NaFe2P2HO8 crystallizes in the triclinic P-1 space group. Na(1) is bonded in a 6-coordinate geometry to one O(1), one O(3), one O(4), one O(6), one O(7), and one O(8) atom. There are two inequivalent Fe sites. In the first Fe site, Fe(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form FeO4 tetrahedra that share  a cornercorner with one Fe(2)O4 tetrahedra, corners with two equivalent P(1)O4 tetrahedra, and corners with two equivalent P(2)O4 tetrahedra. In the second Fe site, Fe(2) is bonded to one O(2), one O(5), one O(6), and one O(7) atom to form FeO4 tetrahedra that share  a cornercorner with one Fe(1)O4 tetrahedra,  a cornercorner with one P(1)O4 tetrahedra, and corners with three equivalent P(2)O4 tetrahedra. There are two inequivalent P sites. In the first P site, P(1) is bonded to one O(1), one O(3), one O(5), and one O(8) atom to form PO4 tetrahedra that share  a cornercorner with one Fe(2)O4 tetrahedra and corners with two equivalent Fe(1)O4 tetrahedra. In the second P site, P(2) is bonded to one O(2), one O(4), one O(6), and one O(7) atom to form PO4 tetrahedra that share corners with two equivalent Fe(1)O4 tetrahedra and corners with three equivalent Fe(2)O4 tetrahedra. H(1) is bonded in a single-bond geometry to one O(8) atom. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a trigonal planar geometry to one Na(1), one Fe(1), and one P(1) atom. In the second O site, O(2) is bonded in a trigonal planar geometry to one Fe(1), one Fe(2), and one P(2) atom. In the third O site, O(3) is bonded in a trigonal planar geometry to one Na(1), one Fe(1), and one P(1) atom. In the fourth O site, O(4) is bonded in a 3-coordinate geometry to one Na(1), one Fe(1), and one P(2) atom. In the fifth O site, O(5) is bonded in a distorted bent 120 degrees geometry to one Fe(2) and one P(1) atom. In the sixth O site, O(6) is bonded in a 2-coordinate geometry to one Na(1), one Fe(2), and one P(2) atom. In the seventh O site, O(7) is bonded in a 3-coordinate geometry to one Na(1), one Fe(2), and one P(2) atom. In the eighth O site, O(8) is bonded in a distorted trigonal planar geometry to one Na(1), one P(1), and one H(1) atom.
NaFe2P2HO8 crystallizes in the triclinic P-1 space group. Na(1) is bonded in a 6-coordinate geometry to one O(1), one O(3), one O(4), one O(6), one O(7), and one O(8) atom. The Na(1)-O(1) bond length is 2.43 Å. The Na(1)-O(3) bond length is 2.36 Å. The Na(1)-O(4) bond length is 2.45 Å. The Na(1)-O(6) bond length is 2.97 Å. The Na(1)-O(7) bond length is 2.66 Å. The Na(1)-O(8) bond length is 2.39 Å. There are two inequivalent Fe sites. In the first Fe site, Fe(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form FeO4 tetrahedra that share  a cornercorner with one Fe(2)O4 tetrahedra, corners with two equivalent P(1)O4 tetrahedra, and corners with two equivalent P(2)O4 tetrahedra. The Fe(1)-O(1) bond length is 2.03 Å. The Fe(1)-O(2) bond length is 2.07 Å. The Fe(1)-O(3) bond length is 2.02 Å. The Fe(1)-O(4) bond length is 1.99 Å. In the second Fe site, Fe(2) is bonded to one O(2), one O(5), one O(6), and one O(7) atom to form FeO4 tetrahedra that share  a cornercorner with one Fe(1)O4 tetrahedra,  a cornercorner with one P(1)O4 tetrahedra, and corners with three equivalent P(2)O4 tetrahedra. The Fe(2)-O(2) bond length is 2.09 Å. The Fe(2)-O(5) bond length is 2.02 Å. The Fe(2)-O(6) bond length is 2.00 Å. The Fe(2)-O(7) bond length is 2.03 Å. There are two inequivalent P sites. In the first P site, P(1) is bonded to one O(1), one O(3), one O(5), and one O(8) atom to form PO4 tetrahedra that share  a cornercorner with one Fe(2)O4 tetrahedra and corners with two equivalent Fe(1)O4 tetrahedra. The P(1)-O(1) bond length is 1.54 Å. The P(1)-O(3) bond length is 1.54 Å. The P(1)-O(5) bond length is 1.53 Å. The P(1)-O(8) bond length is 1.62 Å. In the second P site, P(2) is bonded to one O(2), one O(4), one O(6), and one O(7) atom to form PO4 tetrahedra that share corners with two equivalent Fe(1)O4 tetrahedra and corners with three equivalent Fe(2)O4 tetrahedra. The P(2)-O(2) bond length is 1.58 Å. The P(2)-O(4) bond length is 1.54 Å. The P(2)-O(6) bond length is 1.54 Å. The P(2)-O(7) bond length is 1.56 Å. H(1) is bonded in a single-bond geometry to one O(8) atom. The H(1)-O(8) bond length is 0.98 Å. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a trigonal planar geometry to one Na(1), one Fe(1), and one P(1) atom. In the second O site, O(2) is bonded in a trigonal planar geometry to one Fe(1), one Fe(2), and one P(2) atom. In the third O site, O(3) is bonded in a trigonal planar geometry to one Na(1), one Fe(1), and one P(1) atom. In the fourth O site, O(4) is bonded in a 3-coordinate geometry to one Na(1), one Fe(1), and one P(2) atom. In the fifth O site, O(5) is bonded in a distorted bent 120 degrees geometry to one Fe(2) and one P(1) atom. In the sixth O site, O(6) is bonded in a 2-coordinate geometry to one Na(1), one Fe(2), and one P(2) atom. In the seventh O site, O(7) is bonded in a 3-coordinate geometry to one Na(1), one Fe(2), and one P(2) atom. In the eighth O site, O(8) is bonded in a distorted trigonal planar geometry to one Na(1), one P(1), and one H(1) atom.