TY - JOUR
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 - 2003/9/1
Y1 - 2003/9/1
N2 - 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.
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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U2 - 10.1246/bcsj.76.1723
DO - 10.1246/bcsj.76.1723
M3 - Article
AN - SCOPUS:0141483199
SN - 0009-2673
VL - 76
SP - 1723
EP - 1727
JO - Bulletin of the Chemical Society of Japan
JF - Bulletin of the Chemical Society of Japan
IS - 9
ER -