Thread:Comparison of HN and CH coupings (4)

According to table in "Spin dynamics" by M. Levitt, &gamma;=-27.126 rad s-1T-1 and &gamma;=67.283 rad s-1T-1 Gyromagnetic ratio article here also lists those values, but they are divided by a factor of 2&pi;

so it's &gamma;N *2.5 ~ &gamma;C and J coupling values are coming in the same order JHN < JCH.

As for hybridization of carbon, smaller coupling is with sp3, larger coupling with sp2. >200 Hz for aromatics. I guess variation in coupling value with hybridization makes sense since J coupling is mediated by the electron orbitals.