Study of the Aluminophosphates A1P04-21 and AlP04-25 by 27Al Double-Rotation NMR

R. Jelinek; B. F. Chmelka; Y. Wu; P. J. Grandinetti; A. Pines; P. J. Barrie; J. Klinowsk

doi:10.1021/ja00011a007

Study of the Aluminophosphates A1P0₄-21 and AlP0₄-25 by ²⁷Al Double-Rotation NMR

R. Jelinek, B. F. Chmelka, Y. Wu, P. J. Grandinetti, A. Pines, P. J. Barrie, J. Klinowsk

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Abstract

Aluminum-27 double-rotation NMR in a magnetic field of 11.7? distinguishes the extremely distorted five-coordinated aluminum sites in the molecular sieve precursor A1P0₄-21. Upon calcination, A1P0₄-21 transforms to AlP0₄-25, which has two tetrahedral aluminum sites with similar isotropic chemical shifts that cannot be resolved in an 11.7? field. The two tetrahedral environments, however, have different quadrupole coupling constants and are distinguished by double rotation at 4.2? field. The quadrupole coupling constants obtained for these sites indicate that the tetrahedral aluminum environments are less distorted in the hydrated material.

Original language	English
Pages (from-to)	4097-4101
Number of pages	5
Journal	Journal of the American Chemical Society
Volume	113
Issue number	11
DOIs	https://doi.org/10.1021/ja00011a007
State	Published - 1 May 1991
Externally published	Yes

ASJC Scopus subject areas

Catalysis
Chemistry (all)
Biochemistry
Colloid and Surface Chemistry

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title = "Study of the Aluminophosphates A1P04-21 and AlP04-25 by 27Al Double-Rotation NMR",

abstract = "Aluminum-27 double-rotation NMR in a magnetic field of 11.7? distinguishes the extremely distorted five-coordinated aluminum sites in the molecular sieve precursor A1P04-21. Upon calcination, A1P04-21 transforms to AlP04-25, which has two tetrahedral aluminum sites with similar isotropic chemical shifts that cannot be resolved in an 11.7? field. The two tetrahedral environments, however, have different quadrupole coupling constants and are distinguished by double rotation at 4.2? field. The quadrupole coupling constants obtained for these sites indicate that the tetrahedral aluminum environments are less distorted in the hydrated material.",

author = "R. Jelinek and Chmelka, {B. F.} and Y. Wu and Grandinetti, {P. J.} and A. Pines and Barrie, {P. J.} and J. Klinowsk",

year = "1991",

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T1 - Study of the Aluminophosphates A1P04-21 and AlP04-25 by 27Al Double-Rotation NMR

AU - Jelinek, R.

AU - Chmelka, B. F.

AU - Wu, Y.

AU - Grandinetti, P. J.

AU - Pines, A.

AU - Barrie, P. J.

AU - Klinowsk, J.

PY - 1991/5/1

Y1 - 1991/5/1

N2 - Aluminum-27 double-rotation NMR in a magnetic field of 11.7? distinguishes the extremely distorted five-coordinated aluminum sites in the molecular sieve precursor A1P04-21. Upon calcination, A1P04-21 transforms to AlP04-25, which has two tetrahedral aluminum sites with similar isotropic chemical shifts that cannot be resolved in an 11.7? field. The two tetrahedral environments, however, have different quadrupole coupling constants and are distinguished by double rotation at 4.2? field. The quadrupole coupling constants obtained for these sites indicate that the tetrahedral aluminum environments are less distorted in the hydrated material.

AB - Aluminum-27 double-rotation NMR in a magnetic field of 11.7? distinguishes the extremely distorted five-coordinated aluminum sites in the molecular sieve precursor A1P04-21. Upon calcination, A1P04-21 transforms to AlP04-25, which has two tetrahedral aluminum sites with similar isotropic chemical shifts that cannot be resolved in an 11.7? field. The two tetrahedral environments, however, have different quadrupole coupling constants and are distinguished by double rotation at 4.2? field. The quadrupole coupling constants obtained for these sites indicate that the tetrahedral aluminum environments are less distorted in the hydrated material.

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Study of the Aluminophosphates A1P0₄-21 and AlP0₄-25 by ²⁷Al Double-Rotation NMR

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