Fe2C3PO10 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 distorted FeO6 pentagonal pyramids that share  a cornercorner with one Fe(2)O6 octahedra, corners with two equivalent P(1)O4 tetrahedra, and  an edgeedge with one Fe(2)O6 octahedra. The corner-sharing octahedral tilt angles are 75°. The Fe(1)-O(1) bond length is 2.00 Å. The Fe(1)-O(2) bond length is 2.07 Å. The Fe(1)-O(3) bond length is 2.11 Å. The Fe(1)-O(4) bond length is 2.13 Å. The Fe(1)-O(5) bond length is 2.22 Å. The Fe(1)-O(6) bond length is 2.26 Å. In the second Fe site, Fe(2) is bonded to one O(3), one O(4), one O(6), one O(7), one O(8), and one O(9) atom to form distorted FeO6 octahedra that share  a cornercorner with one Fe(1)O6 pentagonal pyramid, corners with two equivalent P(1)O4 tetrahedra, and  an edgeedge with one Fe(1)O6 pentagonal pyramid. The Fe(2)-O(3) bond length is 2.20 Å. The Fe(2)-O(4) bond length is 2.12 Å. The Fe(2)-O(6) bond length is 2.53 Å. The Fe(2)-O(7) bond length is 1.97 Å. The Fe(2)-O(8) bond length is 2.12 Å. The Fe(2)-O(9) bond length is 2.13 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(2) and one O(8) atom. The C(1)-O(2) bond length is 1.24 Å. The C(1)-O(8) bond length is 1.25 Å. In the second C site, C(2) is bonded in a distorted bent 120 degrees geometry to one O(6) and one O(9) atom. The C(2)-O(6) bond length is 1.26 Å. The C(2)-O(9) bond length is 1.26 Å. In the third C site, C(3) is bonded in a distorted bent 120 degrees geometry to one O(3) and one O(5) atom. The C(3)-O(3) bond length is 1.27 Å. The C(3)-O(5) bond length is 1.24 Å. P(1) is bonded to one O(1), one O(10), one O(4), and one O(7) atom to form PO4 tetrahedra that share corners with two equivalent Fe(2)O6 octahedra and corners with two equivalent Fe(1)O6 pentagonal pyramids. The corner-sharing octahedral tilt angles range from 46-52°. The P(1)-O(1) bond length is 1.52 Å. The P(1)-O(10) bond length is 1.58 Å. The P(1)-O(4) bond length is 1.53 Å. The P(1)-O(7) bond length is 1.51 Å. There are ten inequivalent O sites. In the first O site, O(9) is bonded in a bent 120 degrees geometry to one Fe(2) and one C(2) atom. In the second O site, O(10) is bonded in a single-bond geometry to one P(1) atom. In the third O site, O(1) is bonded in a distorted bent 120 degrees geometry to one Fe(1) and one P(1) atom. In the fourth O site, O(2) is bonded in a bent 120 degrees geometry to one Fe(1) and one C(1) atom. In the fifth O site, O(3) is bonded in a distorted trigonal planar geometry to one Fe(1), one Fe(2), and one C(3) atom. In the sixth O site, O(4) is bonded in a distorted trigonal planar geometry to one Fe(1), one Fe(2), and one P(1) atom. In the seventh O site, O(5) is bonded in a bent 120 degrees geometry to one Fe(1) and one C(3) atom. In the eighth O site, O(6) is bonded in a distorted trigonal non-coplanar geometry to one Fe(1), one Fe(2), and one C(2) atom. In the ninth O site, O(7) is bonded in a distorted bent 120 degrees geometry to one Fe(2) and one P(1) atom. In the tenth O site, O(8) is bonded in a bent 120 degrees geometry to one Fe(2) and one C(1) atom. Linkers: 6 [O]C(=O)C([O])=O. Metal clusters: 8 [Fe]. The MOF has largest included sphere 3.78 A, density 2.13 g/cm3, surface area 2304.27 m2/g, accessible volume 0.17 cm3/g