In contrast to the previous case, all transitions are now predominantly MC transitions. Yet, a similar trend is observed as in the Fe(II) system, which also exhibited a d 6 configuration. Both TDDFT and BSE@GW accurately predict two absorption peaks, though they vary with the equilibrium geometry, with the oscillator strength being particularly affected. However, in contrast to the Fe(II) system BSE@GW does not only shift the TDDFT transition energies in one particular direction, but the splitting between the peaks increases. Both levels of theory yield the best alignment with experimental values, for the OPBE case, which is also the one closest to the experimental geometry.