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Russian Chemical Bulletin

, Volume 53, Issue 12, pp 2670–2673 | Cite as

Thermodynamics of ion exchange of H+ by Na+ or NH4+ on ion-exchange resins based on C-tetramethylcalix[4]resorcinarene

  • G. N. Altshuler
  • E. V. Ostapova
  • L. A. Sapozhnikova
  • O. G. Altshuler
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Abstract

The corrected selectivity coefficients of the ion exchange H+-Na+ and H+-NH4+ on ion-exchange resins based on C-tetramethylcalix[4]resorcinarene were calculated from the experimental data obtained from studying ion-exchange equilibria. The preference of the ion-exchange resins for cations increases in the sequence: Na+ < NH4+ < < H+, and the ion-exchange resin based on (2-furyl)hydroxymethyltetramethylcalix[4]resorcinarene has a higher preference for ammonium cations. According to the results of microcalorimetric measurements, the exchange H+-Na+ on this ion-exchange resin is accompanied by the highest change in the differential enthalpy. It follows from the quantum-chemical calculations that the introduction of a (2-furyl)hydroxymethyl group into the structure of the polymer induces additional electrostatic interactions between an ammonium cation and an elementary unit of the ion-exchange resin.

Key words

cation-exchange resin C-tetramethylcalix[4]resorcinarene ammonium cation sodium cation corrected selectivity coefficient of ion exchange differential enthalpy quantum-chemical calculation 

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Copyright information

© Springer Science+Business Media, Inc. 2004

Authors and Affiliations

  • G. N. Altshuler
    • 1
  • E. V. Ostapova
    • 1
  • L. A. Sapozhnikova
    • 1
  • O. G. Altshuler
    • 1
  1. 1.Kemerovo Division of the Institute of Solid State Chemistry and Mechanochemistry, Siberian BranchRussian Academy of SciencesKemerovoRussian Federation

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