Structure Of Sodium Hydrogen Selenite Selenious Acid Adduct (1/3), Nahseo3.3h2seo3

Structute of sodium hydrogen selenite-selenious acid (1 : 3) was solved by heavy-atom method and refined anisotropically to R = 0.098 for 1 223 unique observed reflections. The title compound crystallizes in the Pc space group with a = 5.756(2), b = 4.911(2), c = 20.010(5) angstrom, beta = 100.48(3)degrees, V = 556(1) angstrom3, T = 293 K, (a = 5.763(2), b = 4.878(1), c = 20.03(l) angstrom, beta = 100.48(3)degrees, V = 554(1) angstrom3, T = 173 K), Z = 2. The structure consist of HSeO3- anions, molecules of selenious acid and Na+ cations which are octahedrally coordinated with oxygen atoms. The structure is stabilized by a system of hydrogen bonds.