K2LuCPO7 crystallizes in the monoclinic P2_1/m space group. K(1) is bonded in a 7-coordinate geometry to one O(1), one O(2), one O(3), one O(5), one O(6), and two equivalent O(4) atoms. Lu(1) is bonded to one O(2), one O(3), one O(5), one O(6), and two equivalent O(4) atoms to form LuO6 octahedra that share corners with four equivalent P(1)O4 tetrahedra. C(1) is bonded in a trigonal planar geometry to one O(1), one O(2), and one O(3) atom. P(1) is bonded to one O(5), one O(6), and two equivalent O(4) atoms to form PO4 tetrahedra that share corners with four equivalent Lu(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 37-39°. There are six inequivalent O sites. In the first O site, O(1) is bonded in a 3-coordinate geometry to two equivalent K(1) and one C(1) atom. In the second O site, O(2) is bonded in a distorted rectangular see-saw-like geometry to two equivalent K(1), one Lu(1), and one C(1) atom. In the third O site, O(3) is bonded in a 4-coordinate geometry to two equivalent K(1), one Lu(1), and one C(1) atom. In the fourth O site, O(4) is bonded in a 2-coordinate geometry to two equivalent K(1), one Lu(1), and one P(1) atom. In the fifth O site, O(5) is bonded in a 4-coordinate geometry to two equivalent K(1), one Lu(1), and one P(1) atom. In the sixth O site, O(6) is bonded in a 2-coordinate geometry to two equivalent K(1), one Lu(1), and one P(1) atom.
K2LuCPO7 crystallizes in the monoclinic P2_1/m space group. K(1) is bonded in a 7-coordinate geometry to one O(1), one O(2), one O(3), one O(5), one O(6), and two equivalent O(4) atoms. The K(1)-O(1) bond length is 2.56 Å. The K(1)-O(2) bond length is 2.67 Å. The K(1)-O(3) bond length is 2.63 Å. The K(1)-O(5) bond length is 2.85 Å. The K(1)-O(6) bond length is 3.11 Å. There is one shorter (3.09 Å) and one longer (3.23 Å) K(1)-O(4) bond length. Lu(1) is bonded to one O(2), one O(3), one O(5), one O(6), and two equivalent O(4) atoms to form LuO6 octahedra that share corners with four equivalent P(1)O4 tetrahedra. The Lu(1)-O(2) bond length is 2.28 Å. The Lu(1)-O(3) bond length is 2.22 Å. The Lu(1)-O(5) bond length is 2.18 Å. The Lu(1)-O(6) bond length is 2.16 Å. Both Lu(1)-O(4) bond lengths are 2.24 Å. C(1) is bonded in a trigonal planar geometry to one O(1), one O(2), and one O(3) atom. The C(1)-O(1) bond length is 1.26 Å. The C(1)-O(2) bond length is 1.32 Å. The C(1)-O(3) bond length is 1.33 Å. P(1) is bonded to one O(5), one O(6), and two equivalent O(4) atoms to form PO4 tetrahedra that share corners with four equivalent Lu(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 37-39°. The P(1)-O(5) bond length is 1.57 Å. The P(1)-O(6) bond length is 1.57 Å. Both P(1)-O(4) bond lengths are 1.55 Å. There are six inequivalent O sites. In the first O site, O(1) is bonded in a 3-coordinate geometry to two equivalent K(1) and one C(1) atom. In the second O site, O(2) is bonded in a distorted rectangular see-saw-like geometry to two equivalent K(1), one Lu(1), and one C(1) atom. In the third O site, O(3) is bonded in a 4-coordinate geometry to two equivalent K(1), one Lu(1), and one C(1) atom. In the fourth O site, O(4) is bonded in a 2-coordinate geometry to two equivalent K(1), one Lu(1), and one P(1) atom. In the fifth O site, O(5) is bonded in a 4-coordinate geometry to two equivalent K(1), one Lu(1), and one P(1) atom. In the sixth O site, O(6) is bonded in a 2-coordinate geometry to two equivalent K(1), one Lu(1), and one P(1) atom.