Li2Mg(ZrF6)2 · 4H2O: Synthesis, X-ray crystallographic, thermal, and MAS NMR study
作者： K. A. Gaivoronskaya , A. V. Gerasimenko , N. A. Didenko , A. B. Slobodyuk , V. Ya. Kavun
DOI: 10.1134/S0036023613020058
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摘要: A new zirconate with lithium and magnesium cations of composition Li2Mg(ZrF6)2 · 4H2O (I) has been synthesized studied by different methods (X-ray crystallography, differential thermal analysis, IR spectroscopy, NMR (1H, 7Li, 19F, including 19F MAS NMR). The framework structure I is composed edge- vertex-sharing ZrF8 dodecahedra, Mg(Ow)2F4 octahedra, Li(Ow)F4 square pyramids. additionally stabilized O-H...F O-H...O hydrogen bonds. Compound dehydrated in one stage the temperature range 105–200°C to form (II). latter undergoes irreversible phase transition at 365°C leading its decomposition into a mixture MgZrF6 (cubic) Li2ZrF6 (hexagonal). According data, fluorozirconate chains compound retained after dehydration.
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