Synthesis and crystal structures of gallium- and germanium-variants of the fibrous zeolites with the NAT, EDI and THO structure types

Yongjae Lee, Sun Jin Kim, John B. Parise

Research output: Contribution to journalArticle

21 Citations (Scopus)

Abstract

Two synthetic gallosilicates and a gallogermanate with the NAT, EDI and THO framework topologies have been synthesized under hydrothermal conditions and characterized by single crystal synchrotron X-ray diffraction. K-GaSi-NAT, K8Ga8Si12O40 · 6H2O, is tetragonal, space group I42d, with a = 13.639(2), c = 6.545(1) Å. The framework model shows complete disordering of Ga and Si in tetrahedral sites, which is analogous to tetranatrolite but contrasts with the partial ordering in Na-GaSi-NAT. The T-sites of RbNa-GaSi-EDI, Rb7NaGa8Si12O40 · 3H2O, exhibit partial disordering of Ga and Si in space group P421c. This leads to a cell doubling along the chain axis (c) with a = 9.773(1), c = 13.141(3) Å, a super cell modification of the Na-exchanged K-F structure. In Rb-GaGe-THO, Rb20Ga20Ge20O80 · 15H2O, a = 14.335(3), b = 14.198(3), c = 13.421(3) Å, complete ordering on both tetrahedral and extra-framework sites lowers the symmetry from Pncn to the acentric space group Pn2n. An inspection of framework T-O-T bond angles, which are related to rotation and distortion of the chains, explains the differences in unit cells between these gallium- and germanium-variants and aluminosilicate analogs. The elliptical 8-ring windows, generated by four crosslinked chains in RbNa-GaSi-EDI and Rb-GaGe-THO, are the sites for (Rb, Na) and Rb cations, respectively, while the helical 8-ring channels formed in K-GaSi-NAT host only water molecules. The T10O20 windows, built by two neighboring chains, provide sites for K or Rb cations in each model. Mechanisms are proposed for cation-framework interactions, which are in turn responsible for the observed framework models. (C) 2000 Elsevier Science B.V. All rights reserved.

Original languageEnglish
Pages (from-to)255-271
Number of pages17
JournalMicroporous and Mesoporous Materials
Volume34
Issue number3
DOIs
Publication statusPublished - 2000 Mar 1

Fingerprint

Germanium
Zeolites
Gallium
Electronic data interchange
zeolites
gallium
germanium
Crystal structure
Positive ions
Cations
crystal structure
Gages
synthesis
cations
Aluminosilicates
cells
Synchrotrons
rings
Inspection
Topology

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials

Cite this

@article{8ef4963d243f4e629d7cd41157c25135,
title = "Synthesis and crystal structures of gallium- and germanium-variants of the fibrous zeolites with the NAT, EDI and THO structure types",
abstract = "Two synthetic gallosilicates and a gallogermanate with the NAT, EDI and THO framework topologies have been synthesized under hydrothermal conditions and characterized by single crystal synchrotron X-ray diffraction. K-GaSi-NAT, K8Ga8Si12O40 · 6H2O, is tetragonal, space group I42d, with a = 13.639(2), c = 6.545(1) {\AA}. The framework model shows complete disordering of Ga and Si in tetrahedral sites, which is analogous to tetranatrolite but contrasts with the partial ordering in Na-GaSi-NAT. The T-sites of RbNa-GaSi-EDI, Rb7NaGa8Si12O40 · 3H2O, exhibit partial disordering of Ga and Si in space group P421c. This leads to a cell doubling along the chain axis (c) with a = 9.773(1), c = 13.141(3) {\AA}, a super cell modification of the Na-exchanged K-F structure. In Rb-GaGe-THO, Rb20Ga20Ge20O80 · 15H2O, a = 14.335(3), b = 14.198(3), c = 13.421(3) {\AA}, complete ordering on both tetrahedral and extra-framework sites lowers the symmetry from Pncn to the acentric space group Pn2n. An inspection of framework T-O-T bond angles, which are related to rotation and distortion of the chains, explains the differences in unit cells between these gallium- and germanium-variants and aluminosilicate analogs. The elliptical 8-ring windows, generated by four crosslinked chains in RbNa-GaSi-EDI and Rb-GaGe-THO, are the sites for (Rb, Na) and Rb cations, respectively, while the helical 8-ring channels formed in K-GaSi-NAT host only water molecules. The T10O20 windows, built by two neighboring chains, provide sites for K or Rb cations in each model. Mechanisms are proposed for cation-framework interactions, which are in turn responsible for the observed framework models. (C) 2000 Elsevier Science B.V. All rights reserved.",
author = "Yongjae Lee and Kim, {Sun Jin} and Parise, {John B.}",
year = "2000",
month = "3",
day = "1",
doi = "10.1016/S1387-1811(99)00176-6",
language = "English",
volume = "34",
pages = "255--271",
journal = "Microporous and Mesoporous Materials",
issn = "1387-1811",
publisher = "Elsevier",
number = "3",

}

Synthesis and crystal structures of gallium- and germanium-variants of the fibrous zeolites with the NAT, EDI and THO structure types. / Lee, Yongjae; Kim, Sun Jin; Parise, John B.

