Dynamic behaviour of triethylamine molecules adsorbed in aluminophosphate (AlPO4-5) and silicoaluminophosphate (SAPO-5) molecular sieves

Kazuma Gotoh; Shin'ichi Ishimaru; Ryuichi Ikeda

doi:10.1039/a908962d

Dynamic behaviour of triethylamine molecules adsorbed in aluminophosphate (AlPO₄-5) and silicoaluminophosphate (SAPO-5) molecular sieves

Kazuma Gotoh, Shin'ichi Ishimaru, Ryuichi Ikeda

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

6 Citations (Scopus)

Abstract

¹H NMR spectra, second moments of line and spin-lattice relaxation times were measured for triethylamine (TEA) adsorbed in aluminophosphate (AlPO₄-5) and silicoaluminophosphate (SAPO-5) molecular sieves in the temperature range 90 K to room temperature. Two modes of motions, molecular reorientations about the pseudo-C₃ axis and the isotropic rotation were observed in both systems. The fact that the former motion in SAPO-5 is hindered more than in AlPO₄-5 was attributed to the hydrogen-bond formation between Bronsted acid sites and lone-pair electrons in TEA. This difference in interaction was shown to be the origin of the distribution of the motional correlation time (τ) in SAPO-5 less than in AlPO₄-5 in which the presence of molecular C₃ axes in micropores oriented more randomly than in SAPO-5 result in a marked τ distribution.

Original language	English
Pages (from-to)	1865-1869
Number of pages	5
Journal	Physical Chemistry Chemical Physics
Volume	2
Issue number	8
DOIs	https://doi.org/10.1039/a908962d
Publication status	Published - Apr 15 2000
Externally published	Yes

ASJC Scopus subject areas

Physics and Astronomy(all)
Physical and Theoretical Chemistry

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title = "Dynamic behaviour of triethylamine molecules adsorbed in aluminophosphate (AlPO4-5) and silicoaluminophosphate (SAPO-5) molecular sieves",

abstract = "1H NMR spectra, second moments of line and spin-lattice relaxation times were measured for triethylamine (TEA) adsorbed in aluminophosphate (AlPO4-5) and silicoaluminophosphate (SAPO-5) molecular sieves in the temperature range 90 K to room temperature. Two modes of motions, molecular reorientations about the pseudo-C3 axis and the isotropic rotation were observed in both systems. The fact that the former motion in SAPO-5 is hindered more than in AlPO4-5 was attributed to the hydrogen-bond formation between Bronsted acid sites and lone-pair electrons in TEA. This difference in interaction was shown to be the origin of the distribution of the motional correlation time (τ) in SAPO-5 less than in AlPO4-5 in which the presence of molecular C3 axes in micropores oriented more randomly than in SAPO-5 result in a marked τ distribution.",

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T1 - Dynamic behaviour of triethylamine molecules adsorbed in aluminophosphate (AlPO4-5) and silicoaluminophosphate (SAPO-5) molecular sieves

AU - Gotoh, Kazuma

AU - Ishimaru, Shin'ichi

AU - Ikeda, Ryuichi

PY - 2000/4/15

Y1 - 2000/4/15

N2 - 1H NMR spectra, second moments of line and spin-lattice relaxation times were measured for triethylamine (TEA) adsorbed in aluminophosphate (AlPO4-5) and silicoaluminophosphate (SAPO-5) molecular sieves in the temperature range 90 K to room temperature. Two modes of motions, molecular reorientations about the pseudo-C3 axis and the isotropic rotation were observed in both systems. The fact that the former motion in SAPO-5 is hindered more than in AlPO4-5 was attributed to the hydrogen-bond formation between Bronsted acid sites and lone-pair electrons in TEA. This difference in interaction was shown to be the origin of the distribution of the motional correlation time (τ) in SAPO-5 less than in AlPO4-5 in which the presence of molecular C3 axes in micropores oriented more randomly than in SAPO-5 result in a marked τ distribution.

AB - 1H NMR spectra, second moments of line and spin-lattice relaxation times were measured for triethylamine (TEA) adsorbed in aluminophosphate (AlPO4-5) and silicoaluminophosphate (SAPO-5) molecular sieves in the temperature range 90 K to room temperature. Two modes of motions, molecular reorientations about the pseudo-C3 axis and the isotropic rotation were observed in both systems. The fact that the former motion in SAPO-5 is hindered more than in AlPO4-5 was attributed to the hydrogen-bond formation between Bronsted acid sites and lone-pair electrons in TEA. This difference in interaction was shown to be the origin of the distribution of the motional correlation time (τ) in SAPO-5 less than in AlPO4-5 in which the presence of molecular C3 axes in micropores oriented more randomly than in SAPO-5 result in a marked τ distribution.

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Dynamic behaviour of triethylamine molecules adsorbed in aluminophosphate (AlPO₄-5) and silicoaluminophosphate (SAPO-5) molecular sieves

Abstract

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