Molecular structure of simple mono- and diphenyl meso-substituted porphyrin diacids: influence of protonation and substitution on the distorsion

Di-meso-substituted [DPPH4]2+(CF3CO2−)2 and, mono-meso-substituted [MPPH4]2+(CF3CO2−)2 and [dedmMPPH4]2+(CF3CO2−)2 porphyrin diacids show increasingly saddled core conformation with a decrease of the peripheral substitution.