The coordination chemistry of 4-substituted 3,5-di(2-pyridyl)-4H-1,2,4-triazoles and related ligands

The coordination chemistry of 4-substituted 3,5-di(2-pyridyl)-4H-1,2,4-triazoles, as well as of the related ligands 2,5-di(2-pyridyl)1,3,4-oxadiazole and 2,5-di(2-pyridyl)-1,3,4-thiadiazole, is comprehensively reviewed. Literature surveys of the known 4-substituted 3,5-di(2-pyridyl)-4H-1,2,4-triazoles and their complexes are provided, selected representative examples are presented and the various coordination modes that have been observed in complexes of these potentially dinucleating ligands are discussed. (C) 2003 Elsevier Science B.V. All rights reserved.