Redox-Switched Crown Ethers. 3. Cyclic-Acyclic Interconversion Coupled with Redox between Dithiol and Disulfide and Its Application to Membrane Transport

Seiji Shinkai, Kenichi Inuzuka, Osamu Miyazaki, Osamu Manabe

研究成果: ジャーナルへの寄稿記事

73 引用 (Scopus)

抄録

A pair of “redox-switched” monobenzo-21-crown-7 (Cr) analogues with a dithiol group at α, ω-positions (Crred) and a disulfide bond in the ring (Crox) has been synthesized. The interconversion between these two forms was effected by treatment with redox reagents. It was found that the oxidation process (Crred→ Crox) is remarkably subject to the metal template effect: the oxidation of Crred in the absence of the template gave the polymeric products (MW > 2000, 66%) in addition to Crox(5.2%), cyclic dimer (15%), and cyclic trimer (3.6%), whereas the main products in the presence of Cs+were Crox (70%) and cyclic dimer (28%) and no polymeric material was detected. The polymeric products yielded in the absence of the template depolymerized slowly to the cyclic products. Also interesting is the finding that the “kinetic” template effect is observed for the oxidation process: the pseudo-first-order rate constants for the oxidation of Crred by 3-methyllumiflavin are significantly enhanced with increase in the concentrations of Rb+ and Cs+. Such a rate increase could not be found for the oxidation of 1, 4-butanedithiol by 3-methyllumiflavin. The results of solvent extraction and evaluation of the association constants (K) established that (i) Crox has the highest selectivity for Cs+, as has Cr, (ii) the Ex% (and K) of Crox is smaller than that of Cr, and (iii) most importantly, Crredscarcely binds alkali metal cations. In ion transport across a liquid (CHC13) membrane, Crox carried Cs+6.2 times faster than Crred. Thus, it was demonstrated that the rate of Cs+transport can be regulated by the interconversion between Crred and Crox in the membrane phase. This is a new method to control the membrane transport rates by a redox-switch.

元の言語英語
ページ(範囲)3950-3955
ページ数6
ジャーナルJournal of the American Chemical Society
107
発行部数13
DOI
出版物ステータス出版済み - 1 1 1985
外部発表Yes

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Crown Ethers
Crown ethers
Disulfides
Oxidation-Reduction
Membranes
Oxidation
Alkali Metals
Dimers
Ion Transport
Cations
Metals
Liquid membranes
Alkali metals
Solvent extraction
Rate constants
Positive ions
Switches
dithiol
Association reactions
Ions

All Science Journal Classification (ASJC) codes

  • Catalysis
  • Chemistry(all)
  • Biochemistry
  • Colloid and Surface Chemistry

これを引用

Redox-Switched Crown Ethers. 3. Cyclic-Acyclic Interconversion Coupled with Redox between Dithiol and Disulfide and Its Application to Membrane Transport. / Shinkai, Seiji; Inuzuka, Kenichi; Miyazaki, Osamu; Manabe, Osamu.

:: Journal of the American Chemical Society, 巻 107, 番号 13, 01.01.1985, p. 3950-3955.

研究成果: ジャーナルへの寄稿記事

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title = "Redox-Switched Crown Ethers. 3. Cyclic-Acyclic Interconversion Coupled with Redox between Dithiol and Disulfide and Its Application to Membrane Transport",
abstract = "A pair of “redox-switched” monobenzo-21-crown-7 (Cr) analogues with a dithiol group at α, ω-positions (Crred) and a disulfide bond in the ring (Crox) has been synthesized. The interconversion between these two forms was effected by treatment with redox reagents. It was found that the oxidation process (Crred→ Crox) is remarkably subject to the metal template effect: the oxidation of Crred in the absence of the template gave the polymeric products (MW > 2000, 66{\%}) in addition to Crox(5.2{\%}), cyclic dimer (15{\%}), and cyclic trimer (3.6{\%}), whereas the main products in the presence of Cs+were Crox (70{\%}) and cyclic dimer (28{\%}) and no polymeric material was detected. The polymeric products yielded in the absence of the template depolymerized slowly to the cyclic products. Also interesting is the finding that the “kinetic” template effect is observed for the oxidation process: the pseudo-first-order rate constants for the oxidation of Crred by 3-methyllumiflavin are significantly enhanced with increase in the concentrations of Rb+ and Cs+. Such a rate increase could not be found for the oxidation of 1, 4-butanedithiol by 3-methyllumiflavin. The results of solvent extraction and evaluation of the association constants (K) established that (i) Crox has the highest selectivity for Cs+, as has Cr, (ii) the Ex{\%} (and K) of Crox is smaller than that of Cr, and (iii) most importantly, Crredscarcely binds alkali metal cations. In ion transport across a liquid (CHC13) membrane, Crox carried Cs+6.2 times faster than Crred. Thus, it was demonstrated that the rate of Cs+transport can be regulated by the interconversion between Crred and Crox in the membrane phase. This is a new method to control the membrane transport rates by a redox-switch.",
author = "Seiji Shinkai and Kenichi Inuzuka and Osamu Miyazaki and Osamu Manabe",
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T1 - Redox-Switched Crown Ethers. 3. Cyclic-Acyclic Interconversion Coupled with Redox between Dithiol and Disulfide and Its Application to Membrane Transport

