  Filling of single-wall carbon nanotubes with C59N azafullerene derivatives is
reported from toluene solvent at ambient temperature. The filling is
characterized by high resolution transmission electron microscopy and Raman
spectroscopy. The filling efficiency is the same as for C60 fullerenes and the
tube-azafullerene interaction is similar to the tube-C60 interaction. Vacuum
annealing of the encapsulated azafullerene results in the growth of inner
tubes, however no spectroscopic signature of nitrogen built in the inner walls
is detected.
