An NMR study on the dynamic behavior of triethylamine included in AFI crystals - Influence of acid sites on the motional state of triethylamine molecules

Kazuma Gotoh, Shin'ichi Ishimaru, Ryuichi Ikeda

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Abstract

The 1H NMR spin-lattice relaxation times (T1) of triethylamine (TEA) molecules included in five kinds of AFI crystals with different concentrations of Si atoms in the wall were measured. The temperature and Larmor frequency dependences of T1 were well explained by introducing a distributed motional correlation time (τ) for the pseudo-C3 TEA reorientation. An obtained linear decrease in the τ distribution width with an increase of the Si concentration, i.e., the number of Brønsted acid sites, was shown to be related to the orientations of TEA molecules in channels.

Original languageEnglish
Pages (from-to)1723-1727
Number of pages5
JournalBulletin of the Chemical Society of Japan
Volume76
Issue number9
DOIs
Publication statusPublished - 2003
Externally publishedYes

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Nuclear magnetic resonance
Crystals
Molecules
Acids
Spin-lattice relaxation
Relaxation time
Atoms
triethylamine
Temperature

ASJC Scopus subject areas

  • Chemistry(all)

Cite this

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abstract = "The 1H NMR spin-lattice relaxation times (T1) of triethylamine (TEA) molecules included in five kinds of AFI crystals with different concentrations of Si atoms in the wall were measured. The temperature and Larmor frequency dependences of T1 were well explained by introducing a distributed motional correlation time (τ) for the pseudo-C3 TEA reorientation. An obtained linear decrease in the τ distribution width with an increase of the Si concentration, i.e., the number of Br{\o}nsted acid sites, was shown to be related to the orientations of TEA molecules in channels.",
author = "Kazuma Gotoh and Shin'ichi Ishimaru and Ryuichi Ikeda",
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T1 - An NMR study on the dynamic behavior of triethylamine included in AFI crystals - Influence of acid sites on the motional state of triethylamine molecules

AU - Gotoh, Kazuma

AU - Ishimaru, Shin'ichi

AU - Ikeda, Ryuichi

PY - 2003

Y1 - 2003

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AB - The 1H NMR spin-lattice relaxation times (T1) of triethylamine (TEA) molecules included in five kinds of AFI crystals with different concentrations of Si atoms in the wall were measured. The temperature and Larmor frequency dependences of T1 were well explained by introducing a distributed motional correlation time (τ) for the pseudo-C3 TEA reorientation. An obtained linear decrease in the τ distribution width with an increase of the Si concentration, i.e., the number of Brønsted acid sites, was shown to be related to the orientations of TEA molecules in channels.

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