Structural diversity of coordination compounds derived from double-chelating and planar diazinedicarboxylate ligands

The use of diazinedicarboxylate ligands in the construction of preconceived molecular entities and crystal structures deserves a good understanding of their coordination capacity in order to employ them for their rational design of functional materials. Therefore, the scope of the present review is to provide a comprehensive account of the architectures built up from these ligands rationalizing them through a conscientious analysis of their coordination modes in which the preponderance for establishing double chelating five-member rings holds a central role. The study covers the coordination features offered by transition, representative and lanthanide metal ions, with special emphasis on the coordination mode prevalence for each ligand. The structural rationalization is assessed during the examples along with their more relevant properties. (C) 2017 Elsevier B.V. All rights reserved.