Crystal structures, infrared-spectra, and thermal behavior of calcium hydrogenselenite monohydrate, Ca(HSeO 3) 2 · H 2O, and dicalcium diselenite bis(hydrogenselenite), Ca 2(HSeO 3) 2(Se 2O 5)
Abstract
Calcium hydrogenselenite monohydrate and dicalcium diselenite bis(hydrogenselenite) were synthesized and their crystal structures determined. Crystal data for Ca(HSeO 3) 2 · H 2O: a = 6.911(2), b = 7.369(2), c = 6.739(2) Å, α = 90.51(3)°, β = 90.93(3)°, γ = 107.46(2)°, V = 327.3(2) Å 3, space group P overline1 (No. 2), dcalcd = 3.19 M gm -3, Z = 2, and R = 0.036 for 1503 reflections. Data for Ca 2(HSeO 3) 2(Se 2O 5): a = 14.719(4), b = 7.059(2), c = 11.793(2) Å, β = 117.96(2)°, V = 1082.3(4) Å 3, space group {C2}/{c} (No. 15), dcalcd = 3.52 Mg m -3, Z = 4, and R = 0.047 for 1251 reflections. Both structures form a three-dimensional network. The coordination polyhedron around calcium is a monocapped trigonal prism in dicalcium diselenite bis(hydrogenselenite) and a bicapped trigonal prism in calcium hydrogenselenite monohydrate. The CaO distance varies from 2.368 to 2.615 Å. Thermal behavior was investigated and the infrared spectrum assigned for dicalcium diselenite bis(Hydrogenselenite).
- Publication:
-
Journal of Solid State Chemistry France
- Pub Date:
- December 1986
- DOI:
- 10.1016/0022-4596(86)90109-X
- Bibcode:
- 1986JSSCh..65..363V