Copper(II) complexation by (pyridinyl)aminomethane-1,1-diphosphonic acid derivatives; spectroscopic and potentiometric studies |
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Authors: | Teresa Kowalik-Jankowska Marta PietruszkaJulia Jezierska Ewa Matczak-JonPawe? Kafarski |
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Institution: | a Faculty of Chemistry, University of Wroc?aw, F. Joliot-Curie 14, 50-383 Wroc?aw, Poland b Department of Chemistry, Wroc?aw University of Technology, Wybrze?e Wyspiańskiego 27, 50-370 Wroc?aw, Poland |
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Abstract: | The complex formation between copper(II) and (pyridinyl)aminomethane-1,1-diphosphonic acid derivatives was studied by means of pH-potentiometry, spectroscopic methods (UV-Vis, EPR) and mass spectrometry (MS). The bisphosphonate ligands form polynuclear Cu3HxL3 (x = 4 ,3, 2, 1, 0, −1) species besides the mononuclear 1:1 and 1:2 metal-to-ligand molar ratio complexes. Two phosphonate groups are basic binding sites for the metal ion. It is suggested that in the polynuclear complexes the ligands adopt chelating and bridging modes via the four oxygen atoms of the two phosphonate groups. |
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Keywords: | Copper(II) complexes Diphosphonic acids Stability constants Spectroscopic studies |
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