Electron propagator calculations on electron affinities of ZnC5H5+ and ionization energies of ZnC5H5- provide ZnC5H5 excitation energies. Excited states involving ligand-to-Zn charge transfer or promotion of an electron from one Zn-centered hybrid to another are studied. The lowest excited state, which is of the former type, lies 2.76 eV above the ground state. The next lowest state, with an unpaired electron in a Zn-centered, p-like hybrid orbital, is 1.73 eV above the ground state. Vertical electron detachment energies of ZnC5H5-, as well as the vertical ionization energy and several vertical electron affinities of ZnC5H5+, are determined. ZnC5H5’s adiabatic ionization energy, 7.12 eV, and adiabatic electron affinity, 1.33 eV, are inferred from additional calculations. Vertical ionization energies of Zn(C5H5)(2) are calculated with similar techniques. Bond energies for the dissociation of one or both C5H5 ligands have been estimated. Structures and total energies pertaining to ZnC5H5, ZnC5H5+, ZnC5H5-, Zn(C5H5)2, and C5H5 are reported as well.