KSm(WO4)2 crystallizes in the monoclinic C2/c space group. K(1) is bonded in a 10-coordinate geometry to two equivalent O(2), two equivalent O(3), two equivalent O(4), and four equivalent O(1) atoms. Sm(1) is bonded in a 8-coordinate geometry to two equivalent O(3), two equivalent O(4), and four equivalent O(2) atoms. W(1) is bonded in a 6-coordinate geometry to one O(2), one O(4), two equivalent O(1), and two equivalent O(3) atoms. There are four inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to two equivalent K(1) and two equivalent W(1) atoms. In the second O site, O(2) is bonded in a 4-coordinate geometry to one K(1), two equivalent Sm(1), and one W(1) atom. In the third O site, O(3) is bonded in a 4-coordinate geometry to one K(1), one Sm(1), and two equivalent W(1) atoms. In the fourth O site, O(4) is bonded in a 3-coordinate geometry to one K(1), one Sm(1), and one W(1) atom.
KSm(WO4)2 crystallizes in the monoclinic C2/c space group. K(1) is bonded in a 10-coordinate geometry to two equivalent O(2), two equivalent O(3), two equivalent O(4), and four equivalent O(1) atoms. Both K(1)-O(2) bond lengths are 3.17 Å. Both K(1)-O(3) bond lengths are 3.02 Å. Both K(1)-O(4) bond lengths are 2.93 Å. There are two shorter (2.84 Å) and two longer (2.89 Å) K(1)-O(1) bond lengths. Sm(1) is bonded in a 8-coordinate geometry to two equivalent O(3), two equivalent O(4), and four equivalent O(2) atoms. Both Sm(1)-O(3) bond lengths are 2.33 Å. Both Sm(1)-O(4) bond lengths are 2.33 Å. There are two shorter (2.38 Å) and two longer (2.72 Å) Sm(1)-O(2) bond lengths. W(1) is bonded in a 6-coordinate geometry to one O(2), one O(4), two equivalent O(1), and two equivalent O(3) atoms. The W(1)-O(2) bond length is 1.84 Å. The W(1)-O(4) bond length is 1.79 Å. There is one shorter (1.80 Å) and one longer (2.30 Å) W(1)-O(1) bond length. There is one shorter (1.96 Å) and one longer (2.11 Å) W(1)-O(3) bond length. There are four inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to two equivalent K(1) and two equivalent W(1) atoms. In the second O site, O(2) is bonded in a 4-coordinate geometry to one K(1), two equivalent Sm(1), and one W(1) atom. In the third O site, O(3) is bonded in a 4-coordinate geometry to one K(1), one Sm(1), and two equivalent W(1) atoms. In the fourth O site, O(4) is bonded in a 3-coordinate geometry to one K(1), one Sm(1), and one W(1) atom.