  We present a tight-binding parametrization for penta-graphene that correctly
describes its electronic band structure and linear optical response. The set of
parameters is validated by comparing to ab-initio density functional theory
calculations for single-layer penta-graphene, showing a very good global
agreement. We apply this parameterization to penta-graphene nanoribbons,
achieving an adequate description of quantum-size effects. Additionally, a
symmetry-based analysis of the energy band structure and the optical
transitions involved in the absorption spectra is introduced, allowing for the
interpretation of the optoelectronic features of these systems.
