  One-dimensional CL-20 chains have been constructed using CH$_2$ molecular
bridges for the covalent bonding between isolated CL-20 fragments. The energy
and electronic properties of the nanostructures obtained have been analyzed by
means of density functional theory and nonorthogonal tight-binding model
considering Landauer-B\"uttiker formalism. It has been found that such systems
become more thermodynamically stable as the efficient length of the chain
increases. Thus, the formation of bulk covalent CL-20 solids may be
energetically favorable, and such structures may possess high kinetic stability
comparing to the CL-20 molecular crystals. As for electronic properties of pure
CL-20 chains, they are wide-bandgap semiconductors with energy gaps equal to
several electron volts that makes their use in nanoelectronic applications
problematic without any additional modification.
