| Abstract
| - Oxidativeglycol cleavage of a fructan, inulin, results in a polycarboxylate,3,4-dicarboxyinulin (DCI), of superior CaII sequesteringability. DCI, and its model compounds, methyl3,4-dicarboxy-α-d-fructofuranoside (DCF) and3,4-dicarboxynystose (DCN) were studied as the LnIIIcomplexes using multinuclear magnetic resonance spectroscopy and as theCaII complexes using potentiometric methods.Denticity, stoichiometry, and binding phenomena of the complexesare discussed.
- Complexes of LnIII and CaII cations with3,4-dicarboxyinulin (DCI) and model compounds, methyl3,4-dicarboxy-α-d-fructofuranoside (DCF) and 3,4-dicarboxynystose (DCN)were studied using multinuclear magnetic resonancespectroscopy and potentiometric methods. Complexes of the modelcompounds with LnIII ions provided a feasibleway in which to study complexation phenomena of thedicarboxyinulin/CaII system using NMRtechniques.Information on complex geometry was derived from the effect ofLnIII ions on chemical shifts and longitudinalrelaxation rates. Metal−ligand stoichiometries of 1:2 and 1:1,in which the ligand coordination was tridentate aswell as tetradentate, were found. Potentiometric measurementscarried out with CaII yielded information onthestoichiometry as well as the cooperativity of metal ion binding by theligands.
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