On the basis of its intensity and position
these were tentatively assigned to the π−π* charge-transfer
transitions associated with conjugated dipyrrinato moiety and
intraligand π−π* transitions (Figure 3).9,10,27 In addition, both
the complexes exhibited a broad hump at ∼530 nm, which was
tentatively assigned to the metal-to-ligand charge-transfer
(MLCT) transition.