KCeCPO7 crystallizes in the monoclinic P2_1 space group. K(1) is bonded in a 6-coordinate geometry to one O(1), one O(2), one O(3), one O(5), one O(6), and one O(7) atom. Ce(1) is bonded to one O(2), one O(3), one O(4), one O(5), one O(6), and one O(7) atom to form CeO6 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(4), one O(5), one O(6), and one O(7) atom to form PO4 tetrahedra that share corners with four equivalent Ce(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 33-39°. There are seven inequivalent O sites. In the first O site, O(1) is bonded in a distorted bent 120 degrees geometry to one K(1) and one C(1) atom. In the second O site, O(2) is bonded in a 3-coordinate geometry to one K(1), one Ce(1), and one C(1) atom. In the third O site, O(3) is bonded in a distorted trigonal non-coplanar geometry to one K(1), one Ce(1), and one C(1) atom. In the fourth O site, O(4) is bonded in a bent 150 degrees geometry to one Ce(1) and one P(1) atom. In the fifth O site, O(5) is bonded in a 2-coordinate geometry to one K(1), one Ce(1), and one P(1) atom. In the sixth O site, O(6) is bonded in a distorted bent 150 degrees geometry to one K(1), one Ce(1), and one P(1) atom. In the seventh O site, O(7) is bonded in a 3-coordinate geometry to one K(1), one Ce(1), and one P(1) atom.
KCeCPO7 crystallizes in the monoclinic P2_1 space group. K(1) is bonded in a 6-coordinate geometry to one O(1), one O(2), one O(3), one O(5), one O(6), and one O(7) atom. The K(1)-O(1) bond length is 2.52 Å. The K(1)-O(2) bond length is 2.84 Å. The K(1)-O(3) bond length is 2.71 Å. The K(1)-O(5) bond length is 3.05 Å. The K(1)-O(6) bond length is 3.13 Å. The K(1)-O(7) bond length is 3.15 Å. Ce(1) is bonded to one O(2), one O(3), one O(4), one O(5), one O(6), and one O(7) atom to form CeO6 octahedra that share corners with four equivalent P(1)O4 tetrahedra. The Ce(1)-O(2) bond length is 2.30 Å. The Ce(1)-O(3) bond length is 2.26 Å. The Ce(1)-O(4) bond length is 2.24 Å. The Ce(1)-O(5) bond length is 2.32 Å. The Ce(1)-O(6) bond length is 2.26 Å. The Ce(1)-O(7) bond length is 2.27 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 1.23 Å. The C(1)-O(2) bond length is 1.34 Å. The C(1)-O(3) bond length is 1.35 Å. P(1) is bonded to one O(4), one O(5), one O(6), and one O(7) atom to form PO4 tetrahedra that share corners with four equivalent Ce(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 33-39°. The P(1)-O(4) bond length is 1.55 Å. The P(1)-O(5) bond length is 1.55 Å. The P(1)-O(6) bond length is 1.56 Å. The P(1)-O(7) bond length is 1.56 Å. There are seven inequivalent O sites. In the first O site, O(1) is bonded in a distorted bent 120 degrees geometry to one K(1) and one C(1) atom. In the second O site, O(2) is bonded in a 3-coordinate geometry to one K(1), one Ce(1), and one C(1) atom. In the third O site, O(3) is bonded in a distorted trigonal non-coplanar geometry to one K(1), one Ce(1), and one C(1) atom. In the fourth O site, O(4) is bonded in a bent 150 degrees geometry to one Ce(1) and one P(1) atom. In the fifth O site, O(5) is bonded in a 2-coordinate geometry to one K(1), one Ce(1), and one P(1) atom. In the sixth O site, O(6) is bonded in a distorted bent 150 degrees geometry to one K(1), one Ce(1), and one P(1) atom. In the seventh O site, O(7) is bonded in a 3-coordinate geometry to one K(1), one Ce(1), and one P(1) atom.