Intramolecular co-ordination between the nitrogens of the cap and the central metal ion in the title compounds forces the porphyrin and bipyridyl groups to be perpendicular: addition of an external ligand releases the bipyridyl ligand which then lies parallel to the porphyrin.
P. Leighton and J. K. M. Sanders, J. Chem. Soc., Chem. Commun., 1984, 854 DOI: 10.1039/C39840000854
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