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Formation of oligonuclear complexes between copper(II) and 1-hydroxyethane-1,1-diphosphonic acid |
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| Authors: | Saad Bouhsina Edmond Abi Aad Tamás Kiss |
| Institution: | a LISE Unité CNRS ELICO/UMR 8013 MREID 145, Avenue Maurice Schumman, 59140 Dunkerque, France b Department of Inorganic and Analytical Chemistry, University of Debrecen, P.O. Box 21, H-4010 Debrecen, Hungary c Laboratoire d’Catalyse et Environnement, EA 2598, MREID 145, Avenue Maurice Schumman, 59140 Dunkerque, France d Department of Inorganic and Analytical Chemistry, Biocoordination Chemistry Research Group of the Hungarian Academy of Sciences, University of Szeged, P.O. Box 440, H-6701 Szeged, Hungary |
| Abstract: | The complex formation between Cu(II) and 1-hydroxyethane-1,1-diphosphonic acid was studied by means of pH-potentiometry and spectroscopy (UV-Vis and EPR). Speciation revealed the formation of a trinuclear complex Cu3A3]6− besides the mononuclear 1:1 and 1:2 species. In the complex Cu3A3]6− , which is not formed with other diphosphonic derivatives, the ligands adopt chelating and bridging modes via the four O atoms of the two phosphonates, the alcoholic-OH groups remaining in the protonated form. |
| Keywords: | Copper(II) Phosphonates Speciation Spectroscopy Bioinorganic chemistry |
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