Sm2Cu(SeO3)4 crystallizes in the monoclinic P2_1/c space group. Sm(1) is bonded in a 10-coordinate geometry to one O(5), two equivalent O(2), two equivalent O(3), two equivalent O(4), and three equivalent O(1) atoms. Cu(1) is bonded in a square co-planar geometry to two equivalent O(5) and two equivalent O(6) atoms. There are two inequivalent Se sites. In the first Se site, Se(1) is bonded in a trigonal non-coplanar geometry to one O(1), one O(2), and one O(3) atom. In the second Se site, Se(2) is bonded in a trigonal non-coplanar geometry to one O(4), one O(5), and one O(6) atom. There are six inequivalent O sites. In the first O site, O(6) is bonded in a bent 120 degrees geometry to one Cu(1) and one Se(2) atom. In the second O site, O(1) is bonded in a 4-coordinate geometry to three equivalent Sm(1) and one Se(1) atom. In the third O site, O(2) is bonded in a 2-coordinate geometry to two equivalent Sm(1) and one Se(1) atom. In the fourth O site, O(3) is bonded in a distorted trigonal non-coplanar geometry to two equivalent Sm(1) and one Se(1) atom. In the fifth O site, O(4) is bonded in a trigonal planar geometry to two equivalent Sm(1) and one Se(2) atom. In the sixth O site, O(5) is bonded in a distorted bent 120 degrees geometry to one Sm(1), one Cu(1), and one Se(2) atom.
Sm2Cu(SeO3)4 crystallizes in the monoclinic P2_1/c space group. Sm(1) is bonded in a 10-coordinate geometry to one O(5), two equivalent O(2), two equivalent O(3), two equivalent O(4), and three equivalent O(1) atoms. The Sm(1)-O(5) bond length is 2.72 Å. There is one shorter (2.43 Å) and one longer (2.95 Å) Sm(1)-O(2) bond length. There is one shorter (2.45 Å) and one longer (2.46 Å) Sm(1)-O(3) bond length. There is one shorter (2.45 Å) and one longer (2.48 Å) Sm(1)-O(4) bond length. There are a spread of Sm(1)-O(1) bond distances ranging from 2.52-2.73 Å. Cu(1) is bonded in a square co-planar geometry to two equivalent O(5) and two equivalent O(6) atoms. Both Cu(1)-O(5) bond lengths are 1.97 Å. Both Cu(1)-O(6) bond lengths are 1.94 Å. There are two inequivalent Se sites. In the first Se site, Se(1) is bonded in a trigonal non-coplanar geometry to one O(1), one O(2), and one O(3) atom. The Se(1)-O(1) bond length is 1.76 Å. The Se(1)-O(2) bond length is 1.71 Å. The Se(1)-O(3) bond length is 1.74 Å. In the second Se site, Se(2) is bonded in a trigonal non-coplanar geometry to one O(4), one O(5), and one O(6) atom. The Se(2)-O(4) bond length is 1.72 Å. The Se(2)-O(5) bond length is 1.76 Å. The Se(2)-O(6) bond length is 1.74 Å. There are six inequivalent O sites. In the first O site, O(6) is bonded in a bent 120 degrees geometry to one Cu(1) and one Se(2) atom. In the second O site, O(1) is bonded in a 4-coordinate geometry to three equivalent Sm(1) and one Se(1) atom. In the third O site, O(2) is bonded in a 2-coordinate geometry to two equivalent Sm(1) and one Se(1) atom. In the fourth O site, O(3) is bonded in a distorted trigonal non-coplanar geometry to two equivalent Sm(1) and one Se(1) atom. In the fifth O site, O(4) is bonded in a trigonal planar geometry to two equivalent Sm(1) and one Se(2) atom. In the sixth O site, O(5) is bonded in a distorted bent 120 degrees geometry to one Sm(1), one Cu(1), and one Se(2) atom.