In: Microporous and Mesoporous Materials, Vol. 34, No. 3, 01.03.2000, p. 255-271.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Synthesis and crystal structures of gallium- and germanium-variants of the fibrous zeolites with the NAT, EDI and THO structure types

AU - Lee, Yongjae

AU - Kim, Sun Jin

AU - Parise, John B.

PY - 2000/3/1

Y1 - 2000/3/1

N2 - Two synthetic gallosilicates and a gallogermanate with the NAT, EDI and THO framework topologies have been synthesized under hydrothermal conditions and characterized by single crystal synchrotron X-ray diffraction. K-GaSi-NAT, K8Ga8Si12O40 · 6H2O, is tetragonal, space group I42d, with a = 13.639(2), c = 6.545(1) Å. The framework model shows complete disordering of Ga and Si in tetrahedral sites, which is analogous to tetranatrolite but contrasts with the partial ordering in Na-GaSi-NAT. The T-sites of RbNa-GaSi-EDI, Rb7NaGa8Si12O40 · 3H2O, exhibit partial disordering of Ga and Si in space group P421c. This leads to a cell doubling along the chain axis (c) with a = 9.773(1), c = 13.141(3) Å, a super cell modification of the Na-exchanged K-F structure. In Rb-GaGe-THO, Rb20Ga20Ge20O80 · 15H2O, a = 14.335(3), b = 14.198(3), c = 13.421(3) Å, complete ordering on both tetrahedral and extra-framework sites lowers the symmetry from Pncn to the acentric space group Pn2n. An inspection of framework T-O-T bond angles, which are related to rotation and distortion of the chains, explains the differences in unit cells between these gallium- and germanium-variants and aluminosilicate analogs. The elliptical 8-ring windows, generated by four crosslinked chains in RbNa-GaSi-EDI and Rb-GaGe-THO, are the sites for (Rb, Na) and Rb cations, respectively, while the helical 8-ring channels formed in K-GaSi-NAT host only water molecules. The T10O20 windows, built by two neighboring chains, provide sites for K or Rb cations in each model. Mechanisms are proposed for cation-framework interactions, which are in turn responsible for the observed framework models. (C) 2000 Elsevier Science B.V. All rights reserved.

AB - Two synthetic gallosilicates and a gallogermanate with the NAT, EDI and THO framework topologies have been synthesized under hydrothermal conditions and characterized by single crystal synchrotron X-ray diffraction. K-GaSi-NAT, K8Ga8Si12O40 · 6H2O, is tetragonal, space group I42d, with a = 13.639(2), c = 6.545(1) Å. The framework model shows complete disordering of Ga and Si in tetrahedral sites, which is analogous to tetranatrolite but contrasts with the partial ordering in Na-GaSi-NAT. The T-sites of RbNa-GaSi-EDI, Rb7NaGa8Si12O40 · 3H2O, exhibit partial disordering of Ga and Si in space group P421c. This leads to a cell doubling along the chain axis (c) with a = 9.773(1), c = 13.141(3) Å, a super cell modification of the Na-exchanged K-F structure. In Rb-GaGe-THO, Rb20Ga20Ge20O80 · 15H2O, a = 14.335(3), b = 14.198(3), c = 13.421(3) Å, complete ordering on both tetrahedral and extra-framework sites lowers the symmetry from Pncn to the acentric space group Pn2n. An inspection of framework T-O-T bond angles, which are related to rotation and distortion of the chains, explains the differences in unit cells between these gallium- and germanium-variants and aluminosilicate analogs. The elliptical 8-ring windows, generated by four crosslinked chains in RbNa-GaSi-EDI and Rb-GaGe-THO, are the sites for (Rb, Na) and Rb cations, respectively, while the helical 8-ring channels formed in K-GaSi-NAT host only water molecules. The T10O20 windows, built by two neighboring chains, provide sites for K or Rb cations in each model. Mechanisms are proposed for cation-framework interactions, which are in turn responsible for the observed framework models. (C) 2000 Elsevier Science B.V. All rights reserved.

UR - http://www.scopus.com/inward/record.url?scp=0034113143&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0034113143&partnerID=8YFLogxK

U2 - 10.1016/S1387-1811(99)00176-6

DO - 10.1016/S1387-1811(99)00176-6

M3 - Article

AN - SCOPUS:0034113143

VL - 34

SP - 255

EP - 271

JO - Microporous and Mesoporous Materials

JF - Microporous and Mesoporous Materials

SN - 1387-1811

IS - 3

ER -