Fe2C4HO9Cl2 crystallizes in the monoclinic Cc 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(8), one O(9), and one Cl(1) atom to form corner-sharing FeClO5 octahedra. The corner-sharing octahedral tilt angles are 46°. The Fe(1)-O(1) bond length is 1.93 Å. The Fe(1)-O(2) bond length is 2.12 Å. The Fe(1)-O(3) bond length is 2.06 Å. The Fe(1)-O(8) bond length is 2.09 Å. The Fe(1)-O(9) bond length is 2.05 Å. The Fe(1)-Cl(1) bond length is 2.26 Å. In the second Fe site, Fe(2) is bonded to one O(1), one O(4), one O(5), one O(6), one O(7), and one Cl(2) atom to form distorted corner-sharing FeClO5 octahedra. The corner-sharing octahedral tilt angles are 46°. The Fe(2)-O(1) bond length is 1.93 Å. The Fe(2)-O(4) bond length is 2.05 Å. The Fe(2)-O(5) bond length is 2.13 Å. The Fe(2)-O(6) bond length is 2.10 Å. The Fe(2)-O(7) bond length is 2.03 Å. The Fe(2)-Cl(2) bond length is 2.27 Å. There are four 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(4) atom. The C(1)-O(2) bond length is 1.26 Å. The C(1)-O(4) bond length is 1.24 Å. In the second C site, C(2) is bonded in a distorted bent 120 degrees geometry to one O(3) and one O(5) atom. The C(2)-O(3) bond length is 1.26 Å. The C(2)-O(5) bond length is 1.25 Å. In the third C site, C(3) is bonded in a distorted bent 120 degrees geometry to one O(6) and one O(9) atom. The C(3)-O(6) bond length is 1.25 Å. The C(3)-O(9) bond length is 1.25 Å. In the fourth C site, C(4) is bonded in a distorted bent 120 degrees geometry to one O(7) and one O(8) atom. The C(4)-O(7) bond length is 1.27 Å. The C(4)-O(8) bond length is 1.26 Å. H(1) is bonded in a single-bond geometry to one O(1) atom. The H(1)-O(1) bond length is 0.93 Å. There are nine inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal planar geometry to one Fe(1), one Fe(2), and one H(1) atom. In the second O site, O(2) is bonded in a bent 120 degrees geometry to one Fe(1) and one C(1) atom. In the third O site, O(3) is bonded in a bent 120 degrees geometry to one Fe(1) and one C(2) atom. In the fourth O site, O(4) is bonded in a bent 120 degrees geometry to one Fe(2) and one C(1) atom. In the fifth O site, O(5) is bonded in a bent 120 degrees geometry to one Fe(2) and one C(2) atom. In the sixth O site, O(6) is bonded in a bent 120 degrees geometry to one Fe(2) and one C(3) atom. In the seventh O site, O(7) is bonded in a bent 120 degrees geometry to one Fe(2) and one C(4) atom. In the eighth O site, O(8) is bonded in a water-like geometry to one Fe(1) and one C(4) atom. In the ninth O site, O(9) is bonded in a bent 120 degrees geometry to one Fe(1) and one C(3) atom. There are two inequivalent Cl sites. In the first Cl site, Cl(1) is bonded in a single-bond geometry to one Fe(1) atom. In the second Cl site, Cl(2) is bonded in a single-bond geometry to one Fe(2) atom. Linkers: 8 [O]C(=O)C([O])=O. Metal clusters: 8 [Fe]. The MOF has largest included sphere 4.29 A, density 1.50 g/cm3, surface area 3344.47 m2/g, accessible volume 0.34 cm3/g