X-Ray analysis shows that in the porphyrin monocation one pyrrole ring, probably protonated, is tilted 14° from the plane through the other three pyrrole rings by the repulsions between the inner three hydrogen atoms.
N. Hirayama, A. Takenaka, Y. Sasada, E. Watanabe, H. Ogoshi and Z. Yoshida, J. Chem. Soc., Chem. Commun., 1974, 330 DOI: 10.1039/C39740000330
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