Long-Range Nuclear Spin-Spin Coupling. Allenic and Polyacetylenic Systems

1962 ◽  
Vol 84 (9) ◽  
pp. 1582-1586 ◽  
Author(s):  
Eugene I. Snyder ◽  
John D. Roberts
Keyword(s):  
Long Range ◽  
Nuclear Spin ◽  
Spin Coupling ◽  
Spin Spin Coupling

Signs and mechanisms of 13C, 19F spin–spin coupling constants in benzotrifluoride and its derivatives

1983 ◽  
Vol 61 (12) ◽  
pp. 2779-2784 ◽  
Author(s):  
Ted Schaefer ◽  
Kirk Marat ◽  
James Peeling ◽  
Richard P. Veregin
Keyword(s):  
Long Range ◽  
Spin State ◽  
Nuclear Spin ◽  
Opposite Sign ◽  
Coupling Constants ◽  
Spin Coupling ◽  
State Information ◽  
Spin Coupling Constants ◽  
Spin Spin Coupling

The magnitudes of nJ(C, F) for n = 3, 4, 5 bonds are remeasured for benzotrifluoride. The signs of 2J(C, F) and 3J(C, F) are determined for 4-chloro-3,5-dinitrobenzotrifluoride and that of 5J(C, F) for 2-amino-3,5-dibromobenzotrifluoride. 4J(C, F) is not observable in these compounds. The contact contributions to nJ(C, F) are calculated for benzotrifluoride by INDO MO FPT. The long-range coupling constants are discussed in terms of the mechanisms which transmit nuclear spin state information. It seems that 5J(C, F) is a σ–π coupling, 4J(C, F) is a composite of a and σ–π components of opposite sign, and that 3J(C, F) has a Karplus behaviour modified by a σ–π contribution.

Long-range nuclear spin-spin coupling between selenium-77 and phosphorus-31 in biphosphorus compounds

1979 ◽  
Vol 12 (8) ◽  
pp. 473-475 ◽  
Author(s):  
Ian J. Colquhoun ◽  
H. Christina E. McFarlane ◽  
William McFarlane ◽  
John A. Nash ◽  
Rodney Keat ◽  
...  
Keyword(s):  
Long Range ◽  
Nuclear Spin ◽  
Spin Coupling ◽  
Spin Spin Coupling

Vibrational and thermal averaging of the indirect nuclear spin-spin coupling constants of CH4, SiH4, GeH4 and SnH4

1997 ◽  
Vol 91 (5) ◽  
pp. 897-907 ◽  
Author(s):  
SHEELA KIRPEKAR ◽  
THOMAS ENEVOLDSEN ◽  
JENS ODDERSHEDE ◽  
WILLIAM RAYNES
Keyword(s):  
Nuclear Spin ◽  
Coupling Constants ◽  
Spin Coupling ◽  
Spin Coupling Constants ◽  
Spin Spin Coupling
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