Coupling constants
The tables below list coupling constants for
a few general cases. For more specific cases
see these lists of
H-H coupling constants
and
C-H coupling constants.
Environment |
Coupling |
Value (Hz) |
Aliphatic, H-C-H, geminal |
2JHH |
-15 - -10 |
Aliphatic, H-C-C-H |
3JHH |
6-8 |
Aldehyde, H-C-CO-H |
3JHH |
2-3 |
Alkene, H-C-H, geminal |
2JHH |
0-3 |
Alkene, H-C=C-H, trans |
3JHH |
12-18 |
Alkene, H-C=C-H, cis |
3JHH |
6-12 |
Aromatic, H-C~C-H |
3JHH |
6-10 |
Aromatic, H-C~C~C-H |
4JHH |
1-3 |
Environment |
Coupling |
Value (Hz) |
Aliphatic, C-H |
1JCH |
125-135 |
Aliphatic, CX-H (X=N,O,S)
| 1JCH |
135-155 |
Alkene, =C-H |
1JCH |
155-170 |
Alkyne, ≡C-H |
1JCH |
240-250 |
Aromatic, ~C-H |
1JCH |
155-165 |
Environment |
Coupling |
Value (Hz) |
C-F |
1JCF |
160 |
C-C-F |
2JCF |
20-50 |
C-C-C-F |
3JCF |
5 |
H-C-F |
2JHF |
40-60 |
H-C-C-F |
3JHF |
2-15 |
H-C-C-C-F |
4JHF |
5 |
Environment |
Coupling |
Value (Hz) |
H-P |
1JHP |
180-200 |
H-C-P |
2JHP |
0.5 |
H-C-C-P |
3JHP |
14 |
H-P=O |
1JHP |
630 |
H-C-P=O |
2JHP |
12 |
H-C-C-P=O |
3JHP |
16 |
H-C-O-P=O (nucleic acid backbone) |
3JHP |
4-10 |
Environment |
Coupling |
Value (Hz) |
C-H |
1JHC |
140 |
C-C |
1JCC |
35 |
C-CO |
1JCC |
55 |
N-H |
1JNH |
-92 |
N-Ca |
1JNC |
-11 |
N-CO |
1JNC |
-15 |
Environment |
Coupling |
Value (Hz) |
H-N-Ca |
2JHC |
2 |
H-N-CO |
2JHC |
4 |
Ha-Ca-N |
2JHN |
1 |
Ha-Ca-CO |
2JHC |
-4 |
Ha-Ca-Cb |
2JHC |
-6 |
Ca-N-CO |
2JCC |
-0.7 |
Ca-CO-N |
2JCN |
7 |
Cb-Ca-N |
2JCN |
-0.7 |
Cb-Ca-CO |
2JCC |
0.3 |
CO-Ca-N |
2JCN |
-0.2 |
Environment |
Coupling |
Value (Hz) |
H-N-Ca-Ha |
3JHH |
8 |
H-N-Ca-Cb |
3JHC |
1 |
H-N-Ca-CO |
3JHC |
1 |
Ha-Ca-N-CO |
3JHC |
3 |
CO-N-Ca-Cb |
3JCC |
1.7 |
CO-N-Ca-CO |
3JCC |
0.8 |
Written by Brendan Duggan. Last modified 2022-Jul-22
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