  In this paper we use ab initio density functional theory (DFT) to calculate
the electronic properties of C_50Cl_10. In comparison with the unstable C_50
which has a small t_lu(LUMO) - h_u(HOMO) energy gap and a high total free
energy compared with C_60, the belt of chlorines atoms stabilize the C_50Cl_10
fullerene by increasing the energy gap to approximately that of C_60 and
lowering the total free energy. We also examine the effects of inter-cage
separation on the band structure for infinite periodic C_50Cl_10 chains where a
high degree of dispersion is found to persist for separations beyond the
predicted C_60 - C_60 distance of closest approach.
