Methyl NMR relaxation: The effects of spin rotation and chemical shift anisotropy mechanisms

1977 ◽  
Vol 67 (11) ◽  
pp. 5152-5161 ◽  
Author(s):  
Gerald B. Matson
Keyword(s):  
Chemical Shift ◽  
Chemical Shift Anisotropy ◽  
Nmr Relaxation ◽  
Spin Rotation

Selenium-77 and phosphorus-31 nuclear spin relaxation in tri-(tert-butyl) phosphine selenide

1991 ◽  
Vol 69 (7) ◽  
pp. 1054-1056 ◽  
Author(s):  
Glenn H. Penner
Keyword(s):  
Chemical Shift ◽  
Nuclear Spin ◽  
Chemical Shift Anisotropy ◽  
Relaxation Times ◽  
Nmr Relaxation ◽  
Lattice Relaxation ◽  
Spin Rotation ◽  
Spin Lattice Relaxation ◽  
Phosphine Selenide ◽  
High Fields

Selenium-77 and phosphorus-31 spin-lattice relaxation times are reported for tri-tert-butylphosphine selenide in chloroform-d, at 303 K and at several different magnetic field strengths. At moderate fields the 31P–1H dipole–dipole, spin-rotation, and chemical shift anisotropy mechanisms contribute significantly towards the 31P T1. At high fields chemical shift anisotropy dominates. The selenium-77 nuclear spin relaxes almost exclusively by spin rotation at low to moderate fields and the chemical shift anisotropy contribution only becomes significant at very high fields. This is due to an unusually small 77Se CSA. The contribution due to 31P–77Se dipole–dipole interactions is small but significant. Key words: 77Se NMR, NMR relaxation, phosphine selenide.

Temperature Dependence of Molecular Conformation, Dynamics, and Chemical Shift Anisotropy of α,α-Trehalose in D2O by NMR Relaxation

1997 ◽  
Vol 119 (6) ◽  
pp. 1336-1345 ◽  
Author(s):  
Gyula Batta ◽  
Katalin E. Kövér ◽  
Jacquelyn Gervay ◽  
Miklós Hornyák ◽  
Gareth M. Roberts
Keyword(s):  
Chemical Shift ◽  
Temperature Dependence ◽  
Molecular Conformation ◽  
Chemical Shift Anisotropy ◽  
Nmr Relaxation

103Rh-NMR bei 9,4 T - Verbesserter Nachweis infolge verkürzter Relaxationszeiten und selektivem Polarisationstransfer / 103Rh NMR at 9.4 T - Improved Signal Detection due to Shortened Relaxation Times and Selective Polarisation Transfer

1985 ◽  
Vol 40 (12) ◽  
pp. 1763-1765 ◽  
Author(s):  
Reinhard Benn ◽  
Herbert Brenneke ◽  
Rolf-Dieter Reinhardt
Keyword(s):  
Chemical Shift ◽  
Magnetic Fields ◽  
Signal Detection ◽  
Chemical Shift Anisotropy ◽  
Relaxation Times ◽  
Spin Rotation ◽  
Proton Spin ◽  
High Magnetic Fields

Abstract At 9.4 T the I03Rh relaxation times (T ,) of unsym metrical organorhodium com pounds of the type LR h(7r-ligand) 2 are in the order of seconds, and relaxation is dominated by the Chemical Shift Anisotropy mechanism. In symmetrical complexes like (acac)3Rh (7), T, of 103Rh is considerably longer and dominated by the Spin Rotation mechanism. Through this effect, together with selective polarisation transfer via the Rh olefin-proton spin-spin couplings at high magnetic fields, a significantly improved detection of the insensitive Rh nucleus results

13C NMR Relaxation Rates:  Separation of Dipolar and Chemical Shift Anisotropy Effects

2004 ◽  
Vol 108 (29) ◽  
pp. 6096-6099 ◽  
Author(s):  
W. Robert Carper ◽  
Phillip G. Wahlbeck ◽  
Andreas Dölle
Keyword(s):  
Chemical Shift ◽  
13C Nmr ◽  
Chemical Shift Anisotropy ◽  
Nmr Relaxation ◽  
Relaxation Rates
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