INOR 10 |
| p-Hydroquinones along with their oxidation products, p-semiquinones and p-quinones, comprise perhaps the quintessential organic electron and hydrogen transfer systems. The interaction of p-hydroquinones with vanadium, in high oxidation states, presents additional interest due to the participation of vanadium in redox reactions in biological systems such as the reduction of vanadium(V), present in sea water, to vanadium(III) in the blood cells of tunicates. A strategy to prepare such species is to synthesize substituted, in the o-position, p-hydroquinones with substituents containing one or more donor atoms, thus enabling the metal atom to form chelate rings. Reaction of the aminocarboxylate p-hydroquinone derivatives with V(IV) and/or V(V) resulted into the formation of new dinuclear and tetranuclear V(IV/V) complexes. The oxidation state of the vanadium ions and that of the ligand is pH dependent and the mechanisms involved in this redox pH dependent behavior were investigated by NMR, EPR, UV-VIS, IR spectroscopy, Xray-crystallography and electrochemistry.
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5th International Symposium on Chemistry and Biological Chemistry of Vanadium
8:40 AM-12:30 PM, Sunday, 10 September 2006 Moscone Center -- Room 304, Oral
Division of Inorganic Chemistry |
