Based on pH-metric, spectrophotometric, and EPR measurements, stability constants and bonding modes are reported for the complexes formed in aqueous solutions of the copper(II)-, nickel(II)-, zinc(II)-, and molybdenum(VI)-desferrioxamine B (DFA) systems. Besides the totally deprotonated species, several protonated mononuclear complexes were found in the copper(II)-, nickel(II)-, and zinc(II)-DFA systems, and also the dinuclear species [Cu(2)AH](2+). All three hydroxamate groups are able to coordinate to nickel(II) and zinc(II), but only two of them to the copper(II). Molybdenum(VI) yields only one complex species, [MoO2(H(2)DFA)](+). This species, which exists below pH 7, involves two hydroxamate groups coordinated to the metal ion. DFA completely prevents the formation of polyoxomolybdates below pH 7, but MoO42- and free DFA exist above this pH. (C) 1997 Elsevier Science Inc.

Copper(II), nickel(II), zinc(II), and molybdenum(VI) complexes of desferrioxamine B in aqueous solution / Farkas, E; Csoka, H; Micera, Giovanni; Dessi, A.. - In: JOURNAL OF INORGANIC BIOCHEMISTRY. - ISSN 0162-0134. - 65:4(1997), pp. 281-286. [10.1016/S0162-0134(96)00144-4]

Copper(II), nickel(II), zinc(II), and molybdenum(VI) complexes of desferrioxamine B in aqueous solution

MICERA, Giovanni;
1997-01-01

Abstract

Based on pH-metric, spectrophotometric, and EPR measurements, stability constants and bonding modes are reported for the complexes formed in aqueous solutions of the copper(II)-, nickel(II)-, zinc(II)-, and molybdenum(VI)-desferrioxamine B (DFA) systems. Besides the totally deprotonated species, several protonated mononuclear complexes were found in the copper(II)-, nickel(II)-, and zinc(II)-DFA systems, and also the dinuclear species [Cu(2)AH](2+). All three hydroxamate groups are able to coordinate to nickel(II) and zinc(II), but only two of them to the copper(II). Molybdenum(VI) yields only one complex species, [MoO2(H(2)DFA)](+). This species, which exists below pH 7, involves two hydroxamate groups coordinated to the metal ion. DFA completely prevents the formation of polyoxomolybdates below pH 7, but MoO42- and free DFA exist above this pH. (C) 1997 Elsevier Science Inc.
1997
Copper(II), nickel(II), zinc(II), and molybdenum(VI) complexes of desferrioxamine B in aqueous solution / Farkas, E; Csoka, H; Micera, Giovanni; Dessi, A.. - In: JOURNAL OF INORGANIC BIOCHEMISTRY. - ISSN 0162-0134. - 65:4(1997), pp. 281-286. [10.1016/S0162-0134(96)00144-4]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11388/82996
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