Tetraazaoctaphyrin: A Biimidazole-containing Expanded Porphyrin

Sessler, J. L.; Rubin, B. L.; Stępień M.; Köhler, T.; Pantos, G. D.; Roznyatovskiy, V.
Can. J. Chem. 2006, 84, 1218-1225 | view at publisher's site

A series of expanded porphyrins, incorporating biimidazoles and bipyrroles within their macrocyclic framework, has been synthesized. Insights into the complex conformational characteristics of these ems were obtained from two-dimensional NMR spectroscopic studies. The relative energy values for the various asymmetric structures inferred from these analyses were compared using DFT molecular modeling calculations.