The spectroscopic impact of interactions with the four Gouterman orbitals from peripheral decoration of porphyrins with simple electron withdrawing and donating groups

Angel Zhang, Lydia Kwan, Martin J. Stillman
2017 Organic and biomolecular chemistry  
Porphyrin β-substitution with strong electron withdrawing groups splits the LUMO, red-shifts the Q band, and introduces a dipole moment.
doi:10.1039/c7ob01960b pmid:28914323 fatcat:nkozwyaagjbdtll6heaf6uh4aq