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

Ákos Buckó, Bence Kutus, Gábor Peintler, István Pálinkó, Pál Sipos

Research output: Contribution to journalArticle

3 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

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

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