Some factors affecting metal – ion monohydroxamate interaction in aqueous solution

Farkas, Etelka and Enyedy, Éva Anna and Csóka, Hajnalka (2000) Some factors affecting metal – ion monohydroxamate interaction in aqueous solution. JOURNAL OF INORGANIC BIOCHEMISTRY, 79 (1-4). pp. 205-211. ISSN 0162-0134

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Abstract

The chelating properties exhibited by a series of monohydroxamic acids (propanohydroxamic acid (Pha), hexanohydroxamic acid (Hha), benzohydroxamic acid (Bha), N-methyl-acetohydroxamic acid (MAha), N-phenyl-acetohydroxamic acid (PhAha) and 2-hydroxypyridine- N-oxide (PYRha)) towards copper(II), nickel(II), zinc(II), calcium(II), magnesium(II) and aluminium(III) ions were studied by pHmetric, spectrophotometric and, in one case, by 27Al NMR methods. The results were compared with the corresponding data for metal ion– acetohydroxamate (Aha) and metal ion–desferrioxamine B (DFB) complexes. Changes of the substituents either on the carbon or on the nitrogen of the hydroxamate moiety caused a measurable effect on the chelate stability only in the case of aluminium(III) complexes. The aromatic derivative, PYRha, formed significantly more stable complexes than expected on the basis of the ligand basicity. The higher complexforming ability of DFB compared to monohydroxamic acids diminishes in the case of the largest calcium(II) ion.

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