Vanadium(IV) species that have the V=O group have quite distinct spectra. What is the d-electron configuration of V(IV)? The most symmetrical of such complexes are [VOL₅] with C_4v symmetry, with the O atom on the z-axis. What are the symmetry species of the five d orbitals in [VOL₅] complexes? How many d–d bands are expected in the spectra of these complexes? A band near 24000 cm⁻¹ in these complexes shows vibrational progressions of the V=O vibration, implicating an orbital involving V=O bonding. Which d–d transition is a candidate?