title: Pi-metal complexes of tetrapyrrolic systems. A novel coordination mode in "porphyrin-like" chemistry.
abstract: The coordination chemistry of porphyrins and related tetrapyrrolic ligands has traditionally centered around the ability of these systems to form pyrrole N-ligated complexes via the formation of sigma bonds, either within the N(4) core or displaced above it. In fact, such sigma-complexes are known with almost every metal cation in the periodic table. However, a growing number of pi-complexes derived from tetrapyrrolic ligands have been reported in recent years. The underlying coordination mode, while still novel in the context of "porphyrin-like" chemistry, is already being recognized for the effects it can impart over the reactivity, as well as the spectroscopic, redox, electronic, and optical properties of various oligopyrrolic macrocycles. This critical review summarizes accomplishments made in this fast-emerging field (59 references).
authors.affiliation: Departamento de Compuestos Organometálicos, Instituto de Ciencia de Materiales de Aragón, CSIC-Universidad de Zaragoza, 50009 Zaragoza, Spain. luciano@unizar.es
authors.forename: Luciano
authors.initials: L
authors.lastname: Cuesta
authors.forename: Jonathan L
authors.initials: JL
authors.lastname: Sessler
mesh_terms: D008670:Metals / Q000737:chemistry*; D008956:Models, Chemical; D008958:Models, Molecular; D011166:Porphyrins / Q000737:chemistry*
chemical_list: D008670:Metals; D011166:Porphyrins