Temperature Dependence of the Deuterium Quadrupole Coupling Constants and the Correlation Times for Neat Formamide

2000 ◽  
Vol 104 (22) ◽  
pp. 5328-5334 ◽  
Author(s):  
Mary J. Hansen ◽  
Mark A. Wendt ◽  
Thomas C. Farrar
Keyword(s):  
Temperature Dependence ◽  
Coupling Constants ◽  
Correlation Times ◽  
Quadrupole Coupling

19F Nuclear Quadrupole Coupling in some Halomethanes

1986 ◽  
Vol 41 (1-2) ◽  
pp. 171-174 ◽  
Author(s):  
M. Frank ◽  
F. Gubitz ◽  
W. Ittner ◽  
W. Kreische ◽  
A. Labahn ◽  
...  
Keyword(s):  
Angular Distribution ◽  
Simple Model ◽  
Temperature Dependence ◽  
Coupling Constants ◽  
Temperature Dependent ◽  
Distribution Method ◽  
Quadrupole Coupling ◽  
Time Differential ◽  
Nuclear Quadrupole

The 19F quadrupole coupling constants in CF4, CHF3, CClF3 and CHClF2 are reported. The measurements were carried out temperature dependent using the time differential perturbed angular distribution method (TDPAD). The temperature dependence can be satisfactorily described in the framework of the Bayer-Kushida theory. A simple model is used to explain the appearance of H-F and Cl-F coupling constants in CHF3/CHClF2 and CClF3, respectively.

Temperature Dependence of 2H Quadrupole Coupling Constants in 2H2O and Ionic Motions in Crystalline [M(2H2O)6] [SnCl6] (M: Mg, Ca), Studied by 2H NMR and Neutron Powder Diffraction

1998 ◽  
Vol 53 (6-7) ◽  
pp. 473-479 ◽  
Author(s):  
Naohiro Yoshida ◽  
Noriko Onoda-Yamamuro ◽  
Shin'ichi Ishimaru ◽  
Keizo Horiuchi ◽  
Ryuichi Ikeda
Keyword(s):  
Temperature Dependence ◽  
Powder Diffraction ◽  
Room Temperature ◽  
Neutron Powder Diffraction ◽  
Coupling Constants ◽  
H Nmr ◽  
Octahedral Cation ◽  
Quadrupole Coupling ◽  
Large Asymmetry ◽  
Motional Narrowing

Abstract The temperature dependence of 2H NMR spectra was measured at 130-430 K on [M(D2O)6] [SnCl6] (M : Mg, Ca) (rhombohedral, space group: R3̅), and neutron powder diffraction on the Mg salt was performed at room temperature. Based on the accurate orientation of D2O molecules in an octahedral cation, spectra with a large asymmetry parameter η, observed around 200 K, were explained by a model of 180° flip of water molecules. Another motional narrowing observed above room temperature was assigned to a cationic overall reorientation about the C3-axis.

The influence of like-charge attraction on the structure and dynamics of ionic liquids: NMR chemical shifts, quadrupole coupling constants, rotational correlation times and failure of Stokes–Einstein–Debye

2018 ◽  
Vol 20 (8) ◽  
pp. 5617-5625 ◽  
Author(s):  
Anne Strate ◽  
Viviane Overbeck ◽  
Viktoria Lehde ◽  
Jan Neumann ◽  
Anne-Marie Bonsa ◽  
...  
Keyword(s):  
Ionic Liquids ◽  
Chemical Shifts ◽  
Coupling Constants ◽  
Correlation Times ◽  
Nmr Chemical Shifts ◽  
Structure And Dynamics ◽  
Quadrupole Coupling ◽  
Rotational Correlation Times ◽  
Rotational Correlation

The formation of clusters of like-charge influences the structure and dynamics of ionic liquids.

Spektroskopische Untersuchungen in der Festkörperchemie, XIII. Temperaturabhängigkeit der 127I-Kernquadrupolkopplung in NH4IO4 und anderen Periodaten / Spectroscopic Investigations in the Solid State Chemistry, XIII. Temperature Dependence of the 127I-Nuclear Quadrupole Coupling in NH4IO4 and other Periodates

1980 ◽  
Vol 35 (11) ◽  
pp. 1349-1354 ◽  
Author(s):  
Paul K. Burkert
Keyword(s):  
Temperature Dependence ◽  
Coupling Constants ◽  
Solid State Chemistry ◽  
Positive Temperature ◽  
Electric Field Gradients ◽  
Field Gradients ◽  
Quadrupole Coupling ◽  
Temperature Dependences ◽  
Nuclear Quadrupole ◽  
Nmr Signals

The temperature dependence of the electric field gradients was measured by I. and II. order quadrupole effects of the 127I NMR signals in scheelite-structured NH4IO4 and RbIO4, in pseudo-scheelite CsIO4 and in N(CH3)4IO4, where rcation > ranion- An interpretation of the anomalous positive temperature dependences of the quadrupole coupling constants in NH4IO4 and in the isostructural NH4ReO4 is proposed.

A nuclear magnetic resonance relaxation study of liquid hydrogen cyanide

1987 ◽  
Vol 65 (9) ◽  
pp. 2077-2081 ◽  
Author(s):  
Roderick E. Wasylishen
Keyword(s):  
Temperature Dependence ◽  
Lattice Relaxation ◽  
Relaxation Mechanism ◽  
Coupling Constants ◽  
Spin Lattice Relaxation ◽  
Correlation Times ◽  
Spin Lattice ◽  
Quadrupolar Coupling ◽  
Quadrupolar Relaxation ◽  
Resonance Relaxation

The rates of 2H, 13C, and 14N spin-lattice relaxation for liquid deuterium cyanide have been studied as a function of temperature. The quadrupolar nuclei relax exclusively by the quadrupolar relaxation mechanism while the rate of 13C and 15N relaxation is completely dominated by the spin-rotation mechanism. The apparent activation energy that describes the temperature dependence of spin-lattice relaxation for all nuclei studied is approximately 1.6 kcal mol−1. The temperature dependence of the rate of 13C relaxation in liquid HCN was also investigated. Although the determination of very accurate rotational and angular momentum correlation times is hampered by intermolecular effects on the nuclear quadrupolar coupling constants and the appropriately averaged C—H bond separation, the derived correlation times for DCN and HCN are in reasonable agreement (± 15%).

Temperature dependence of the14N quadrupole coupling constants in pyrazine

1974 ◽  
Vol 60 (11) ◽  
pp. 4295-4299 ◽  
Author(s):  
A. Péneau ◽  
M. Gourdji ◽  
L. Guibé
Keyword(s):  
Temperature Dependence ◽  
Coupling Constants ◽  
Quadrupole Coupling

Correlation Times and Quadrupole Coupling Constants in Neat, Liquid Formamide

1995 ◽  
Vol 99 (24) ◽  
pp. 9681-9686 ◽  
Author(s):  
R. Ludwig ◽  
J. Bohmann ◽  
T. C. Farrar
Keyword(s):  
Coupling Constants ◽  
Correlation Times ◽  
Quadrupole Coupling
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