Sm2(SeO3)3 crystallizes in the triclinic P-1 space group. There are two inequivalent Sm sites. In the first Sm site, Sm(1) is bonded in a 9-coordinate geometry to one O(2), one O(3), one O(4), one O(5), one O(7), one O(8), one O(9), and two equivalent O(6) atoms. In the second Sm site, Sm(2) is bonded in a 8-coordinate geometry to one O(1), one O(2), one O(3), one O(4), one O(7), one O(9), and two equivalent O(5) atoms. There are three inequivalent Se sites. In the first Se site, Se(1) is bonded in a trigonal non-coplanar geometry to one O(1), one O(4), and one O(6) atom. In the second Se site, Se(2) is bonded in a distorted trigonal non-coplanar geometry to one O(3), one O(5), and one O(7) atom. In the third Se site, Se(3) is bonded in a trigonal non-coplanar geometry to one O(2), one O(8), and one O(9) atom. There are nine inequivalent O sites. In the first O site, O(1) is bonded in a bent 120 degrees geometry to one Sm(2) and one Se(1) atom. In the second O site, O(2) is bonded in a distorted trigonal non-coplanar geometry to one Sm(1), one Sm(2), and one Se(3) atom. In the third O site, O(3) is bonded in a distorted trigonal non-coplanar geometry to one Sm(1), one Sm(2), and one Se(2) atom. In the fourth O site, O(4) is bonded in a distorted trigonal planar geometry to one Sm(1), one Sm(2), and one Se(1) atom. In the fifth O site, O(5) is bonded to one Sm(1), two equivalent Sm(2), and one Se(2) atom to form distorted edge-sharing OSm3Se tetrahedra. In the sixth O site, O(6) is bonded in a distorted trigonal planar geometry to two equivalent Sm(1) and one Se(1) atom. In the seventh O site, O(7) is bonded in a 3-coordinate geometry to one Sm(1), one Sm(2), and one Se(2) atom. In the eighth O site, O(8) is bonded in a bent 150 degrees geometry to one Sm(1) and one Se(3) atom. In the ninth O site, O(9) is bonded in a distorted trigonal planar geometry to one Sm(1), one Sm(2), and one Se(3) atom.
Sm2(SeO3)3 crystallizes in the triclinic P-1 space group. There are two inequivalent Sm sites. In the first Sm site, Sm(1) is bonded in a 9-coordinate geometry to one O(2), one O(3), one O(4), one O(5), one O(7), one O(8), one O(9), and two equivalent O(6) atoms. The Sm(1)-O(2) bond length is 2.43 Å. The Sm(1)-O(3) bond length is 2.58 Å. The Sm(1)-O(4) bond length is 2.59 Å. The Sm(1)-O(5) bond length is 2.70 Å. The Sm(1)-O(7) bond length is 2.52 Å. The Sm(1)-O(8) bond length is 2.37 Å. The Sm(1)-O(9) bond length is 2.38 Å. There is one shorter (2.36 Å) and one longer (2.55 Å) Sm(1)-O(6) bond length. In the second Sm site, Sm(2) is bonded in a 8-coordinate geometry to one O(1), one O(2), one O(3), one O(4), one O(7), one O(9), and two equivalent O(5) atoms. The Sm(2)-O(1) bond length is 2.33 Å. The Sm(2)-O(2) bond length is 2.47 Å. The Sm(2)-O(3) bond length is 2.41 Å. The Sm(2)-O(4) bond length is 2.36 Å. The Sm(2)-O(7) bond length is 2.46 Å. The Sm(2)-O(9) bond length is 2.41 Å. There is one shorter (2.42 Å) and one longer (2.56 Å) Sm(2)-O(5) bond length. There are three inequivalent Se sites. In the first Se site, Se(1) is bonded in a trigonal non-coplanar geometry to one O(1), one O(4), and one O(6) atom. The Se(1)-O(1) bond length is 1.70 Å. The Se(1)-O(4) bond length is 1.71 Å. The Se(1)-O(6) bond length is 1.71 Å. In the second Se site, Se(2) is bonded in a distorted trigonal non-coplanar geometry to one O(3), one O(5), and one O(7) atom. The Se(2)-O(3) bond length is 1.70 Å. The Se(2)-O(5) bond length is 1.75 Å. The Se(2)-O(7) bond length is 1.70 Å. In the third Se site, Se(3) is bonded in a trigonal non-coplanar geometry to one O(2), one O(8), and one O(9) atom. The Se(3)-O(2) bond length is 1.73 Å. The Se(3)-O(8) bond length is 1.66 Å. The Se(3)-O(9) bond length is 1.74 Å. There are nine inequivalent O sites. In the first O site, O(1) is bonded in a bent 120 degrees geometry to one Sm(2) and one Se(1) atom. In the second O site, O(2) is bonded in a distorted trigonal non-coplanar geometry to one Sm(1), one Sm(2), and one Se(3) atom. In the third O site, O(3) is bonded in a distorted trigonal non-coplanar geometry to one Sm(1), one Sm(2), and one Se(2) atom. In the fourth O site, O(4) is bonded in a distorted trigonal planar geometry to one Sm(1), one Sm(2), and one Se(1) atom. In the fifth O site, O(5) is bonded to one Sm(1), two equivalent Sm(2), and one Se(2) atom to form distorted edge-sharing OSm3Se tetrahedra. In the sixth O site, O(6) is bonded in a distorted trigonal planar geometry to two equivalent Sm(1) and one Se(1) atom. In the seventh O site, O(7) is bonded in a 3-coordinate geometry to one Sm(1), one Sm(2), and one Se(2) atom. In the eighth O site, O(8) is bonded in a bent 150 degrees geometry to one Sm(1) and one Se(3) atom. In the ninth O site, O(9) is bonded in a distorted trigonal planar geometry to one Sm(1), one Sm(2), and one Se(3) atom.