3-dimensional methylammonium and ammonium templated lithiumberyllofluoro frameworks
3-dimensional methylammonium and ammonium templated lithiumberyllofluoro frameworks
Two three-dimensional lithiumberyllofluoride materials, of the same framework stoichiometry but different topologies, have been synthesized using hydrothermal pressure conditions and ammonium/methylammonium cations as structure-directing species. Compound I, [Li2Be2F7] [NH4], and compound II, [Li2Be2F7][CH3NH3], both crystallize in orthorhombic space groups: Pca2(1) for I and Cmcm for II. Single crystal analysis reveals that the materials have slightly different 3-D framework topologies for the [Li2Be2F7] framework composed of [LiF4] and [BeF4] tetrahedra connected through doubly and triply bridging fluorides. Both networks can be viewed as sheets formed of 3- and 4-nets that link perpendicular to the sheet, through a bridging fluoride, to form six-membered interlayer pores. The six-membered channels contain the amine species hydrogen-bonded to framework fluoride ions surrounding the interior of the pore. The thermal stability, spectroscopic properties, and both powder X-ray and neutron data of these compounds are reported, along with the single-crystal analysis used to solve the structures.
ion-exchange capacity, crystal-structure, hydrothermal synthesis, molecular-sieves, phosphates, lithium, aluminophosphate, zeolite, catalyst, route
1650-1659
Gerrard, Lee A.
7ece498c-3d15-42f8-8c77-013242423752
Weller, Mark T.
36a60b56-049f-466c-a1d7-39d6b0d85ff4
4 May 2004
Gerrard, Lee A.
7ece498c-3d15-42f8-8c77-013242423752
Weller, Mark T.
36a60b56-049f-466c-a1d7-39d6b0d85ff4
Gerrard, Lee A. and Weller, Mark T.
(2004)
3-dimensional methylammonium and ammonium templated lithiumberyllofluoro frameworks.
Chemistry of Materials, 16 (9), .
(doi:10.1021/cm035316v).
Abstract
Two three-dimensional lithiumberyllofluoride materials, of the same framework stoichiometry but different topologies, have been synthesized using hydrothermal pressure conditions and ammonium/methylammonium cations as structure-directing species. Compound I, [Li2Be2F7] [NH4], and compound II, [Li2Be2F7][CH3NH3], both crystallize in orthorhombic space groups: Pca2(1) for I and Cmcm for II. Single crystal analysis reveals that the materials have slightly different 3-D framework topologies for the [Li2Be2F7] framework composed of [LiF4] and [BeF4] tetrahedra connected through doubly and triply bridging fluorides. Both networks can be viewed as sheets formed of 3- and 4-nets that link perpendicular to the sheet, through a bridging fluoride, to form six-membered interlayer pores. The six-membered channels contain the amine species hydrogen-bonded to framework fluoride ions surrounding the interior of the pore. The thermal stability, spectroscopic properties, and both powder X-ray and neutron data of these compounds are reported, along with the single-crystal analysis used to solve the structures.
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Published date: 4 May 2004
Keywords:
ion-exchange capacity, crystal-structure, hydrothermal synthesis, molecular-sieves, phosphates, lithium, aluminophosphate, zeolite, catalyst, route
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Local EPrints ID: 20213
URI: http://eprints.soton.ac.uk/id/eprint/20213
ISSN: 0897-4756
PURE UUID: 2c4b057a-853c-429b-b0fc-cc68cd958018
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Date deposited: 20 Feb 2006
Last modified: 15 Mar 2024 06:23
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Author:
Lee A. Gerrard
Author:
Mark T. Weller
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