Fe2C3P2H2O14 crystallizes in the monoclinic P2_1/c space group. 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), one O(4), one O(5), and one O(6) atom to form FeO6 octahedra that share  a cornercorner with one P(1)O4 tetrahedra and  a cornercorner with one P(2)O4 tetrahedra. The Fe(1)-O(1) bond length is 1.89 Å. The Fe(1)-O(2) bond length is 1.91 Å. The Fe(1)-O(3) bond length is 2.05 Å. The Fe(1)-O(4) bond length is 2.06 Å. The Fe(1)-O(5) bond length is 2.10 Å. The Fe(1)-O(6) bond length is 2.09 Å. In the second Fe site, Fe(2) is bonded to one O(10), one O(11), one O(12), one O(7), one O(8), and one O(9) atom to form FeO6 octahedra that share corners with two equivalent P(1)O4 tetrahedra and corners with two equivalent P(2)O4 tetrahedra. The Fe(2)-O(10) bond length is 1.98 Å. The Fe(2)-O(11) bond length is 2.12 Å. The Fe(2)-O(12) bond length is 2.15 Å. The Fe(2)-O(7) bond length is 1.92 Å. The Fe(2)-O(8) bond length is 1.94 Å. The Fe(2)-O(9) bond length is 1.95 Å. There are three inequivalent C sites. In the first C site, C(1) is bonded in a distorted bent 120 degrees geometry to one O(4) and one O(6) atom. The C(1)-O(4) bond length is 1.26 Å. The C(1)-O(6) bond length is 1.28 Å. In the second C site, C(2) is bonded in a distorted bent 120 degrees geometry to one O(11) and one O(5) atom. The C(2)-O(11) bond length is 1.25 Å. The C(2)-O(5) bond length is 1.27 Å. In the third C site, C(3) is bonded in a distorted bent 120 degrees geometry to one O(12) and one O(3) atom. The C(3)-O(12) bond length is 1.24 Å. The C(3)-O(3) bond length is 1.26 Å. There are two inequivalent P sites. In the first P site, P(1) is bonded to one O(10), one O(13), one O(2), and one O(7) atom to form PO4 tetrahedra that share  a cornercorner with one Fe(1)O6 octahedra and corners with two equivalent Fe(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 32-39°. The P(1)-O(10) bond length is 1.50 Å. The P(1)-O(13) bond length is 1.56 Å. The P(1)-O(2) bond length is 1.52 Å. The P(1)-O(7) bond length is 1.50 Å. In the second P site, P(2) is bonded to one O(1), one O(14), one O(8), and one O(9) atom to form PO4 tetrahedra that share  a cornercorner with one Fe(1)O6 octahedra and corners with two equivalent Fe(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 32-40°. The P(2)-O(1) bond length is 1.53 Å. The P(2)-O(14) bond length is 1.57 Å. The P(2)-O(8) bond length is 1.52 Å. The P(2)-O(9) bond length is 1.51 Å. There are two inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one O(13) atom. The H(1)-O(13) bond length is 0.82 Å. In the second H site, H(2) is bonded in a single-bond geometry to one O(14) atom. The H(2)-O(14) bond length is 0.82 Å. There are fourteen inequivalent O sites. In the first O site, O(1) is bonded in a bent 150 degrees geometry to one Fe(1) and one P(2) atom. In the second O site, O(2) is bonded in a bent 150 degrees geometry to one Fe(1) and one P(1) atom. In the third O site, O(3) is bonded in a bent 120 degrees geometry to one Fe(1) and one C(3) atom. In the fourth O site, O(4) is bonded in a bent 120 degrees geometry to one Fe(1) and one C(1) atom. In the fifth O site, O(5) is bonded in a bent 120 degrees geometry to one Fe(1) and one C(2) atom. In the sixth O site, O(6) is bonded in a bent 120 degrees geometry to one Fe(1) and one C(1) atom. In the seventh O site, O(7) is bonded in a bent 150 degrees geometry to one Fe(2) and one P(1) atom. In the eighth O site, O(8) is bonded in a bent 150 degrees geometry to one Fe(2) and one P(2) atom. In the ninth O site, O(9) is bonded in a bent 150 degrees geometry to one Fe(2) and one P(2) atom. In the tenth O site, O(10) is bonded in a bent 150 degrees geometry to one Fe(2) and one P(1) atom. In the eleventh O site, O(11) is bonded in a bent 120 degrees geometry to one Fe(2) and one C(2) atom. In the twelfth O site, O(12) is bonded in a bent 120 degrees geometry to one Fe(2) and one C(3) atom. In the thirteenth O site, O(13) is bonded in a water-like geometry to one P(1) and one H(1) atom. In the fourteenth O site, O(14) is bonded in a water-like geometry to one P(2) and one H(2) atom. Linkers: 6 [O]C(=O)C([O])=O. Metal clusters: 8 [Fe]. The MOF has largest included sphere 4.36 A, density 1.75 g/cm3, surface area 2860.93 m2/g, accessible volume 0.22 cm3/g