3-dimensional methylammonium and ammonium templated lithiumberyllofluoro frameworks

Lee A. Gerrard, Mark T. Weller

Research output: Contribution to journalArticlepeer-review

12 Citations (SciVal)


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, [LiBeF ][NH], and compound II, [LiBe F][CHNH], both crystallize in orthorhombic space groups: Pca2 for I and Cmcm for II. Single crystal analysis reveals that the materials have slightly different 3-D framework topologies for the [LiBeF] framework composed of [LiF] and [BeF] 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.
Original languageEnglish
Pages (from-to)1650-1659
JournalChemistry of Materials
Issue number9
Publication statusPublished - 4 May 2004


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