Additionally, a weak tail extending beyond 1000 nm suggests intramolecular charge transfer between the octaphyrinoid motif and the zinc ion. Theoretical calculations predict a closed-shell singlet ground state for both 1 and 1-Zn. For 1-Zn, the first two occupied frontier orbitals (HOMO and HOMO-1) are degenerate in energy and symmetry, with electron densities distributed across both octaphyrinoid rings (Supplementary Fig. ). In contrast, for the metal-free 1, the first two occupied orbitals are also degenerate, but the HOMO is primarily localized on one octaphyrinoid ring, while HOMO-1 is on the other. This suggests that the two rings in 1 are electronically nearly decoupled (Supplementary Fig. ).