We have determined the on-site molecular Coulomb interaction energy U of a ͑C 59 N͒ 2 bulk film and find values ranging from 1.10± 0.10 eV for the highest occupied molecular orbital to 1.35± 0.10 eV for the deeper lying orbitals, comparable to values found in C 60 . The on-site Coulomb interaction between a carbon core hole and valence electrons, U c , is, however, substantially lower than in C 60 at 1.35± 0.07 eV. Resonant photoemission ͑RESPES͒ results show a weakened participator decay channel, especially around the N 1s threshold, where resonance of the highest occupied molecular orbital shoulder is absent. Near-edge x-ray absorption fine structure and constant initial state measurements, taken in parallel with the RESPES data, indicate, however, that matrix element effects cannot be ruled out.