Interaction of divalent metal ions with D-gluconic acid in the solid phase and aqueous solution

G.M. ESCANDAR; J.M. SALAS PEREGRIN; M. GONZALEZ SIERRA; D.M. MARTINO; M. SANTORO; A.A. FRUTOS; S.I. GARCÍA; G. LABADIÉ; L.F. SALA

POLYHEDRON

Año: 1996 vol. 15 p. 2251 - 2261

0277-5387

The interaction of D-gluconic acid with Mn H, Co", Ni II, CU n, Cd", Hg II and Pb" has been investigated. Compounds of the type Mn(o-gluconate)2"3H20, Co(D-gluconate) E'3H20, Ni(o-gluconate)2"3H20, Cu(o-gluconate)2"3H20, Cd(D-gluconate)2, Hg(o-gluconate)OH and Pb(D-gluconate)2 have been isolated. These metal-sugar salts were characterized by elemental, thermogravimetric analyses and FT-IR, UV-vis absorption, EPR and 13C NMR spectroscopies. In addition, a quantitative study of the equilibria involved in the interaction of this sugar and the above mentioned metal ions in an aqueous medium was carried out by means of potentiometric measurements of the hydrogen ion concentrations at 20°C and p = 0.100 M (NaNO3). On the basis of spectroscopic studies, possible structures of these complex species were discussed.Ni II, CU n, Cd", Hg II and Pb" has been investigated. Compounds of the type Mn(o-gluconate)2"3H20, Co(D-gluconate) E'3H20, Ni(o-gluconate)2"3H20, Cu(o-gluconate)2"3H20, Cd(D-gluconate)2, Hg(o-gluconate)OH and Pb(D-gluconate)2 have been isolated. These metal-sugar salts were characterized by elemental, thermogravimetric analyses and FT-IR, UV-vis absorption, EPR and 13C NMR spectroscopies. In addition, a quantitative study of the equilibria involved in the interaction of this sugar and the above mentioned metal ions in an aqueous medium was carried out by means of potentiometric measurements of the hydrogen ion concentrations at 20°C and p = 0.100 M (NaNO3). On the basis of spectroscopic studies, possible structures of these complex species were discussed.