Slow Intermolecular Complexation–Decomplexation Exchanges of Cyclodextrins in Fullerene and Its Derivative Complexes

Atsushi Ikeda, Tomoya Mae, Kouta Sugikawa, Kenji Komaguchi, Toshifumi Konishi, Takehiro Hirao, Takeharu Haino

研究成果: Article

2 引用 (Scopus)

抄録

Fullerenes (C60 and C70) and several functionalized C60 derivatives can be encapsulated in two γ-cyclodextrins (γ-CDxs). Although intermolecular complexation–decomplexation exchange of γ-CDx is known to be very slow, the exchange rates have yet to be quantitatively measured. Herein, we determined that the pseudo-first-order association and dissociation rate constants for the γ-CDx2•C70 complex were 4.3 and 0.6 s−1 at 23 °C, respectively. In contrast, the intermolecular exchange rates for the γ-CDx2•C60 and C60 derivative complexes were slower than the time scale of exchange spectroscopy NMR experiments and the exchange rate constants were in the order of 10−4 s−1. Furthermore, a γ-CDx2•C60 derivative complex was shown to have different intermolecular exchange rates for the two γ-CDxs depending on steric hindrance from the substituent on the C60 derivative.

元の言語English
ページ(範囲)11322-11327
ページ数6
ジャーナルChemistrySelect
2
発行部数34
DOI
出版物ステータスPublished - 2017 1 1

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Fullerenes
Cyclodextrins
Derivatives
Rate constants
Nuclear magnetic resonance spectroscopy
Association reactions
Experiments

ASJC Scopus subject areas

  • Chemistry(all)

これを引用

Slow Intermolecular Complexation–Decomplexation Exchanges of Cyclodextrins in Fullerene and Its Derivative Complexes. / Ikeda, Atsushi; Mae, Tomoya; Sugikawa, Kouta; Komaguchi, Kenji; Konishi, Toshifumi; Hirao, Takehiro; Haino, Takeharu.

:: ChemistrySelect, 巻 2, 番号 34, 01.01.2017, p. 11322-11327.

研究成果: Article

Ikeda, Atsushi ; Mae, Tomoya ; Sugikawa, Kouta ; Komaguchi, Kenji ; Konishi, Toshifumi ; Hirao, Takehiro ; Haino, Takeharu. / Slow Intermolecular Complexation–Decomplexation Exchanges of Cyclodextrins in Fullerene and Its Derivative Complexes. :: ChemistrySelect. 2017 ; 巻 2, 番号 34. pp. 11322-11327.
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AU - Komaguchi, Kenji

AU - Konishi, Toshifumi

AU - Hirao, Takehiro

AU - Haino, Takeharu

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N2 - Fullerenes (C60 and C70) and several functionalized C60 derivatives can be encapsulated in two γ-cyclodextrins (γ-CDxs). Although intermolecular complexation–decomplexation exchange of γ-CDx is known to be very slow, the exchange rates have yet to be quantitatively measured. Herein, we determined that the pseudo-first-order association and dissociation rate constants for the γ-CDx2•C70 complex were 4.3 and 0.6 s−1 at 23 °C, respectively. In contrast, the intermolecular exchange rates for the γ-CDx2•C60 and C60 derivative complexes were slower than the time scale of exchange spectroscopy NMR experiments and the exchange rate constants were in the order of 10−4 s−1. Furthermore, a γ-CDx2•C60 derivative complex was shown to have different intermolecular exchange rates for the two γ-CDxs depending on steric hindrance from the substituent on the C60 derivative.

AB - Fullerenes (C60 and C70) and several functionalized C60 derivatives can be encapsulated in two γ-cyclodextrins (γ-CDxs). Although intermolecular complexation–decomplexation exchange of γ-CDx is known to be very slow, the exchange rates have yet to be quantitatively measured. Herein, we determined that the pseudo-first-order association and dissociation rate constants for the γ-CDx2•C70 complex were 4.3 and 0.6 s−1 at 23 °C, respectively. In contrast, the intermolecular exchange rates for the γ-CDx2•C60 and C60 derivative complexes were slower than the time scale of exchange spectroscopy NMR experiments and the exchange rate constants were in the order of 10−4 s−1. Furthermore, a γ-CDx2•C60 derivative complex was shown to have different intermolecular exchange rates for the two γ-CDxs depending on steric hindrance from the substituent on the C60 derivative.

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