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N2 - A pair of “redox-switched” monobenzo-21-crown-7 (Cr) analogues with a dithiol group at α, ω-positions (Crred) and a disulfide bond in the ring (Crox) has been synthesized. The interconversion between these two forms was effected by treatment with redox reagents. It was found that the oxidation process (Crred→ Crox) is remarkably subject to the metal template effect: the oxidation of Crred in the absence of the template gave the polymeric products (MW > 2000, 66%) in addition to Crox(5.2%), cyclic dimer (15%), and cyclic trimer (3.6%), whereas the main products in the presence of Cs+were Crox (70%) and cyclic dimer (28%) and no polymeric material was detected. The polymeric products yielded in the absence of the template depolymerized slowly to the cyclic products. Also interesting is the finding that the “kinetic” template effect is observed for the oxidation process: the pseudo-first-order rate constants for the oxidation of Crred by 3-methyllumiflavin are significantly enhanced with increase in the concentrations of Rb+ and Cs+. Such a rate increase could not be found for the oxidation of 1, 4-butanedithiol by 3-methyllumiflavin. The results of solvent extraction and evaluation of the association constants (K) established that (i) Crox has the highest selectivity for Cs+, as has Cr, (ii) the Ex% (and K) of Crox is smaller than that of Cr, and (iii) most importantly, Crredscarcely binds alkali metal cations. In ion transport across a liquid (CHC13) membrane, Crox carried Cs+6.2 times faster than Crred. Thus, it was demonstrated that the rate of Cs+transport can be regulated by the interconversion between Crred and Crox in the membrane phase. This is a new method to control the membrane transport rates by a redox-switch.

AB - A pair of “redox-switched” monobenzo-21-crown-7 (Cr) analogues with a dithiol group at α, ω-positions (Crred) and a disulfide bond in the ring (Crox) has been synthesized. The interconversion between these two forms was effected by treatment with redox reagents. It was found that the oxidation process (Crred→ Crox) is remarkably subject to the metal template effect: the oxidation of Crred in the absence of the template gave the polymeric products (MW > 2000, 66%) in addition to Crox(5.2%), cyclic dimer (15%), and cyclic trimer (3.6%), whereas the main products in the presence of Cs+were Crox (70%) and cyclic dimer (28%) and no polymeric material was detected. The polymeric products yielded in the absence of the template depolymerized slowly to the cyclic products. Also interesting is the finding that the “kinetic” template effect is observed for the oxidation process: the pseudo-first-order rate constants for the oxidation of Crred by 3-methyllumiflavin are significantly enhanced with increase in the concentrations of Rb+ and Cs+. Such a rate increase could not be found for the oxidation of 1, 4-butanedithiol by 3-methyllumiflavin. The results of solvent extraction and evaluation of the association constants (K) established that (i) Crox has the highest selectivity for Cs+, as has Cr, (ii) the Ex% (and K) of Crox is smaller than that of Cr, and (iii) most importantly, Crredscarcely binds alkali metal cations. In ion transport across a liquid (CHC13) membrane, Crox carried Cs+6.2 times faster than Crred. Thus, it was demonstrated that the rate of Cs+transport can be regulated by the interconversion between Crred and Crox in the membrane phase. This is a new method to control the membrane transport rates by a redox-switch.

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