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The missing hydrate AlF3.6H(2)O= Al(H2O)(6) F-3: Ionothermal synthesis, crystal structure and characterization of aluminum fluoride hexahydrate

TitleThe missing hydrate AlF3.6H(2)O= Al(H2O)(6) F-3: Ionothermal synthesis, crystal structure and characterization of aluminum fluoride hexahydrate
Publication TypeJournal Article
Year of Publication2016
AuthorsWang, GM, Mudring, AV
JournalSolid State Sciences
Volume61
Pagination58-62
Date Published11
Type of ArticleArticle
ISBN Number1293-2558
Accession NumberWOS:000388091600009
Keywordsalf3, Aluminum fluoride, chemistry, Crystal structure, dsc, hydroxyfluorides, ionic liquid, ionothermal synthesis, neutron, phase-transitions, physics, ray-powder diffraction, rbalf4, refinement, trifluoride
Abstract

AlF3 is a strong Lewis acid and several hydrates of it are known, namely the monohydrate, the trihydrate (of which two polymorphs have been described) and the nonohydrate, which forms in the abundance of water, as well as a more complex fluoride of composition Al-0.82 square F-0.18(2.46)(H2O)(0.54) whose structure has been related to the ReO3 type. The monohydrate features edge connected [AlF6] octahedra, in the tri- and nonahydrate mixed F/O coordination of aluminum is observed. Here we report on a new aluminium fluoride hydrate, AlF3.6H(2)O, which could be obtained via ionothermal synthesis in the ionic liquid n-hexyl-pyridinium tetrafluoroborate. The ionic liquid serves in the synthesis of AlF3.6H(2)O as the reaction partner (fluoride source) and solvent. Overmore it controls the water activity allowing access to the missing AlF3.6H(2)O. Single-crystal X-ray diffraction analysis of AlF3.6H(2)O shows that it crystallizes in the anti-Li3Bi-type of structure according to F-3[Al(H2O)(6)] (Fm-3m, a = 893.1(2) pm, Z = 4) featuring hexaaqua aluminium(III) cations and isolated fluoride anions. The compound was further characterized by powder X-ray diffraction, TG/DTA, IR analyses. (C) 2016 Published by Elsevier Masson SAS.

DOI10.1016/j.solidstatesciences.2016.09.007
Custom 1

Not AL

Short TitleSolid State Sci.
Alternate JournalSolid State Sci.