The MINDO/3 SCF MO method
has been used to investigate the equilibrium geometries, electronic structure
and ground state properties of ply and its univalent ions. The results indicate
that ply has a low energy of disproportionation and that electron addition or
removal leads to little structural change. From an analysis of the results it
is concluded that odd-alternant hydrocarbons, and systems based on the ply
nucleus in particular, have many of the characteristics which are considered to
be important in the design of organic metals and superconductors.