CsK2Fe3P4O14Cl crystallizes in the triclinic P-1 space group. Cs(1) is bonded in a 12-coordinate geometry to two equivalent O(6), four equivalent O(1), four equivalent O(7), and two equivalent Cl(1) atoms. K(1) is bonded in a 9-coordinate geometry to one O(5), one O(6), two equivalent O(2), two equivalent O(3), two equivalent O(4), and one Cl(1) atom. There are two inequivalent Fe sites. In the first Fe site, Fe(1) is bonded to two equivalent O(3), two equivalent O(7), and two equivalent Cl(1) atoms to form distorted FeCl2O4 octahedra that share corners with two equivalent Fe(1)Cl2O4 octahedra, corners with two equivalent P(1)O4 tetrahedra, and corners with two equivalent P(2)O4 tetrahedra. The corner-sharing octahedra are not tilted. In the second Fe site, Fe(2) is bonded to one O(2), one O(4), one O(6), and two equivalent O(5) atoms to form distorted FeO5 trigonal bipyramids that share corners with two equivalent P(1)O4 tetrahedra, corners with three equivalent P(2)O4 tetrahedra, and  an edgeedge with one Fe(2)O5 trigonal bipyramid. There are two inequivalent P sites. In the first P site, P(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form PO4 tetrahedra that share  a cornercorner with one Fe(1)Cl2O4 octahedra,  a cornercorner with one P(2)O4 tetrahedra, and corners with two equivalent Fe(2)O5 trigonal bipyramids. The corner-sharing octahedral tilt angles are 22°. In the second P site, P(2) is bonded to one O(1), one O(5), one O(6), and one O(7) atom to form PO4 tetrahedra that share  a cornercorner with one Fe(1)Cl2O4 octahedra,  a cornercorner with one P(1)O4 tetrahedra, and corners with three equivalent Fe(2)O5 trigonal bipyramids. The corner-sharing octahedral tilt angles are 25°. There are seven inequivalent O sites. In the first O site, O(1) is bonded in a bent 120 degrees geometry to two equivalent Cs(1), one P(1), and one P(2) atom. In the second O site, O(2) is bonded in a 4-coordinate geometry to two equivalent K(1), one Fe(2), and one P(1) atom. In the third O site, O(3) is bonded in a distorted bent 150 degrees geometry to two equivalent K(1), one Fe(1), and one P(1) atom. In the fourth O site, O(4) is bonded in a 2-coordinate geometry to two equivalent K(1), one Fe(2), and one P(1) atom. In the fifth O site, O(5) is bonded in a 4-coordinate geometry to one K(1), two equivalent Fe(2), and one P(2) atom. In the sixth O site, O(6) is bonded in a 3-coordinate geometry to one Cs(1), one K(1), one Fe(2), and one P(2) atom. In the seventh O site, O(7) is bonded in a distorted bent 150 degrees geometry to two equivalent Cs(1), one Fe(1), and one P(2) atom. Cl(1) is bonded to two equivalent Cs(1), two equivalent K(1), and two equivalent Fe(1) atoms to form distorted corner-sharing ClCs2K2Fe2 octahedra. The corner-sharing octahedra are not tilted.
