Abstract
Crystals of two new tetrafluoroborate crystallohydrates M(BF4)2·3H2O (M = Sr, Ba) are prepared by the evaporation of aqueous solutions. The compounds are studied by single crystal XRD and IR spectroscopy. Sr(BF4)2·3H2O crystallizes in the tetragonal crystal system (a = 6.9638(4) Å, c = 18.1671(12) Å, space group P42/mnm); Ba(BF4)2·3H2O crystallizes in the orthorhombic crystal system (a = 7.1996(2) Å, b = 18.0823(5) Å, c = 7.1860(2) Å, space group C2221). Their crystal structure is formed by isolated BF4 tetrahedra and water molecules with alkaline earth metal atoms in between. When cooled to 100 K, Ba(BF4)2·3H2O undergoes a polymorphic transition to the monoclinic modification accompanied by pseudo-merohedral twinning of crystals.
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The study was funded by the Russian Foundation for Basic Research (project No. 20-03-00702).
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Russian Text © The Author(s), 2023, published in Zhurnal Strukturnoi Khimii, 2023, Vol. 64, No. 2, 106035.https://doi.org/10.26902/JSC_id106035
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Charkin, D.O., Volkov, S.N., Manelis, L.S. et al. SYNTHESIS AND CRYSTAL STRUCTURE OF TWO NEW TETRAFLUOROBORATE CRYSTALLOHYDRATES M(BF4)2·3H2O, M = Sr, Ba. J Struct Chem 64, 253–261 (2023). https://doi.org/10.1134/S0022476623020099
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DOI: https://doi.org/10.1134/S0022476623020099