Nuclear magnetic shielding calculations in the finite perturbation method involving GIAO's at the INDO level and London's approximation. II. Carbon-13 and nitrogen-15

Magnetic shielding constants, calculated for C-13 and N-15 nuclei in the finite perturbation method using INDO and London's approximations, are analyzed in terms of mono-, di-, and tricentric contributions, thus permitting an assessment of the relative importance of local vs. nonlocal contributions. For both C-13 and N-15, it appears that the changes in total shielding are almost entirely dictated by those of the local paramagnetic contribution, i.e., [Formula: see text].