Journal
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
Volume 5, Issue 4-7, Pages 174-185Publisher
MDPI
DOI: 10.3390/i5040174
Keywords
C-H center dot center dot center dot pi interactions; transition metal complexes; chelate ring; porphyrin; axial ligands
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Cambridge Structural Database (CSD) was screened in order to find intramolecular C-H...pi interactions with a chelate ring of coordinated porphyrin. It was found 154 crystal structures with 244 intramolecular C-H...pi 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.
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