Fe(SeO3)3 crystallizes in the monoclinic P2_1/c space group. Fe(1) is bonded to one O(1), one O(2), one O(4), one O(5), one O(7), and one O(8) atom to form FeO6 octahedra that share corners with two equivalent Se(1)O4 tetrahedra. There are three inequivalent Se sites. In the first Se site, Se(1) is bonded to one O(1), one O(2), one O(3), and one O(6) atom to form SeO4 tetrahedra that share corners with two equivalent Fe(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 51-57°. In the second Se site, Se(2) is bonded in a distorted trigonal non-coplanar geometry to one O(4), one O(5), and one O(6) atom. In the third Se site, Se(3) is bonded in a trigonal non-coplanar geometry to one O(7), one O(8), and one O(9) atom. There are nine inequivalent O sites. In the first O site, O(5) is bonded in a bent 120 degrees geometry to one Fe(1) and one Se(2) atom. In the second O site, O(6) is bonded in a bent 120 degrees geometry to one Se(1) and one Se(2) atom. In the third O site, O(7) is bonded in a bent 150 degrees geometry to one Fe(1) and one Se(3) atom. In the fourth O site, O(8) is bonded in a bent 150 degrees geometry to one Fe(1) and one Se(3) atom. In the fifth O site, O(1) is bonded in a bent 120 degrees geometry to one Fe(1) and one Se(1) atom. In the sixth O site, O(9) is bonded in a single-bond geometry to one Se(3) atom. In the seventh O site, O(2) is bonded in a bent 120 degrees geometry to one Fe(1) and one Se(1) atom. In the eighth O site, O(3) is bonded in a single-bond geometry to one Se(1) atom. In the ninth O site, O(4) is bonded in a bent 120 degrees geometry to one Fe(1) and one Se(2) atom.
Fe(SeO3)3 crystallizes in the monoclinic P2_1/c space group. Fe(1) is bonded to one O(1), one O(2), one O(4), one O(5), one O(7), and one O(8) atom to form FeO6 octahedra that share corners with two equivalent Se(1)O4 tetrahedra. The Fe(1)-O(1) bond length is 2.05 Å. The Fe(1)-O(2) bond length is 2.08 Å. The Fe(1)-O(4) bond length is 2.03 Å. The Fe(1)-O(5) bond length is 2.01 Å. The Fe(1)-O(7) bond length is 2.01 Å. The Fe(1)-O(8) bond length is 2.04 Å. There are three inequivalent Se sites. In the first Se site, Se(1) is bonded to one O(1), one O(2), one O(3), and one O(6) atom to form SeO4 tetrahedra that share corners with two equivalent Fe(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 51-57°. The Se(1)-O(1) bond length is 1.67 Å. The Se(1)-O(2) bond length is 1.68 Å. The Se(1)-O(3) bond length is 1.63 Å. The Se(1)-O(6) bond length is 1.79 Å. In the second Se site, Se(2) is bonded in a distorted trigonal non-coplanar geometry to one O(4), one O(5), and one O(6) atom. The Se(2)-O(4) bond length is 1.69 Å. The Se(2)-O(5) bond length is 1.69 Å. The Se(2)-O(6) bond length is 1.93 Å. In the third Se site, Se(3) is bonded in a trigonal non-coplanar geometry to one O(7), one O(8), and one O(9) atom. The Se(3)-O(7) bond length is 1.73 Å. The Se(3)-O(8) bond length is 1.72 Å. The Se(3)-O(9) bond length is 1.67 Å. There are nine inequivalent O sites. In the first O site, O(5) is bonded in a bent 120 degrees geometry to one Fe(1) and one Se(2) atom. In the second O site, O(6) is bonded in a bent 120 degrees geometry to one Se(1) and one Se(2) atom. In the third O site, O(7) is bonded in a bent 150 degrees geometry to one Fe(1) and one Se(3) atom. In the fourth O site, O(8) is bonded in a bent 150 degrees geometry to one Fe(1) and one Se(3) atom. In the fifth O site, O(1) is bonded in a bent 120 degrees geometry to one Fe(1) and one Se(1) atom. In the sixth O site, O(9) is bonded in a single-bond geometry to one Se(3) atom. In the seventh O site, O(2) is bonded in a bent 120 degrees geometry to one Fe(1) and one Se(1) atom. In the eighth O site, O(3) is bonded in a single-bond geometry to one Se(1) atom. In the ninth O site, O(4) is bonded in a bent 120 degrees geometry to one Fe(1) and one Se(2) atom.