A ¹³⁹La NMR study of the interactions between the La(III) cation and D-ribose in aqueous solution

Abstract

ZHIGANG CHEN, NICOLE MOREL-DESROSERS, JEAN-PIERRE MOREL; and CHRISTIAN DETELLIER Can. J. Chem. 72, 1753Chem. 72, (1994. The interactions of the La(II1) cation with D-ribose and with D-arabinose in aqueous solution were investigated by 1 3 9~a NMR spectroscopy. In the case of D-ribose, the formation of a La(II1)-sugar complex was indicated by variations of the ' 3 9~a chemical shift and linewidth with an increase of the sugar concentration in solution. In contrast, the complexation of La(II1) by arabinose is very weak and almost undetectable by "' La NMR. On the basis of a 1:l stoichiometry, the stability constant for the complex of La (II1)

Cationic lanthanide complexes of neutral tripodal N,O ligands: enthalpy versus entropy-driven podate formation in water

“…Indeed, thermodynamic data determined by NMR and the van't Hoff equation have been demonstrated to be in good agreement with calorimetric results for weak lanthanide() complexes in water. [27][28][29] This analysis was not possible for Tb, Dy and Ho, because of the very small values of the proton transverse relaxation times, giving rise to important errors in the equilibrium constant determination.…”

Sugar–Metal Ion Interactions: The Complicated Coordination Structures of Cesium Ion with d-Ribose and myo-Inositol

“…Ribose interaction and complex formation with metal ions in neutral solutions have been studied for a large number of ions, e.g. La 3+ , Ce 3+ , Pr 3+ , Nd 3+ , Sm 3+ , Eu 3+ , Gd 3+ , Tb 3+ , Ca 2+ , Sr 2+ , Ba 2+ , Cu 2+ , and Mn 2+ , mainly using calorimetric methods or NMR spectroscopy. − The investigation of the interaction of alkali halides with d -ribose by 1 H and 13 C NMR spectroscopy shows that the anion has a significant role . Interactions of aluminum­(III) with the biologically relevant ligand d -ribose has been discussed at different pH values and the results indicate the existence of association between Al­(III) and d -ribose, stabilization of the “association” complex through hydrogen bonding, and subsequent complexation through proton release .…”