The chameleon-like coordinating ability of 2,3-di(pyridyl)pyrazine-type ligands

This report illustrates the structural features of the mono-, di- and multinuclear complexes, whenever crystallographic information was available. In the absence of X-ray work, as is the case for tri-, tetra-, and multinuclear systems, the overall organization of the complex systems is that proposed by the authors. Synthetic procedures, physicochemical properties, especially UV-visible spectroscopic and electrochemical behaviour, are given some attention.