A new hydroxypyrone powerful chelator. from synthesis to AlIII, FeIII, CuII and ZnII complex formation equilibria, and structural characterization

In the frame of our research interest on kojic acid derivatives as powerful chelators for the trivalent iron and aluminium cations [1-4], we have designed, synthesized, and characterized the new ligand 6,6'-(((2-(diethylamino)ethyl)azanediyl)bis(methylene))bis(5-hydroxy-2-(hydroxymethyl)-4H-pyran-4-one), L9. In this communication will be present the study on protonation constants and on the complex formation equilibria with iron and aluminium and with the bivalent essential metal ions, zinc and copper. X-ray structures of the ligand and of some of its metal complexes will be also presented.