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

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  • ARIMURA Takashi
    Nanotechnology Research Institute, National Institute of Advanced Industrial Science and Technology (AIST)
  • NISHIOKA Takuya
    Nanotechnology Research Institute, National Institute of Advanced Industrial Science and Technology (AIST)
  • KUMAMOTO Satoshi
    Nanotechnology Research Institute, National Institute of Advanced Industrial Science and Technology (AIST)
  • TSUCHIYA Youichi
    Nanotechnology Research Institute, National Institute of Advanced Industrial Science and Technology (AIST)
  • YAMAGUCHI Tomohiko
    Nanotechnology Research Institute, National Institute of Advanced Industrial Science and Technology (AIST)
  • TACHIYA M.
    Fellow, National Institute of Advanced Industrial Science and Technology (AIST)

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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.<br>

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