THE CRYSTAL-STRUCTURE OF FE2(SEO3)3.H2O

Crystals of Fe2(SeO3)3 · H2O, obtained by hydrothermal synthesis, were structurally investigated by single crystal X-ray diffraction methods: a = 7.955(2)Å, b = 9.890(2)Å, c = 11.538(3) Å, β = 101.65(1)°, V = 889.05, Å3, Z = 4, space group P21/n, R = 0.042, Rw = 0.037 for 2188 independent reflections (sin θ/λ ≤ 0.7Å-1). [Fel[60] Fe2[50+1Ow]O10]-groups of edge-sharing Fe(III)-polyhedra are corner connected via Se(IV)O3 pyramids to a framework structure. Octahedral Fe-O distances are in the range 1.954-2.102Å for Fe1 and 1.928-2.117Å for Fe2 with mean bond lengths of 2.007 and 2.015Å. The selenite groups are moderately distorted; the mean Se-O lengths are 1.681, 1.695, and 1.708Å. © 1993 Academic Press. All rights reserved.