|Science & Fun | Home | Introduction into the 1H NMR Spectroscopy|
|The value of the coupling
constant J depends on the
If there are four bonds between the two coupling nucleii, the coupling constant typically already drops towards zero.
So-called long range couplings across a larger number of bonds typically only occurs if more polarizable p-bond systems are involved. (e.g., H-C=C-C-H).
Similar as in the case of the chemical shifts, it is possible to make quantitative predictions for J based on empirical and theoretical studies. A table with the values for common functional groups can be found here.