SYNTHESIS AND CRYSTAL STRUCTURE OF TWO NEW TETRAFLUOROBORATE CRYSTALLOHYDRATES M(BF4)2·3H2O, M = Sr, Ba

Crystals of two new tetrafluoroborate crystallohydrates M (BF 4 ) 2 ·3H 2 O ( M  = Sr, Ba) are prepared by the evaporation of aqueous solutions. The compounds are studied by single crystal XRD and IR spectroscopy. Sr(BF 4 ) 2 ·3H 2 O crystallizes in the tetragonal crystal system ( a  = 6.9638(4) Å,...

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Bibliographic Details
Published in:Journal of structural chemistry 2023-02, Vol.64 (2), p.253-261
Main Authors: Charkin, D. O., Volkov, S. N., Manelis, L. S., Gosteva, A. N., Aksenov, S. M., Dolgikh, V. A.
Format: Article
Language:English
Subjects:
Alkaline earth metals
Aqueous solutions
Atomic
Atomic/Molecular Structure and Spectra
Barium
Chemistry
Chemistry and Materials Science
Crystal structure
Infrared spectroscopy
Inorganic Chemistry
Molecular
Optical and Plasma Physics
Physical Chemistry
Single crystals
Solid State Physics
Strontium
Tetrahedra
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Summary:Crystals of two new tetrafluoroborate crystallohydrates M (BF 4 ) 2 ·3H 2 O ( M  = Sr, Ba) are prepared by the evaporation of aqueous solutions. The compounds are studied by single crystal XRD and IR spectroscopy. Sr(BF 4 ) 2 ·3H 2 O crystallizes in the tetragonal crystal system ( a  = 6.9638(4) Å, c  = 18.1671(12) Å, space group P 4 2 / mnm ); Ba(BF 4 ) 2 ·3H 2 O crystallizes in the orthorhombic crystal system ( a  = 7.1996(2) Å, b  = 18.0823(5) Å, c  = 7.1860(2) Å, space group C 222 1 ). Their crystal structure is formed by isolated BF 4 tetrahedra and water molecules with alkaline earth metal atoms in between. When cooled to 100 K, Ba(BF 4 ) 2 ·3H 2 O undergoes a polymorphic transition to the monoclinic modification accompanied by pseudo-merohedral twinning of crystals.
ISSN:0022-4766
1573-8779
DOI:10.1134/S0022476623020099