Metalation Chemistry of meso‐Aryl‐Substituted Expanded Porphyrins

Abstract meso‐Aryl‐substituted expanded porphyrins are structural analogues of meso‐aryl‐substituted porphyrins. They exhibit rich and novel coordination behaviors, including multi‐metal chelation due to the large cavities, spin–spin interaction arising from the proximity of metal centers, and large changes in their structural and electrochemical properties upon metalation. The recent discovery of a facile, one‐pot synthesis of a series of meso‐aryl‐substituted expanded porphyrins enables us to investigate their metal‐complexation chemistry. The aim of this Microreview is to highlight recent progress in the synthesis and characterization of metal complexes of meso‐aryl‐substituted expanded porphyrins. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2006)