K3Cu2P4HO14 crystallizes in the triclinic P-1 space group. There are two inequivalent K sites. In the first K site, K(1) is bonded in a 4-coordinate geometry to two equivalent O(5) and two equivalent O(6) atoms. In the second K site, K(2) is bonded in a 9-coordinate geometry to three equivalent O(2), three equivalent O(3), and three equivalent O(4) atoms. Cu(1) is bonded to one O(2), one O(3), one O(4), one O(5), and one O(6) atom to form CuO5 square pyramids that share corners with two equivalent P(2)O4 tetrahedra and corners with three equivalent P(1)O4 tetrahedra. 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 corners with three equivalent Cu(1)O5 square pyramids and  a cornercorner with one P(2)O4 tetrahedra. 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 corners with two equivalent Cu(1)O5 square pyramids and  a cornercorner with one P(1)O4 tetrahedra. H(1) is bonded in a linear geometry to two equivalent O(7) atoms. There are seven inequivalent O sites. In the first O site, O(1) is bonded in a bent 120 degrees geometry to one P(1) and one P(2) atom. In the second O site, O(2) is bonded in a 5-coordinate geometry to three equivalent K(2), one Cu(1), and one P(1) atom. In the third O site, O(3) is bonded in a 2-coordinate geometry to three equivalent K(2), one Cu(1), and one P(1) atom. In the fourth O site, O(4) is bonded in a 1-coordinate geometry to three equivalent K(2), one Cu(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 Cu(1), and one P(2) atom. In the sixth O site, O(6) is bonded in a 3-coordinate geometry to one K(1), one Cu(1), and one P(2) atom. In the seventh O site, O(7) is bonded in a bent 120 degrees geometry to one P(2) and one H(1) atom.
K3Cu2P4HO14 crystallizes in the triclinic P-1 space group. There are two inequivalent K sites. In the first K site, K(1) is bonded in a 4-coordinate geometry to two equivalent O(5) and two equivalent O(6) atoms. Both K(1)-O(5) bond lengths are 2.85 Å. Both K(1)-O(6) bond lengths are 2.69 Å. In the second K site, K(2) is bonded in a 9-coordinate geometry to three equivalent O(2), three equivalent O(3), and three equivalent O(4) atoms. There are a spread of K(2)-O(2) bond distances ranging from 2.84-2.87 Å. There are a spread of K(2)-O(3) bond distances ranging from 2.82-2.96 Å. There are a spread of K(2)-O(4) bond distances ranging from 2.74-3.00 Å. Cu(1) is bonded to one O(2), one O(3), one O(4), one O(5), and one O(6) atom to form CuO5 square pyramids that share corners with two equivalent P(2)O4 tetrahedra and corners with three equivalent P(1)O4 tetrahedra. The Cu(1)-O(2) bond length is 1.98 Å. The Cu(1)-O(3) bond length is 1.99 Å. The Cu(1)-O(4) bond length is 2.25 Å. The Cu(1)-O(5) bond length is 1.96 Å. The Cu(1)-O(6) bond length is 1.94 Å. 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 corners with three equivalent Cu(1)O5 square pyramids and  a cornercorner with one P(2)O4 tetrahedra. The P(1)-O(1) bond length is 1.62 Å. The P(1)-O(2) bond length is 1.53 Å. The P(1)-O(3) bond length is 1.53 Å. The P(1)-O(4) bond length is 1.50 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 corners with two equivalent Cu(1)O5 square pyramids and  a cornercorner with one P(1)O4 tetrahedra. The P(2)-O(1) bond length is 1.62 Å. The P(2)-O(5) bond length is 1.52 Å. The P(2)-O(6) bond length is 1.51 Å. The P(2)-O(7) bond length is 1.52 Å. H(1) is bonded in a linear geometry to two equivalent O(7) atoms. Both H(1)-O(7) bond lengths are 1.20 Å. There are seven inequivalent O sites. In the first O site, O(1) is bonded in a bent 120 degrees geometry to one P(1) and one P(2) atom. In the second O site, O(2) is bonded in a 5-coordinate geometry to three equivalent K(2), one Cu(1), and one P(1) atom. In the third O site, O(3) is bonded in a 2-coordinate geometry to three equivalent K(2), one Cu(1), and one P(1) atom. In the fourth O site, O(4) is bonded in a 1-coordinate geometry to three equivalent K(2), one Cu(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 Cu(1), and one P(2) atom. In the sixth O site, O(6) is bonded in a 3-coordinate geometry to one K(1), one Cu(1), and one P(2) atom. In the seventh O site, O(7) is bonded in a bent 120 degrees geometry to one P(2) and one H(1) atom.