Computational design of linear, flat, and tubular nanomolecules using planar tetracoordinate carbon C2Al4 units

► Nanomolecules with C2Al4 double planar tetracoordinate carbon cores. ► The nanomolecules include linear chains, flat sheets, and nanotubes. ► The electron structure of C2Al4 cores are not damaged in the nanomolecules.