scholarly journals The carbon chemical shift tensor in polyoxymethylene

1987 ◽  
Vol 87 (12) ◽  
pp. 6854-6858 ◽  
Author(s):  
W. E. J. R. Maas ◽  
A. P. M. Kentgens ◽  
W. S. Veeman
Keyword(s):  
Chemical Shift ◽  
Chemical Shift Tensor ◽  
Carbon Chemical Shift

Carbon Chemical Shift Tensor Components in Quinolines and QuinolineN-Oxides

2006 ◽  
Vol 110 (1) ◽  
pp. 234-240 ◽  
Author(s):  
Leah B. Casabianca ◽  
Caitlyn M. Faller ◽  
Angel C. de Dios
Keyword(s):  
Chemical Shift ◽  
Chemical Shift Tensor ◽  
Carbon Chemical Shift

Intermolecular Interactions of Xe Atoms Confined in One-dimensional Nanochannels of Tris(o-phenylenedioxy)cyclotriphosphazene as Studied by High-pressure 129Xe NMR

2003 ◽  
Vol 58 (12) ◽  
pp. 727-734 ◽  
Author(s):  
Hirokazu Kobayashi ◽  
Takahiro Ueda ◽  
Keisuke Miyakubo ◽  
Taro Eguchi
Keyword(s):  
High Pressure ◽  
Nmr Spectroscopy ◽  
Chemical Shift ◽  
Pressure Dependence ◽  
Average Distance ◽  
Chemical Shift Tensor ◽  
Axially Symmetric ◽  
One Dimensional ◽  
129Xe Nmr ◽  
The One

The pressure dependence of the 129Xe chemical shift tensor confined in the Tris(o-phenylenedioxy) cyclotriphosphazene (TPP) nanochannel was investigated by high-pressure 129Xe NMR spectroscopy. The observed 129Xe spectrum in the one-dimensional TPP nanochannel (0.45 nm in diameter) exhibits a powder pattern broadened by an axially symmetric chemical shift tensor. As the pressure increases from 0.02 to 7.0 MPa, a deshielding of 90 ppm is observed for the perpendicularcomponent of the chemical shift tensor δ⊥, whereas a deshielding of about 30 ppm is observed for the parallel one, δ‖. This suggests that the components of the chemical shift tensor, δ‖ and δ⊥, are mainly dominated by the Xe-wall and Xe-Xe interaction, respectively. Furthermore, the effect of helium, which is present along with xenon gas, on the 129Xe chemical shift is examined in detail. The average distance between the Xe atoms in the nanochannel is estimated to be 0.54 nm. This was found by using δ⊥ at the saturated pressure of xenon, and comparing the increment of the chemicalshift value in δ⊥ to that of a β -phenol/Xe compound.

Magic-Angle-Turning Experiments for Measuring Chemical-Shift-Tensor Principal Values in Powdered Solids

1995 ◽  
Vol 113 (2) ◽  
pp. 210-222 ◽  
Author(s):  
J.Z. Hu ◽  
W. Wang ◽  
F. Liu ◽  
M.S. Solum ◽  
D.W. Alderman ◽  
...  
Keyword(s):  
Chemical Shift ◽  
Chemical Shift Tensor ◽  
Magic Angle

Deshielding γ–gauche effects in 13C magnetic resonance: a comparison of the conformational behaviour of the acetyl group in cyclohexane and 5-substituted-1,3-dioxane systems

1984 ◽  
Vol 62 (7) ◽  
pp. 1308-1311 ◽  
Author(s):  
G. W. Buchanan ◽  
S. H. Preusser ◽  
V. L. Webb
Keyword(s):  
Magnetic Resonance ◽  
Chemical Shift ◽  
Low Temperature ◽  
Direct Measurement ◽  
Carbonyl Carbon ◽  
Acetyl Group ◽  
Carbon Chemical Shift ◽  
Reported Data

Low temperature (173 K) 13C spectra of acetylcyclohexane, 1-acetyl-1-methylcyclohexane, and 5-acetyl-5-methyl-1,3-dioxane are reported. Data permit the first direct measurement of −ΔG0 for the acetyl group bonded to cyclohexane. The value obtained, 1.02 ± 0.05 kcal/mol in CS2–CD2Cl2 solution, is considerably lower than that determined by equilibration methods. Factors contributing to observed axial–equatorial carbonyl carbon chemical shift differences for substituted cyclohexanes and 1,3-dioxanes are discussed.

Total assignment of the carbon-13 NMR spectrum of the cembranoid diterpene eunicin through the use of two-dimensional proton-carbon chemical shift correlation

1984 ◽  
Vol 106 (6) ◽  
pp. 1823-1826 ◽  
Author(s):  
Robert T. Gampe ◽  
Maktoob Alam ◽  
Alfred J. Weinheimer ◽  
Gary E. Martin ◽  
James A. Matson ◽  
...  
Keyword(s):  
Chemical Shift ◽  
Two Dimensional ◽  
Chemical Shift Correlation ◽  
Nmr Spectrum ◽  
Carbon Chemical Shift

Cluster Analysis of13C Chemical Shift Tensor Principal Values in Polycyclic Aromatic Hydrocarbons

2001 ◽  
Vol 105 (31) ◽  
pp. 7468-7472 ◽  
Author(s):  
Julio C. Facelli ◽  
Bret K. Nakagawa ◽  
Anita M. Orendt ◽  
Ronald J. Pugmire
Keyword(s):  
Cluster Analysis ◽  
Polycyclic Aromatic Hydrocarbons ◽  
Chemical Shift ◽  
Aromatic Hydrocarbons ◽  
Chemical Shift Tensor ◽  
Polycyclic Aromatic
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