The average saddling angles Ω and χ were 19.0 • and 41.7 Specifically, the PBE0 Ω angle in the unsubstituted and triphenyl copper corrole is 5.4 • and 7.6 • , respectively. The calculations above resulted in an Ω angle of 11.3 • for the unsubstituted copper corrole and 18.3 • for the triphenyl copper corrole. Nevertheless, despite the fact that the DFT functionals do not describe the correct electronic state, their geometries are reasonable. However, if one wishes perform an optimization on the multireference singlet surface, one can do so with XMS-CASPT2.