K2AlCPO7 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. Al(1) is bonded to one O(2), one O(3), one O(5), one O(6), and two equivalent O(4) atoms to form AlO6 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 Al(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 19-37°. 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 to two equivalent K(1), one Al(1), and one C(1) atom to form distorted edge-sharing OK2AlC trigonal pyramids. In the third O site, O(3) is bonded to two equivalent K(1), one Al(1), and one C(1) atom to form distorted edge-sharing OK2AlC tetrahedra. In the fourth O site, O(4) is bonded in a 2-coordinate geometry to two equivalent K(1), one Al(1), and one P(1) atom. In the fifth O site, O(5) is bonded in a distorted bent 150 degrees geometry to two equivalent K(1), one Al(1), and one P(1) atom. In the sixth O site, O(6) is bonded in a distorted bent 150 degrees geometry to two equivalent K(1), one Al(1), and one P(1) atom.
K2AlCPO7 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 2.58 Å. The K(1)-O(2) bond length is 2.53 Å. The K(1)-O(3) bond length is 2.47 Å. The K(1)-O(5) bond length is 2.80 Å. The K(1)-O(6) bond length is 3.10 Å. There is one shorter (2.79 Å) and one longer (2.98 Å) K(1)-O(4) bond length. Al(1) is bonded to one O(2), one O(3), one O(5), one O(6), and two equivalent O(4) atoms to form AlO6 octahedra that share corners with four equivalent P(1)O4 tetrahedra. The Al(1)-O(2) bond length is 1.96 Å. The Al(1)-O(3) bond length is 1.91 Å. The Al(1)-O(5) bond length is 1.85 Å. The Al(1)-O(6) bond length is 1.84 Å. Both Al(1)-O(4) bond lengths are 2.00 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 1.24 Å. The C(1)-O(2) bond length is 1.31 Å. The C(1)-O(3) bond length is 1.32 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 Al(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 19-37°. The P(1)-O(5) bond length is 1.54 Å. The P(1)-O(6) bond length is 1.55 Å. Both P(1)-O(4) bond lengths are 1.53 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 to two equivalent K(1), one Al(1), and one C(1) atom to form distorted edge-sharing OK2AlC trigonal pyramids. In the third O site, O(3) is bonded to two equivalent K(1), one Al(1), and one C(1) atom to form distorted edge-sharing OK2AlC tetrahedra. In the fourth O site, O(4) is bonded in a 2-coordinate geometry to two equivalent K(1), one Al(1), and one P(1) atom. In the fifth O site, O(5) is bonded in a distorted bent 150 degrees geometry to two equivalent K(1), one Al(1), and one P(1) atom. In the sixth O site, O(6) is bonded in a distorted bent 150 degrees geometry to two equivalent K(1), one Al(1), and one P(1) atom.