Temperature dependence of the acid–base and Ca2+-complexation equilibria of D-gluconate in hyperalkaline aqueous solutions

Ákos Buckó, Bence Kutus, G. Peintler, I. Pálinkó, P. Sipos

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

In the current work, the hyperalkaline complexation processes in the Ca2+/D-gluconate (Gluc) system have been studied under hypersaline conditions (I = 4 M NaCl on the molar and Im = 4.38 mol kg−1 on the molal scale, respectively) and over the temperature range of 25–75 °C by pH potentiometry using H2/Pt electrode and 13C NMR spectroscopy. The potentiometric method was validated at 75 °C. The deprotonation of the alcoholic OH group(s) of the ligand was also investigated. Finally, the temperature dependence of the stability constants of the mono- and polynuclear complexes forming in the Ca2+/Gluc/OH system was determined as well. At this high ionic strength, the formation of anionic complexes seems to be facilitated by ion pair formation.

Original languageEnglish
Pages (from-to)117-124
Number of pages8
JournalPolyhedron
Volume158
DOIs
Publication statusPublished - Jan 15 2019

Fingerprint

Complexation
aqueous solutions
potentiometric analysis
temperature dependence
Deprotonation
Ionic strength
Nuclear magnetic resonance spectroscopy
Ligands
Ions
Temperature
nuclear magnetic resonance
ligands
Electrodes
electrodes
spectroscopy
ions
temperature
gluconic acid

Keywords

  • Calcium complexation
  • Complex equilibria
  • D-Gluconate
  • Hyperalkaline and hypersaline solutions
  • Temperature dependence

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Inorganic Chemistry
  • Materials Chemistry

Cite this

Temperature dependence of the acid–base and Ca2+-complexation equilibria of D-gluconate in hyperalkaline aqueous solutions. / Buckó, Ákos; Kutus, Bence; Peintler, G.; Pálinkó, I.; Sipos, P.

In: Polyhedron, Vol. 158, 15.01.2019, p. 117-124.

Research output: Contribution to journalArticle

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AU - Buckó, Ákos

AU - Kutus, Bence

AU - Peintler, G.

AU - Pálinkó, I.

AU - Sipos, P.

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