- Interaction of divalent metal ions with D-aldonic acids in the solid phase-II. Structural information
-
Complexes formed between D-glucoheptonate, D-galactonate, D-gulonate and D-ribonate, and several metal ions were obtained in the solid state. Specifically: D-glucoheptonates, Be(C7H13O8)2 · 12H2O, Mn(
- Frutos, Alejandro A.,Signorella, Sandra,Sala, Luis F.,Escandar, Graciela M.,Peregrin, Juan M. Salas,Moreno, Virtudes
-
p. 3371 - 3378
(2008/10/09)
-
- Carbohydrate Complexes with Lead(II) Ion. Interaction of Pb(II) with β-D-Glucurono-6,3-lactone, D-Glucono-1,5-lactone, and Their Acid Anions and the Effects of Metal Ion Binding on the Sugar Hydrolysis
-
The interaction of Pb(II) ion with β-D-glucurono-6,3-lactone, D-glucuronic acid, D-glucono-1,5-lactone, and their acid anions has been investigated in aqueous solution and solid compounds of the type Pb(D-glucurono-6,3-lactone)(NO3)2, Pb(D-glucuronic acid)(NO3)2, Pb(II)-D-glucuronate, Pb(D-glucono-1,5-lactone)(NO3)2, and Pb(II)-D-gluconate have been isolated.These compounds are characterized by means of FT-IR, 1H and 13C NMR spectroscopy and molar conductivity measurements.Among these Pb-sugar complexes, the crystal structure of the Pb(II)-D-gluconate is known through X-ray diffraction measurements, in which the lead(II) ion is hexacoordinated, binding to four D-gluconate anions via a carboxylato oxygen and an α-hydroxyl group of the two anions (chelation) and to a carboxylato oxygen atom of the other two sugar anions (unidentately).Spectroscopic evidence suggested that in the Pb-lactone or Pb-acid adducts, the metal ion could be bonded to a lactone or acid molecule through one of the carbonyl oxygen atom and other sugar donor group as well as to two bridging nitrato groups.In the Pb(II)-D-glucuronate, the metal ion could be bonded to four sugar moieties (similar to that of the Pb(II)-D-gluconate) via a carboxylato oxygen atom and other sugar donor group of the two anions and to a carboxylato oxygen atom of the other two acid anions, resulting into a hexa-coordinated lead(II) ion.The β-anomer sugar configuration is predominant in the free D-glucurono-6,3-lactone, D-glucuronic acid, D-glucuronate anion and in these Pb-sugar complexes.
- Tajmir-Riahi, Heidar-Ali
-
p. 1281 - 1286
(2007/10/02)
-