✦ LIBER ✦
Thermodynamic studies of slow metal exchange processes in ionophoric calix[n]arenes with a capsule-like closed cavity
✍ Scribed by Yoshio Suzuki; Hideyuki Otsuka; Atsushi Ikeda; Seiji Shinkai
- Publisher
- Elsevier Science
- Year
- 1997
- Tongue
- French
- Weight
- 219 KB
- Volume
- 38
- Category
- Article
- ISSN
- 0040-4039
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✦ Synopsis
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 timescale 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.