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- Title
SYNTHESIS AND CRYSTAL STRUCTURE OF TWO NEW TETRAFLUOROBORATE CRYSTALLOHYDRATES M(BF<sub>4</sub>)<sub>2</sub>·3H<sub>2</sub>O, M = Sr, Ba.
- Authors
Charkin, D. O.; Volkov, S. N.; Manelis, L. S.; Gosteva, A. N.; Aksenov, S. M.; Dolgikh, V. A.
- 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.
- Subjects
TETRAGONAL crystal system; CRYSTAL structure; ORTHORHOMBIC crystal system; TWINNING (Crystallography); TETRAFLUOROBORATES; ALKALINE earth metals; BORON trifluoride
- Publication
Journal of Structural Chemistry, 2023, Vol 64, Issue 2, p253
- ISSN
0022-4766
- Publication type
Article
- DOI
10.1134/S0022476623020099