Journal of Solution Chemistry

, Volume 25, Issue 10, pp 955–970 | Cite as

Complexation of alkali metal cations by calix[4]Arene-bis-crown-6 in methanol, acetonitrile and propylene carbonate

  • A. D'Aprano
  • J. Vicens
  • Z. Asfari
  • M. Salomon
  • M. Iammarino
Article

Key Words

Electrolytic conductance molar conductance ion pair formation complex formation 18-crown-6 calix[4]arene-bis-crown-6 lithium perchlorate sodium perchlorate potassium perchlorate rubidium perchlorate cesium perchlorate acetonitrile methanol propylene carbonate 

Résumé

The interactions of Li+, Na+, K+, Rb+, and Cs+ with the “double-crown calix,” calix[4]arene-bis-crown-6, have been studied in methanol, acetonitrile, and propylene carbonate at 25°C using precise conductivity measurements. For Li+ and Na+ in solutions containing this calix[4]arene, only 1:1 cation:ligand complexes are formed which permit the determination of the thermodynamic complexation formation constants,Kf. The conductivity data strongly suggest that 2:1 cationcalixarene complexes form with K+, Rb+, and Cs+. The existence of 2:1 complexes was experimentally confirmed for the potassium systems by a mass spectroscopic method.

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Copyright information

© Plenum Publishing Corporation 1996

Authors and Affiliations

  • A. D'Aprano
    • 1
  • J. Vicens
    • 2
  • Z. Asfari
    • 2
  • M. Salomon
    • 3
  • M. Iammarino
    • 1
  1. 1.Department of chemistryUniversity of Rome “La Sapienza”RomeItaly
  2. 2.Laboratoire de Minéralogie et Chimie Analytique, URA 405 du C.N.R.S.European Higher Institute of Chemistry of StrasbourgStrasbourgFrance
  3. 3.Chemical/Biological Sciences DivisionU.S. Army PSD (ARL)Fort Monmouth

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