Sodium-23 NMR Studies of Sodium Ion Ensembles with a 1,3-Alternate-Shaped Calix[4]arene

Takashi Arimura; Takuya Nishioka; Satoshi Kumamoto; Youichi Tsuchiya; Tomohiko Yamaguchi; M. Tachiya

doi:10.5650/jos.55.71

Sodium-23 NMR Studies of Sodium Ion Ensembles with a 1,3-Alternate-Shaped Calix[4]arene

Takashi Arimura, Takuya Nishioka, Satoshi Kumamoto, Youichi Tsuchiya, Tomohiko Yamaguchi, M. Tachiya

Research output: Contribution to journal › Article › peer-review

Abstract

Sodium-23 NMR longitudinal magnetization recovery (L.M.R.) study has been carried out to clarify the sodium ion exchange in ensembles with 1,3-alternate-shaped calix[4]arene 1 for the first time. The line width v_1/2 of a sharp singlet for NaClO₄ in the absence of 1 is 65 Hz: upon addition of 1 a singlet peak was broadened to 1100 Hz (v_1/2). The life times (τ) of Na⁺ were estimated to be (20-3.8)× 10³ s for τ_A and (5.0-2.0)× 10^-3 s for τ_B, by the simulations of sodium-23 NMR L.M.R. curves. The life times of 1-Na⁺ Ensemble are larger than those for 18-crown-6. This implies that Na⁺ cation is bound deeply in the cavity formed by two OCH₂CO groups of 1, the complex being classified as a “nest-in-type”.

Original language	English
Pages (from-to)	71-74
Number of pages	4
Journal	Journal of oleo science
Volume	55
Issue number	2
DOIs	https://doi.org/10.5650/jos.55.71
Publication status	Published - 2006
Externally published	Yes

All Science Journal Classification (ASJC) codes

Chemistry(all)
Chemical Engineering(all)

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title = "Sodium-23 NMR Studies of Sodium Ion Ensembles with a 1,3-Alternate-Shaped Calix[4]arene",

abstract = "Sodium-23 NMR longitudinal magnetization recovery (L.M.R.) study has been carried out to clarify the sodium ion exchange in ensembles with 1,3-alternate-shaped calix[4]arene 1 for the first time. The line width v1/2 of a sharp singlet for NaClO4 in the absence of 1 is 65 Hz: upon addition of 1 a singlet peak was broadened to 1100 Hz (v1/2). The life times (τ) of Na+ were estimated to be (20-3.8)× 103 s for τA and (5.0-2.0)× 10-3 s for τB, by the simulations of sodium-23 NMR L.M.R. curves. The life times of 1-Na+ Ensemble are larger than those for 18-crown-6. This implies that Na+ cation is bound deeply in the cavity formed by two OCH2CO groups of 1, the complex being classified as a “nest-in-type”.",

author = "Takashi Arimura and Takuya Nishioka and Satoshi Kumamoto and Youichi Tsuchiya and Tomohiko Yamaguchi and M. Tachiya",

year = "2006",

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AU - Arimura, Takashi

AU - Nishioka, Takuya

AU - Kumamoto, Satoshi

AU - Tsuchiya, Youichi

AU - Yamaguchi, Tomohiko

AU - Tachiya, M.

PY - 2006

Y1 - 2006

N2 - Sodium-23 NMR longitudinal magnetization recovery (L.M.R.) study has been carried out to clarify the sodium ion exchange in ensembles with 1,3-alternate-shaped calix[4]arene 1 for the first time. The line width v1/2 of a sharp singlet for NaClO4 in the absence of 1 is 65 Hz: upon addition of 1 a singlet peak was broadened to 1100 Hz (v1/2). The life times (τ) of Na+ were estimated to be (20-3.8)× 103 s for τA and (5.0-2.0)× 10-3 s for τB, by the simulations of sodium-23 NMR L.M.R. curves. The life times of 1-Na+ Ensemble are larger than those for 18-crown-6. This implies that Na+ cation is bound deeply in the cavity formed by two OCH2CO groups of 1, the complex being classified as a “nest-in-type”.

AB - Sodium-23 NMR longitudinal magnetization recovery (L.M.R.) study has been carried out to clarify the sodium ion exchange in ensembles with 1,3-alternate-shaped calix[4]arene 1 for the first time. The line width v1/2 of a sharp singlet for NaClO4 in the absence of 1 is 65 Hz: upon addition of 1 a singlet peak was broadened to 1100 Hz (v1/2). The life times (τ) of Na+ were estimated to be (20-3.8)× 103 s for τA and (5.0-2.0)× 10-3 s for τB, by the simulations of sodium-23 NMR L.M.R. curves. The life times of 1-Na+ Ensemble are larger than those for 18-crown-6. This implies that Na+ cation is bound deeply in the cavity formed by two OCH2CO groups of 1, the complex being classified as a “nest-in-type”.

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Sodium-23 NMR Studies of Sodium Ion Ensembles with a 1,3-Alternate-Shaped Calix[4]arene

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