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Research article - Peer-reviewed, 2012

A novel route of synthesis of sodium hexafluorosilicate two component cluster crystals using BF4- containing ionic liquids

Välbe, Raul; Mäeorg, Uno; Löhmus, Ants; Reedo, Valter; Koel, Mihkel; Krumme, Andres; Kessler, Vadim; Hoop, Andres; Romanov, Alexey


The cluster crystals of Na2[SiF6] were obtained in the aqueous solutions of different methylalkylimidazolium(ethyl-, butyl- and decyl-) tetrafluoroborate ionic liquids (IL) in borosilicate glassware. It isdemonstrated that sodium hexafluorosilicate crystalline compounds with good regularity and narrowsize distribution containing dialkyl imidazolium ions between the hexagonal crystalline clustersinterconnected to each other to a whole hexagonal aggregate can be obtained in large quantities. Thischaracteristic phenomenon of crystallization of sodium hexafluorosilicate containing IL ions is reportedfor the first time. The mechanism of formation of various [RMIm]BF4–Na2[SiF6] microcrystallinemorphologies and the influence of temperature on the growth kinetics are discussed. Crystallographicstudies of the product were carried out by X-ray diffractometer (XRD), characterization by scanningelectron microscopy (SEM) and optical microscopies; also infrared spectra (IR) were recorded. Thermalanalysis were performed by differential scanning calorimetry–thermogravimetric analyzer (TGA–DSC).Presence of ionic liquid cations was confirmed by high resolution mass spectrometry (HRMS).

Published in

Journal of Crystal Growth
2012, Volume: 361, pages: 51-56

    UKÄ Subject classification

    Materials Chemistry
    Organic Chemistry
    Inorganic Chemistry

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