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

doi:10.1016/S0040-4039(96)02315-5

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 journal › Article › peer-review

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 language	English
Pages (from-to)	421-424
Number of pages	4
Journal	Tetrahedron Letters
Volume	38
Issue number	3
DOIs	https://doi.org/10.1016/S0040-4039(96)02315-5
Publication status	Published - Jan 20 1997
Externally published	Yes

All Science Journal Classification (ASJC) codes

Biochemistry
Drug Discovery
Organic Chemistry

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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.",

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AU - Suzuki, Yoshio

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AU - Ikeda, Atsushi

AU - Shinkai, Seiji

PY - 1997/1/20

Y1 - 1997/1/20

N2 - 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.

AB - 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.

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

Abstract

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