Thread:Comparison of HN and CH coupings (5)

Yeah, but if the gyromagnetic ratio of nitrogen was the same than the one of carbon the coupling would be stronger, so if we consider only a electronic point of view the coupling between carbon, the coupling from proton to nitrogen is strong as the one from proton to carbon. Of course this is not the order we will give on a experimental point of view.

On the other hand the coupling between proton on a electronic point of view is very weak, because despite their scalar coupling constant that is in not that's weak, their is their high gyromagnetic ratio, so the electronic state of proton is not very favorable to J-coupling.