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 journalArticlepeer-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 languageEnglish
Pages (from-to)75-78
Number of pages4
JournalJournal of oleo science
Volume55
Issue number2
DOIs
Publication statusPublished - 2006
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Chemical Engineering(all)

Fingerprint Dive into the research topics of 'Carbon-13 NMR Longitudinal Relaxation Time Study of an Ionophoric 1,3-Alternate-Shaped Calix[4]arene Ester'. Together they form a unique fingerprint.

Cite this