Complexation of Al(iii) with gluconate in alkaline to hyperalkaline solutions

Formation, stability and structure

Attila Pallagi, Ágost Gyula Tasi, G. Peintler, P. Forgó, I. Pálinkó, P. Sipos

Research output: Contribution to journalArticle

6 Citations (Scopus)

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-.

Original languageEnglish
Pages (from-to)13470-13476
Number of pages7
JournalDalton Transactions
Volume42
Issue number37
DOIs
Publication statusPublished - Oct 7 2013

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Complexation
Nuclear magnetic resonance
Condensation reactions
Titration
Freezing
Geometry
gluconic acid

ASJC Scopus subject areas

  • Inorganic Chemistry

Cite this

Complexation of Al(iii) with gluconate in alkaline to hyperalkaline solutions : Formation, stability and structure. / Pallagi, Attila; Tasi, Ágost Gyula; Peintler, G.; Forgó, P.; Pálinkó, I.; Sipos, P.

In: Dalton Transactions, Vol. 42, No. 37, 07.10.2013, p. 13470-13476.

Research output: Contribution to journalArticle

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