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Issue 23, 2013
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Multinuclear complex formation in aqueous solutions of Ca(II) and heptagluconate ions

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Abstract

The equilibria and structure of complexes formed between the Ca2+ ion and the heptagluconate (Hglu) ion in both neutral and alkaline solutions have been studied. In alkaline solutions an uncharged, multinuclear complex is formed with the composition of Ca3Hglu2(OH)4 (or [Ca3Hglu2H−4]0) with an unexpectedly high stability constant (lg β32–4 = 14.09). The formation of the trinuclear complex was deduced from potentiometry and confirmed by freezing-point depression measurements and conductometry as well. The binding sites of Hglu were determined from NMR measurements. Besides the carboxylate group, the O atoms on the second and third carbon atoms proved to be the most probable sites for Ca2+ binding.

Graphical abstract: Multinuclear complex formation in aqueous solutions of Ca(ii) and heptagluconate ions

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Publication details

The article was received on 11 Jan 2013, accepted on 09 Apr 2013, published on 09 Apr 2013 and first published online on 09 Apr 2013


Article type: Paper
DOI: 10.1039/C3DT00099K
Citation: Dalton Trans., 2013,42, 8460-8467
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    Multinuclear complex formation in aqueous solutions of Ca(II) and heptagluconate ions

    A. Pallagi, Z. Csendes, B. Kutus, E. Czeglédi, G. Peintler, P. Forgo, I. Pálinkó and P. Sipos, Dalton Trans., 2013, 42, 8460
    DOI: 10.1039/C3DT00099K

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