CsK2Fe3P4O14Cl crystallizes in the triclinic P-1 space group. Cs(1) is bonded in a 12-coordinate geometry to two equivalent O(6), four equivalent O(1), four equivalent O(7), and two equivalent Cl(1) atoms. Both Cs(1)-O(6) bond lengths are 3.35 Å. There are two shorter (3.22 Å) and two longer (3.33 Å) Cs(1)-O(1) bond lengths. There are two shorter (3.49 Å) and two longer (3.69 Å) Cs(1)-O(7) bond lengths. Both Cs(1)-Cl(1) bond lengths are 3.87 Å. K(1) is bonded in a 9-coordinate geometry to one O(5), one O(6), two equivalent O(2), two equivalent O(3), two equivalent O(4), and one Cl(1) atom. The K(1)-O(5) bond length is 3.07 Å. The K(1)-O(6) bond length is 2.74 Å. There is one shorter (2.76 Å) and one longer (2.93 Å) K(1)-O(2) bond length. There is one shorter (3.14 Å) and one longer (3.25 Å) K(1)-O(3) bond length. There is one shorter (2.90 Å) and one longer (3.09 Å) K(1)-O(4) bond length. The K(1)-Cl(1) bond length is 3.10 Å. There are two inequivalent Fe sites. In the first Fe site, Fe(1) is bonded to two equivalent O(3), two equivalent O(7), and two equivalent Cl(1) atoms to form distorted FeCl2O4 octahedra that share corners with two equivalent Fe(1)Cl2O4 octahedra, corners with two equivalent P(1)O4 tetrahedra, and corners with two equivalent P(2)O4 tetrahedra. The corner-sharing octahedra are not tilted. Both Fe(1)-O(3) bond lengths are 2.07 Å. Both Fe(1)-O(7) bond lengths are 2.19 Å. Both Fe(1)-Cl(1) bond lengths are 2.70 Å. In the second Fe site, Fe(2) is bonded to one O(2), one O(4), one O(6), and two equivalent O(5) atoms to form distorted FeO5 trigonal bipyramids that share corners with two equivalent P(1)O4 tetrahedra, corners with three equivalent P(2)O4 tetrahedra, and  an edgeedge with one Fe(2)O5 trigonal bipyramid. The Fe(2)-O(2) bond length is 2.03 Å. The Fe(2)-O(4) bond length is 2.11 Å. The Fe(2)-O(6) bond length is 2.04 Å. There is one shorter (2.10 Å) and one longer (2.34 Å) Fe(2)-O(5) bond length. There are two inequivalent P sites. In the first P site, P(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form PO4 tetrahedra that share  a cornercorner with one Fe(1)Cl2O4 octahedra,  a cornercorner with one P(2)O4 tetrahedra, and corners with two equivalent Fe(2)O5 trigonal bipyramids. The corner-sharing octahedral tilt angles are 22°. The P(1)-O(1) bond length is 1.65 Å. The P(1)-O(2) bond length is 1.54 Å. The P(1)-O(3) bond length is 1.51 Å. The P(1)-O(4) bond length is 1.53 Å. In the second P site, P(2) is bonded to one O(1), one O(5), one O(6), and one O(7) atom to form PO4 tetrahedra that share  a cornercorner with one Fe(1)Cl2O4 octahedra,  a cornercorner with one P(1)O4 tetrahedra, and corners with three equivalent Fe(2)O5 trigonal bipyramids. The corner-sharing octahedral tilt angles are 25°. The P(2)-O(1) bond length is 1.65 Å. The P(2)-O(5) bond length is 1.56 Å. The P(2)-O(6) bond length is 1.54 Å. The P(2)-O(7) bond length is 1.50 Å. There are seven inequivalent O sites. In the first O site, O(1) is bonded in a bent 120 degrees geometry to two equivalent Cs(1), one P(1), and one P(2) atom. In the second O site, O(2) is bonded in a 4-coordinate geometry to two equivalent K(1), one Fe(2), and one P(1) atom. In the third O site, O(3) is bonded in a distorted bent 150 degrees geometry to two equivalent K(1), one Fe(1), and one P(1) atom. In the fourth O site, O(4) is bonded in a 2-coordinate geometry to two equivalent K(1), one Fe(2), and one P(1) atom. In the fifth O site, O(5) is bonded in a 4-coordinate geometry to one K(1), two equivalent Fe(2), and one P(2) atom. In the sixth O site, O(6) is bonded in a 3-coordinate geometry to one Cs(1), one K(1), one Fe(2), and one P(2) atom. In the seventh O site, O(7) is bonded in a distorted bent 150 degrees geometry to two equivalent Cs(1), one Fe(1), and one P(2) atom. Cl(1) is bonded to two equivalent Cs(1), two equivalent K(1), and two equivalent Fe(1) atoms to form distorted corner-sharing ClCs2K2Fe2 octahedra. The corner-sharing octahedra are not tilted.