 (11) ◽  
pp. 2131-2135 ◽  
Author(s):  
Gianni Valensin ◽  
Lionello Pogliani ◽  
Mario Ghelardoni ◽  
Vittorio Pestellini ◽  
Alessandro Sega
Keyword(s):  
Title Compound ◽  
Relaxation Times ◽  
Lattice Relaxation ◽  
Nuclear Magnetic Resonance Study ◽  
Proton Spin ◽  
Spin Lattice Relaxation ◽  
Complete Analysis ◽  
Aromatic Rings ◽  
Spin Lattice ◽  
Smooth Muscle Relaxant

The relative conformation of the aromatic rings and the amide bridge as well as important details of the two side chains of the title compound in a DMSO-d6 solution have been established by use of non-selective and selective proton spin-lattice relaxation times coupled with nOe experiments. The complete analysis of 13C spin-lattice relaxation times has shown the main features of the dynamic behavior of the title compound.

Influence of cross-relaxation on NMR spin-lattice relaxation times

1973 ◽  
Vol 11 (2) ◽  
pp. 143-162 ◽  
Author(s):  
I.D Campbell ◽  
Ray Freeman
Keyword(s):  
Relaxation Times ◽  
Lattice Relaxation ◽  
Cross Relaxation ◽  
Spin Lattice Relaxation ◽  
Spin Lattice
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