Thermodynamic studies of slow metal exchange processes in ionophoric calix[n]]arenes with a capsule-like closed cavity

Yoshio Suzuki, Hideyuki Otsuka, Atsushi Ikeda, Seiji Shinkai

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

It was found that in a triply-capped calix[6]arene (1) and doubly-bridged calix[8]arene (2a and 2b) with a closed ionophoric cavity the Cs+ complexation occurs very slowly in a human time-scale and can be followed by a conventional spectroscopic method. The unusual behavior has enabled us to determine their kinetic activation parameters for both the forward and the reverse reaction. The results established that being different from the concept believed so far, the Cs+ complexation is heavily governed by the entropy term but not by the enthalpy term.

Original languageEnglish
Pages (from-to)421-424
Number of pages4
JournalTetrahedron Letters
Volume38
Issue number3
DOIs
Publication statusPublished - Jan 20 1997

All Science Journal Classification (ASJC) codes

  • Biochemistry
  • Drug Discovery
  • Organic Chemistry

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