Magnitude of Coupling Constants:
The magnitude of the spin-spin coupling constant is found to depend on the relative orientation and the distance of the interacting nuclei. On the basis of the data on the coupling constants of a large number of molecules different types of couplings have been identified.
Various types of spin-spin couplings and the values of their magnitudes are compiled in Table.
Table: Magnitude of different spin-spin coupling constants for protons
