Interaction of zinc(II) ion withd-aldonic acids in the crystalline solid and aqueous solution
1994; Elsevier BV; Volume: 13; Issue: 6-7 Linguagem: Inglês
10.1016/s0277-5387(00)83009-0
ISSN1873-3719
AutoresGraciela M. Escandar, Manuel González Sierra, Juan Manuel Salas Peregrín, Guillermo R. Labadié, Mabel Santoro, Alejandro Frutos, Luis F. Sala,
Tópico(s)Amino Acid Enzymes and Metabolism
ResumoThe interaction of zinc(II) ion withd-glucoheptonic acid,d-gluconic acid,d-gulonic acid,d-galactonic acid andd-ribonic acid has been investigated and compounds of the type Zn(d-glucoheptonate)2·3H2O, Zn(d-gluconate)2·3H2O, Zn(d-gulonate)2·3H2O, Zn(d-galactonate)2·3H2O and Zn(d-ribonate)2·H2O, have been isolated. These metal-sugar salts were characterized by elemental analysis, FT IR spectroscopy, thermogravimetric analysis and13C-NMR. Spectroscopic measurements showed similar patterns between these complexes and the structurally identified Mn(d-gluconate)2·2H2O. The zinc(II) ion is binding to two ligand molecules through the car☐ylate and OH groups of each sugar, as well as to water molecules. The potentiometric measurements in aqueous solutions for the systems formed by the sugar acids investigated and the zinc(II) ion at different metal-ligand ratios showed the 1:1 complexes formation. On the basis of the13C NMR, the participation of C-1 and C-2 in this complex formation was verfiied. Due to the hydroxide precipitation, quantitative evaluation of the stability constants was not performed.
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