Strong spin-spin coupling effects arising from fast exchange between weakly coupled spin systems

1981 ◽  
Vol 44 (2) ◽  
pp. 270-276
Author(s):  
K.V Vasavada ◽  
J.I Kaplan ◽  
B.D Nageswara Rao
Keyword(s):  
Spin Systems ◽  
Spin Coupling ◽  
Coupling Effects ◽  
Weakly Coupled ◽  
Fast Exchange ◽  
Spin Spin Coupling ◽  
Strong Spin ◽  
Coupled Spin Systems

A Theoretical Application of 3D J-Resolved NMR Spectroscopy for ISnKm (I = 1/2, S = 1/2 and 1, K = 3/2) Spin Systems

2003 ◽  
Vol 58 (2-3) ◽  
pp. 139-143 ◽  
Author(s):  
I. Şaka ◽  
Ö. Tezel ◽  
A. Gençten
Keyword(s):  
Nmr Spectroscopy ◽  
Operator Theory ◽  
Analytical Description ◽  
Spin Systems ◽  
Spin Coupling ◽  
Weakly Coupled ◽  
Product Operator ◽  
Coupling Parameters ◽  
Theoretical Application ◽  
Spin Spin Coupling

In 3D J-resolved NMR spectroscopy, the chemical shift along one axis and the spin-spin coupling parameters along the two other different axes are resolved. Product operator theory is used for the analytical description of multi-dimensional NMR experiments on weakly coupled spin systems. In this study, the product operator description of heteronuclear 3D J-resolved NMR spectroscopy of weakly coupled ISn Km (I = 1/2, S = 1/2 and 1, K = 3/2) spin systems is presented.

Weiss's endo- and exo-tetracyclo[5.5.1.0.2,6 010,13]tridecane-4,8,12-trione: analysis of 1H NMR couplings in a system of fused 5-membered rings

1994 ◽  
Vol 72 (9) ◽  
pp. 1926-1932 ◽  
Author(s):  
Steven H. Bertz ◽  
Weijiang Zhang ◽  
James M. Cook ◽  
Martha D. Bruch ◽  
Lynn W. Jelinski
Keyword(s):  
Spin Systems ◽  
Coupling Constants ◽  
Spin Coupling ◽  
Theoretical Treatment ◽  
H Nmr ◽  
Tightly Coupled ◽  
Nmr Techniques ◽  
Spin Coupling Constants ◽  
Stringent Test ◽  
Spin Spin Coupling

The configurational isomers of the title compounds consist of four fused five-membered rings. They contain tightly coupled 1H NMR spin systems, which provide excellent models for establishing the relationships between coupling constants and conformation. Complete chemical shift assignments and spin–spin coupling constants are reported for the title compounds by using high-field (500 MHz) 1H NMR techniques (e.g., 2D homonuclear and heteronuclear experiments, difference NOE enhancements, and computational spin simulations). In addition to the more familiar two- and three-bond couplings, the spectra of 1 and 2 also contain a number of long-range (four- and five- bond) couplings, which provide a stringent test of Barfield's theoretical treatment of four-bond couplings.

Strong spin-spin coupling in the two-dimensional J-resolved 360-MHz 1H NMR spectra of the common amino acids

1981 ◽  
Vol 42 (1) ◽  
pp. 73-87 ◽  
Author(s):  
Gerhard Wider ◽  
Rudolf Baumann ◽  
Kuniaki Nagayama ◽  
Richard R Ernst ◽  
Kurt Wüthrich
Keyword(s):  
Amino Acids ◽  
1H Nmr ◽  
Nmr Spectra ◽  
1H Nmr Spectra ◽  
Spin Coupling ◽  
Two Dimensional ◽  
The Common ◽  
Spin Spin Coupling ◽  
Strong Spin
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