Again, we observe an increase in the energy gaps with an increasing electron withdrawing strength of the ligand. Additionally, a new trend becomes apparent-the excitation energies increase with the number of bonds in the cation, as shown in Fig. . In the case of the transition from yttrium to zirconium and niobium cations, where the order of the ground and the first excited states changes, taking the energy of 1 2 ∆ state as the reference point allows to observe a consistent increase. This new trend is particularly apparent for the series F, O, and N as the ligands or Cl, S, and P, shown in Figs. S1 and S2 in the SI.