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Studies on highly substituted porphyrins bearing eight  β -substituents and at least one bulky meso-substitutent have shown that peripheral steric strain leads to considerable macrocycle distortion. While this is well established for porphyrins with dodecasubstitution; the situation is less clear for nonasubstituted porphyrins with meso-substituents such as methyl, aryl or ester groups. In order to further study this situation we have investigated the conformation of nonasubstituted porphyrins with small meso-substitutents by determination of the crystal structures of: 2,3,7,8,12,13,17,18-octaethyl-5-( N -succinimidyl)porphyrin,  1 ; 2,7,12,17-tetraethyl-3,8,13,18-tetramethyl-5-methoxymethylporphyrin,  2 ; Pyridine(2,7,12,17-tetraethyl-3,8,13,18-tetramethyl-5-methoxymethylporphyrinato)zinc(II),  3 ; methanol(5-acetoxy-2,7,12,17-tetraethyl-3,8,13,18-tetramethyl-porphyrinato)-zinc(II) methanol solvate,  4 ; and (2,3,7,8,12,13,17,18-octaethyl-5-methylporphyrinato)zinc(II),  5 . The compounds show only small deviations from planarity which might be due to packing effects, however, all compounds show some degree of rhomboic elongation of the porphyrin core.[unk]

Crystal and molecular structures of some mono-meso-substituted free base and zinc(II)octaalkylporphyrins