Scalar coupling values
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publisher={American Chemical Society}, | publisher={American Chemical Society}, | ||
url={http://dx.doi.org/10.1021/ja01113a001} | url={http://dx.doi.org/10.1021/ja01113a001} | ||
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} | } | ||
+ | #schwalbe09 http://dx.doi.org/10.1007/s10858-009-9323-1 | ||
</biblio> | </biblio> | ||
[[Category:Scalar Coupling]] | [[Category:Scalar Coupling]] | ||
[[Category:Reference data]] | [[Category:Reference data]] | ||
[[Category:Draft articles]] | [[Category:Draft articles]] |
Current revision
Contents |
Aromatic groups
Ortho 6-9 Hz
Meta 1-3 Hz
Para 0-1 Hz
All couplings of same sign (?)
Nucleotides
Article [1] has a diagram with some J couplings in Ade base.
Vicinal couplings
Ethylene - trans 19.0 Hz; cis - 11.7 Hz. Values are reduced by electronegative substituents.
Approx as:
Jtrans = 19.0 - 3.3δE
Jcis = 11.7 - 4.0δE
where δE is Electronegativity in Huggins scale, relative to proton.
Geminal couplings
Ethylene 2.5 Hz (Ref 11 in paper below). Decreases with increase of electronegativity of X in CH2=CHX. +7.5 Hz where X=Li, -3.2 Hz where X=F
References
- http://dx.doi.org/10.1007/s10858-009-9323-1
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Banwell, CN and Sheppard, N. (H, H) coupling constants in the nuclear magnetic resonance spectra of hydrocarbon groupings. Discussions of the Faraday Society 34:115--126, 1962. BibTeX
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Huggins, ML. Bond Energies and Polarities. Journal of the American Chemical Society 75(17):4123--4126, 1953. BibTeX