Thread:Comparison of HN and CH coupings (3)

I'm not telling about the absolute value, but for a given gyromagnetic ratio of N vs the one of C, the coupling to the proton is stronger is the case of NH than the one of CH, if N had the same gyromagnetic ratio as the carbon.

2.5*gC=gN

the JCH should be 220 Hz, and not less that 200 Hz, if the electronic configuration of the carbon was the same as the one of nitrogen.

thanks for the aromatic 1JCH coupling constant, I didn't know that it change that's much ( but hybridization state change from sp3 to sp2 ). In which case we get 120 Hz ?