The sporadic μ-pyridine bridge in transition metal complexes: A real bond or an interaction?

The present perspective focuses on a rarely observed pyridine bridge [mu-eta(1)(N)] over a transition metal ion, yielding complexes of varying geometry and nuclearity. Using over 20 of these types of ligands the stereochemical properties of approximately 37 discrete coordination complexes have been interpreted and studied by Single-Crystal X-Ray Crystallography. Notably this class of complexes have been utilised for pharmacological and biological activities. Recently few groups observed that bridged pyridine complexes can be employed in the field of catalysis. Other applications include their employment for magnetochemical studies as well as in supramolecular chemistry. The ligands are arranged systematically making easy access to information on specific type of ligands and their corresponding coordination complexes. X-ray crystallographically determined bond distance of bridging pyridine moieties with metal ions along with certain other bond parameters. (C) 2021 Elsevier B.V. All rights reserved.

Automated summary

This study focuses on the rarely observed phenomenon of a pyridine bridge covering transition metal ions to form complexes of varying geometry and nuclearity. Approximately 37 discrete coordination complexes with different stereochemical properties were interpreted and studied using Single-Crystal X-Ray Crystallography. These complexes have been utilized for pharmacological and biological activities, as well as in the field of catalysis and magnetochemical studies.