Abstract
The interaction of zinc(II) ion with d-glucoheptonic acid, d-gluconic acid, d-gulonic acid, d-galactonic acid and d-ribonic acid has been investigated and compounds of the type Zn( d-glucoheptonate) 2·3H 2O, Zn( d-gluconate) 2·3H 2O, Zn( d-gulonate) 2·3H 2O, Zn( d-galactonate) 2·3H 2O and Zn( d-ribonate) 2·H 2O, have been isolated. These metal-sugar salts were characterized by elemental analysis, FT IR spectroscopy, thermogravimetric analysis and 13C-NMR. Spectroscopic measurements showed similar patterns between these complexes and the structurally identified Mn( d-gluconate) 2·2H 2O. 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 the 13C 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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