K2SmMoPO8 crystallizes in the orthorhombic Ibca space group. K(1) is bonded in a 8-coordinate geometry to one O(1), two equivalent O(2), two equivalent O(3), and three equivalent O(4) atoms. Sm(1) is bonded to two equivalent O(2), two equivalent O(3), and four equivalent O(1) atoms to form distorted SmO8 hexagonal bipyramids that share corners with two equivalent Mo(1)O4 tetrahedra, corners with two equivalent P(1)O4 tetrahedra, edges with two equivalent Sm(1)O8 hexagonal bipyramids, and edges with two equivalent P(1)O4 tetrahedra. Mo(1) is bonded to two equivalent O(3) and two equivalent O(4) atoms to form MoO4 tetrahedra that share corners with two equivalent Sm(1)O8 hexagonal bipyramids. P(1) is bonded to two equivalent O(1) and two equivalent O(2) atoms to form PO4 tetrahedra that share corners with two equivalent Sm(1)O8 hexagonal bipyramids and edges with two equivalent Sm(1)O8 hexagonal bipyramids. There are four inequivalent O sites. In the first O site, O(4) is bonded in a 4-coordinate geometry to three equivalent K(1) and one Mo(1) atom. In the second O site, O(1) is bonded in a 1-coordinate geometry to one K(1), two equivalent Sm(1), and one P(1) atom. In the third O site, O(2) is bonded in a distorted single-bond geometry to two equivalent K(1), one Sm(1), and one P(1) atom. In the fourth O site, O(3) is bonded in a 4-coordinate geometry to two equivalent K(1), one Sm(1), and one Mo(1) atom.
K2SmMoPO8 crystallizes in the orthorhombic Ibca space group. K(1) is bonded in a 8-coordinate geometry to one O(1), two equivalent O(2), two equivalent O(3), and three equivalent O(4) atoms. The K(1)-O(1) bond length is 3.07 Å. There is one shorter (2.74 Å) and one longer (2.81 Å) K(1)-O(2) bond length. There is one shorter (3.02 Å) and one longer (3.24 Å) K(1)-O(3) bond length. There are a spread of K(1)-O(4) bond distances ranging from 2.71-3.23 Å. Sm(1) is bonded to two equivalent O(2), two equivalent O(3), and four equivalent O(1) atoms to form distorted SmO8 hexagonal bipyramids that share corners with two equivalent Mo(1)O4 tetrahedra, corners with two equivalent P(1)O4 tetrahedra, edges with two equivalent Sm(1)O8 hexagonal bipyramids, and edges with two equivalent P(1)O4 tetrahedra. Both Sm(1)-O(2) bond lengths are 2.47 Å. Both Sm(1)-O(3) bond lengths are 2.42 Å. There are two shorter (2.37 Å) and two longer (2.51 Å) Sm(1)-O(1) bond lengths. Mo(1) is bonded to two equivalent O(3) and two equivalent O(4) atoms to form MoO4 tetrahedra that share corners with two equivalent Sm(1)O8 hexagonal bipyramids. Both Mo(1)-O(3) bond lengths are 1.82 Å. Both Mo(1)-O(4) bond lengths are 1.78 Å. P(1) is bonded to two equivalent O(1) and two equivalent O(2) atoms to form PO4 tetrahedra that share corners with two equivalent Sm(1)O8 hexagonal bipyramids and edges with two equivalent Sm(1)O8 hexagonal bipyramids. Both P(1)-O(1) bond lengths are 1.57 Å. Both P(1)-O(2) bond lengths are 1.55 Å. There are four inequivalent O sites. In the first O site, O(4) is bonded in a 4-coordinate geometry to three equivalent K(1) and one Mo(1) atom. In the second O site, O(1) is bonded in a 1-coordinate geometry to one K(1), two equivalent Sm(1), and one P(1) atom. In the third O site, O(2) is bonded in a distorted single-bond geometry to two equivalent K(1), one Sm(1), and one P(1) atom. In the fourth O site, O(3) is bonded in a 4-coordinate geometry to two equivalent K(1), one Sm(1), and one Mo(1) atom.