KCSbPO7 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. C(1) is bonded in a trigonal planar geometry to one O(1), one O(2), and one O(3) atom. Sb(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 SbO6 octahedra that share corners with four equivalent P(1)O4 tetrahedra. 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 Sb(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 40-47°. 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 C(1), and one Sb(1) atom. In the third O site, O(3) is bonded in a 3-coordinate geometry to one K(1), one C(1), and one Sb(1) atom. In the fourth O site, O(4) is bonded in a distorted bent 150 degrees geometry to one Sb(1) and one P(1) atom. In the fifth O site, O(5) is bonded in a 3-coordinate geometry to one K(1), one Sb(1), and one P(1) atom. In the sixth O site, O(6) is bonded in a 2-coordinate geometry to one K(1), one Sb(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 Sb(1), and one P(1) atom.
KCSbPO7 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 2.59 Å. The K(1)-O(2) bond length is 2.79 Å. The K(1)-O(3) bond length is 2.74 Å. The K(1)-O(5) bond length is 2.95 Å. The K(1)-O(6) bond length is 3.09 Å. The K(1)-O(7) bond length is 3.02 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 1.35 Å. The C(1)-O(3) bond length is 1.35 Å. Sb(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 SbO6 octahedra that share corners with four equivalent P(1)O4 tetrahedra. The Sb(1)-O(2) bond length is 2.08 Å. The Sb(1)-O(3) bond length is 2.14 Å. The Sb(1)-O(4) bond length is 2.11 Å. The Sb(1)-O(5) bond length is 2.13 Å. The Sb(1)-O(6) bond length is 2.18 Å. The Sb(1)-O(7) bond length is 2.34 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 Sb(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 40-47°. The P(1)-O(4) bond length is 1.57 Å. The P(1)-O(5) bond length is 1.56 Å. The P(1)-O(6) bond length is 1.55 Å. The P(1)-O(7) bond length is 1.54 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 C(1), and one Sb(1) atom. In the third O site, O(3) is bonded in a 3-coordinate geometry to one K(1), one C(1), and one Sb(1) atom. In the fourth O site, O(4) is bonded in a distorted bent 150 degrees geometry to one Sb(1) and one P(1) atom. In the fifth O site, O(5) is bonded in a 3-coordinate geometry to one K(1), one Sb(1), and one P(1) atom. In the sixth O site, O(6) is bonded in a 2-coordinate geometry to one K(1), one Sb(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 Sb(1), and one P(1) atom.