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.

H-H coupling

Environment	Coupling	Value (Hz)
Aliphatic, H-C-H, geminal	²J_HH	-15 - -10
Aliphatic, H-C-C-H	³J_HH	6-8
Aldehyde, H-C-CO-H	³J_HH	2-3
Alkene, H-C-H, geminal	²J_HH	0-3
Alkene, H-C=C-H, trans	³J_HH	12-18
Alkene, H-C=C-H, cis	³J_HH	6-12
Aromatic, H-C~C-H	³J_HH	6-10
Aromatic, H-C~C~C-H	⁴J_HH	1-3

C-H coupling

Environment	Coupling	Value (Hz)
Aliphatic, C-H	¹J_CH	125-135
Aliphatic, CX-H (X=N,O,S)	¹J_CH	135-155
Alkene, =C-H	¹J_CH	155-170
Alkyne, ≡C-H	¹J_CH	240-250
Aromatic, ~C-H	¹J_CH	155-165

¹⁹F coupling

Environment	Coupling	Value (Hz)
C-F	¹J_CF	160
C-C-F	²J_CF	20-50
C-C-C-F	³J_CF	5
H-C-F	²J_HF	40-60
H-C-C-F	³J_HF	2-15
H-C-C-C-F	⁴J_HF	5

³¹P coupling

Environment	Coupling	Value (Hz)
H-P	¹J_HP	180-200
H-C-P	²J_HP	0.5
H-C-C-P	³J_HP	14
H-P=O	¹J_HP	630
H-C-P=O	²J_HP	12
H-C-C-P=O	³J_HP	16
H-C-O-P=O (nucleic acid backbone)	³J_HP	4-10

Peptide one bond

Environment	Coupling	Value (Hz)
C-H	¹J_HC	140
C-C	¹J_CC	35
C-CO	¹J_CC	55
N-H	¹J_NH	-92
N-Ca	¹J_NC	-11
N-CO	¹J_NC	-15

Peptide two bond

Environment	Coupling	Value (Hz)
H-N-Ca	²J_HC	2
H-N-CO	²J_HC	4
Ha-Ca-N	²J_HN	1
Ha-Ca-CO	²J_HC	-4
Ha-Ca-Cb	²J_HC	-6
Ca-N-CO	²J_CC	-0.7
Ca-CO-N	²J_CN	7
Cb-Ca-N	²J_CN	-0.7
Cb-Ca-CO	²J_CC	0.3
CO-Ca-N	²J_CN	-0.2

Peptide three bond

Environment	Coupling	Value (Hz)
H-N-Ca-Ha	³J_HH	8
H-N-Ca-Cb	³J_HC	1
H-N-Ca-CO	³J_HC	1
Ha-Ca-N-CO	³J_HC	3
CO-N-Ca-Cb	³J_CC	1.7
CO-N-Ca-CO	³J_CC	0.8