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N,N′-Ethylenediaminobis(benzylphosphonic acids) as a potent class of chelators for metal ions |
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| Institution: | a Department of Inorganic Chemistry, Medical University of Wroc?aw, Szewska 38, 50-139 Wroc?aw, Poland b Department of Chemistry, Wroc?aw, University of Technology, Wybrze?e Wyspiańskiego 27, 50-370 Wroc?aw, Poland c Faculty of Chemistry, University of Wroc?aw, Joliot Curie 14, 50-383 Wroc?aw, Poland d Department of Chemical Sciences, University of Cagliari, Cittadella Universitaria, 09042 Monserrato-Cagliari, Italy |
| Abstract: | Aminophosphonates were found to be effective metal ion chelators. Ethylenediamine (EN) itself binds strongly to a series of metal ions forming efficient five-membered chelate ring using two nitrogen donors. Combination of EN with phosphonate function results in the family of low molecular chelating agents. Introduction of a pyridine moiety into EN-phosphonate structure results in the very effective ligands involving a four-nitrogen donor set to coordinate the metal ion. In this work, the potentiometric and spectroscopic data for two analogues 2,2′-(ethylenedi-imino)bis(3-pyridylphosphonic-acid) - L2 and 2,2′-(ethylenedi-imino)bis(2-pyridyl-phosphonic-acid) - L3, comprising EN, two phosphonates and two pyridines with Cu(II), Ni(II) and Zn(II) ions are presented showing very high efficacy of one of the ligands studied. |
| Keywords: | Aminophosphonates Cu(II) Ni(II) Zn(II) complexes Potentiometry UV-Vis EPR and NMR spectroscopy |
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