Carbon-13 NMR Longitudinal Relaxation Time Study of an Ionophoric 1,3-Alternate-Shaped Calix[4]arene Ester

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

doi:10.5650/jos.55.75

Carbon-13 NMR Longitudinal Relaxation Time Study of an Ionophoric 1,3-Alternate-Shaped Calix[4]arene Ester

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

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

Abstract

The carbon-13 NMR longitudinal relaxation times (T₁) studies on the 1,3-alternate-shaped calix[4]arene possessing two ester groups 1 in the absence and the presence of Na⁺ were carried out for the first time. The T₁ values were measured under proton-noise-decoupling conditions by the inversion-recovery technique. The T₁-value of 1 is primarily governed by dipole-dipole relaxation. When calixarene 1 forms an ensemble with Na, the T₁-values for all carbons are decreased. This suggests that the molecular motion of species 1 is efficiently frozen through complexation with Na⁺. Eventually, Na⁺ ion plays an important role as a template ion specifically to freeze the fluctuational motion of two ethoxycarbonylmethoxybenzene units of 1.

Original language	English
Pages (from-to)	75-78
Number of pages	4
Journal	Journal of oleo science
Volume	55
Issue number	2
DOIs	https://doi.org/10.5650/jos.55.75
Publication status	Published - 2006
Externally published	Yes

All Science Journal Classification (ASJC) codes

Chemistry(all)
Chemical Engineering(all)

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title = "Carbon-13 NMR Longitudinal Relaxation Time Study of an Ionophoric 1,3-Alternate-Shaped Calix[4]arene Ester",

abstract = "The carbon-13 NMR longitudinal relaxation times (T1) studies on the 1,3-alternate-shaped calix[4]arene possessing two ester groups 1 in the absence and the presence of Na+ were carried out for the first time. The T1 values were measured under proton-noise-decoupling conditions by the inversion-recovery technique. The T1-value of 1 is primarily governed by dipole-dipole relaxation. When calixarene 1 forms an ensemble with Na, the T1-values for all carbons are decreased. This suggests that the molecular motion of species 1 is efficiently frozen through complexation with Na+. Eventually, Na+ ion plays an important role as a template ion specifically to freeze the fluctuational motion of two ethoxycarbonylmethoxybenzene units of 1.",

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

year = "2006",

doi = "10.5650/jos.55.75",

language = "English",

volume = "55",

pages = "75--78",

journal = "Journal of Oleo Science",

issn = "1345-8957",

publisher = "Japan Oil Chemists Society",

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T1 - Carbon-13 NMR Longitudinal Relaxation Time Study of an Ionophoric 1,3-Alternate-Shaped Calix[4]arene Ester

AU - Arimura, Takashi

AU - Nishioka, Takuya

AU - Kumamoto, Satoshi

AU - Tsuchiya, Youichi

AU - Yamaguchi, Tomohiko

AU - Tachiya, M.

PY - 2006

Y1 - 2006

N2 - The carbon-13 NMR longitudinal relaxation times (T1) studies on the 1,3-alternate-shaped calix[4]arene possessing two ester groups 1 in the absence and the presence of Na+ were carried out for the first time. The T1 values were measured under proton-noise-decoupling conditions by the inversion-recovery technique. The T1-value of 1 is primarily governed by dipole-dipole relaxation. When calixarene 1 forms an ensemble with Na, the T1-values for all carbons are decreased. This suggests that the molecular motion of species 1 is efficiently frozen through complexation with Na+. Eventually, Na+ ion plays an important role as a template ion specifically to freeze the fluctuational motion of two ethoxycarbonylmethoxybenzene units of 1.

AB - The carbon-13 NMR longitudinal relaxation times (T1) studies on the 1,3-alternate-shaped calix[4]arene possessing two ester groups 1 in the absence and the presence of Na+ were carried out for the first time. The T1 values were measured under proton-noise-decoupling conditions by the inversion-recovery technique. The T1-value of 1 is primarily governed by dipole-dipole relaxation. When calixarene 1 forms an ensemble with Na, the T1-values for all carbons are decreased. This suggests that the molecular motion of species 1 is efficiently frozen through complexation with Na+. Eventually, Na+ ion plays an important role as a template ion specifically to freeze the fluctuational motion of two ethoxycarbonylmethoxybenzene units of 1.

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Carbon-13 NMR Longitudinal Relaxation Time Study of an Ionophoric 1,3-Alternate-Shaped Calix[4]arene Ester

Abstract

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