KSiCPO7 crystallizes in the monoclinic P2_1 space group. K(1) is bonded in a 7-coordinate geometry to one O(1), one O(2), one O(3), one O(4), one O(7), and two equivalent O(5) atoms. Si(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 SiO6 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 Si(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 14-40°. There are seven inequivalent O sites. In the first O site, O(1) is bonded in a distorted bent 150 degrees geometry to one K(1) and one C(1) atom. In the second O site, O(2) is bonded in a distorted L-shaped geometry to one K(1), one Si(1), and one C(1) atom. In the third O site, O(3) is bonded in a distorted L-shaped geometry to one K(1), one Si(1), and one C(1) atom. In the fourth O site, O(4) is bonded in a bent 150 degrees geometry to one K(1), one Si(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 Si(1), and one P(1) atom. In the sixth O site, O(6) is bonded in a linear geometry to one Si(1) and one P(1) atom. In the seventh O site, O(7) is bonded in a bent 150 degrees geometry to one K(1), one Si(1), and one P(1) atom.
KSiCPO7 crystallizes in the monoclinic P2_1 space group. K(1) is bonded in a 7-coordinate geometry to one O(1), one O(2), one O(3), one O(4), one O(7), and two equivalent O(5) atoms. The K(1)-O(1) bond length is 2.52 Å. The K(1)-O(2) bond length is 2.86 Å. The K(1)-O(3) bond length is 2.77 Å. The K(1)-O(4) bond length is 3.32 Å. The K(1)-O(7) bond length is 3.25 Å. There is one shorter (2.89 Å) and one longer (3.13 Å) K(1)-O(5) bond length. Si(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 SiO6 octahedra that share corners with four equivalent P(1)O4 tetrahedra. The Si(1)-O(2) bond length is 1.81 Å. The Si(1)-O(3) bond length is 1.80 Å. The Si(1)-O(4) bond length is 1.78 Å. The Si(1)-O(5) bond length is 1.82 Å. The Si(1)-O(6) bond length is 1.76 Å. The Si(1)-O(7) bond length is 1.77 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 Si(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 14-40°. The P(1)-O(4) bond length is 1.54 Å. The P(1)-O(5) bond length is 1.54 Å. The P(1)-O(6) bond length is 1.53 Å. The P(1)-O(7) bond length is 1.55 Å. There are seven inequivalent O sites. In the first O site, O(1) is bonded in a distorted bent 150 degrees geometry to one K(1) and one C(1) atom. In the second O site, O(2) is bonded in a distorted L-shaped geometry to one K(1), one Si(1), and one C(1) atom. In the third O site, O(3) is bonded in a distorted L-shaped geometry to one K(1), one Si(1), and one C(1) atom. In the fourth O site, O(4) is bonded in a bent 150 degrees geometry to one K(1), one Si(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 Si(1), and one P(1) atom. In the sixth O site, O(6) is bonded in a linear geometry to one Si(1) and one P(1) atom. In the seventh O site, O(7) is bonded in a bent 150 degrees geometry to one K(1), one Si(1), and one P(1) atom.