Metal complexes of corrole

The coordination chemistry of corrole is one of the most intriguing aspects of this contracted porphyri- noid, for both theoretical and practical reasons. Corrole, in fact, shows a remarkable coordinative versa- tility, and several elements have been coordinated in formally high oxidation states, because of its trianionic character as ligand and the high electron density. These features, however, prompt corrole to show a non innocent ligand character, making difficult to elucidate the electronic structure of the corresponding complexes. These characteristics make corrole complexes of interest for a wide range of application fields, going from catalysis to chemical sensors. The important progresses in the synthetic pathways of this macrocycle have also been an important factor to widen the ‘‘periodic table” of metallocorroles, which is now large as much as that of the corresponding metalloporphyrins. All these features make corrole one of the most popular macrocycle in the porphyrinoids field. This is confirmed by the impressive number of the published articles related to metal complexes of corrole in the 2016–2018 period, which is the focus of this review.