Av. Arakcheeva et al., New boron-oxygen layer in the structure of barium hydrodecaborate Ba-5[B20O33(OH)(4)]center dot H2O, CRYSTALLO R, 45(3), 2000, pp. 405-409
The crystal structure of the new synthetic compound Ba-5[B20O33(OH)(4)] . H
2O was established by the methods of X-ray diffraction (a Stoe IPDS diffrac
tometer, lambda MoKalpha, 1860 independent reflections, anisotropic refinem
ent, R = 1.95%, localization of hydrogen atoms): a = 9.495(2) Angstrom, b =
6.713(1) Angstrom, c = 11.709(2) Angstrom, beta = 95.09(1)degrees, sp. gr.
P2, Z = 1. The structure is based on double pseudohexagonal layers consist
ing of BO4-tetrahedra and BO3 triangles linked into three-membered rings in
two mutually perpendicular directions. The double layers adjacent along th
e [100] direction are linked together through the Ba-polyhedra and hydrogen
bonds with the participation of the OH-groups occupying the "end" vertices
of two B-triangles. The interlayer space is also filled with a sheet of Ba
-polyhedra. The structure of the compound is compared to the structures of
topologically similar Ba and Ca berates and hydroborates. (C) 2000 MAIK "Na
uka/Interperiodica".