Issue 37, 2013
From the journal:

Dalton Transactions

Complexation of Al(iii) with gluconate in alkaline to hyperalkaline solutions: formation, stability and structure†

Attila Pallagi,a   Ágost Gyula Tasi,a   Gábor Peintler,b   Péter Forgo,c   István Pálinkód  and  Pál Sipos*a  

* Corresponding authors

a Department of Inorganic and Analytical Chemistry, University of Szeged, Dóm tér 7, Szeged, Hungary
E-mail: sipos@chem.u-szeged.hu
Fax: +36 62 544 340
Tel: +36 62 544 054

b Department of Physical Chemistry and Material Science, University of Szeged, Aradi Vértanúk tere 1, Szeged, Hungary

c Eszterházy Károly College, Institute of Food Science, Leányka út 6/D, Eger, Hungary

d Department of Organic Chemistry, University of Szeged, Dóm tér 8, Szeged, Hungary

Abstract

Contrary to suggestions in the literature, it has been proven that Al(III) forms a 1 : 1 complex with gluconate (hereafter Gluc−) in strongly alkaline (pH > 12) aqueous solutions. The complex formation was proven via27Al and 1H NMR, freezing-point depression, polarimetric measurements as well as potentiometric and conductometric titrations. This complexation is a pH independent process, i.e., a condensation reaction takes place. The stability constant of the complex formed was derived from 1H NMR and polarimetric measurements, and was found to be log K = 2.4 ± 0.4. In the complex formed, Al(III) has a tetrahedral geometry, and the Al(OH)4− is most probably statistically distributed between the alcoholate groups of the Gluc−.

Graphical abstract: Complexation of Al(iii) with gluconate in alkaline to hyperalkaline solutions: formation, stability and structure

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Article information

DOI
https://doi.org/10.1039/C3DT51401C
Article type
Paper
Submitted
29 May 2013
Accepted
10 Jul 2013
First published
11 Jul 2013

Dalton Trans., 2013,42, 13470-13476

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Complexation of Al(III) with gluconate in alkaline to hyperalkaline solutions: formation, stability and structure

A. Pallagi, Á. G. Tasi, G. Peintler, P. Forgo, I. Pálinkó and P. Sipos, Dalton Trans., 2013, 42, 13470 DOI: 10.1039/C3DT51401C

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