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Cambridge Structural Database (CSD) was screened in order to find intramolecular CÃ¢ÂˆÂ’HÃ‚Â·Ã‚Â·Ã‚Â·ÃÂ€ interactions with a chelate ring of coordinated porphyrin. It was found 154 crystal structures with 244 intramolecular CÃ¢ÂˆÂ’HÃ‚Â·Ã‚Â·Ã‚Â·ÃÂ€ interactions in transition metal complexes with derivatives of porphyrin. Comparison of interacting distances indicates that interactions of hydrogen atoms in positions 2 and 6 of axially coordinated pyridine are more favorable with ruffled than with planar porphyrin

Intramolecular C−H···π Interactions in Metal-Porphyrin Complexes