FeC4H2O3 crystallizes in the triclinic P1 space group. There are six inequivalent Fe sites. In the first Fe site, Fe(1) is bonded to one H(10), one O(1), one O(13), one O(14), one O(3), and one O(8) atom to form edge-sharing FeHO5 octahedra. The Fe(1)-H(10) bond length is 1.52 Å. The Fe(1)-O(1) bond length is 2.16 Å. The Fe(1)-O(13) bond length is 2.06 Å. The Fe(1)-O(14) bond length is 2.04 Å. The Fe(1)-O(3) bond length is 2.08 Å. The Fe(1)-O(8) bond length is 1.99 Å. In the second Fe site, Fe(2) is bonded to one H(11), one O(1), one O(14), one O(15), one O(2), and one O(9) atom to form edge-sharing FeHO5 octahedra. The Fe(2)-H(11) bond length is 1.52 Å. The Fe(2)-O(1) bond length is 2.07 Å. The Fe(2)-O(14) bond length is 1.98 Å. The Fe(2)-O(15) bond length is 1.97 Å. The Fe(2)-O(2) bond length is 2.26 Å. The Fe(2)-O(9) bond length is 2.04 Å. In the third Fe site, Fe(3) is bonded to one H(12), one O(13), one O(15), one O(2), one O(3), and one O(7) atom to form edge-sharing FeHO5 octahedra. The Fe(3)-H(12) bond length is 1.51 Å. The Fe(3)-O(13) bond length is 1.94 Å. The Fe(3)-O(15) bond length is 1.99 Å. The Fe(3)-O(2) bond length is 2.08 Å. The Fe(3)-O(3) bond length is 2.26 Å. The Fe(3)-O(7) bond length is 2.04 Å. In the fourth Fe site, Fe(4) is bonded to one H(7), one O(11), one O(16), one O(17), one O(4), and one O(6) atom to form edge-sharing FeHO5 octahedra. The Fe(4)-H(7) bond length is 1.52 Å. The Fe(4)-O(11) bond length is 1.99 Å. The Fe(4)-O(16) bond length is 2.05 Å. The Fe(4)-O(17) bond length is 2.03 Å. The Fe(4)-O(4) bond length is 2.18 Å. The Fe(4)-O(6) bond length is 2.08 Å. In the fifth Fe site, Fe(5) is bonded to one H(8), one O(12), one O(17), one O(18), one O(4), and one O(5) atom to form edge-sharing FeHO5 octahedra. The Fe(5)-H(8) bond length is 1.52 Å. The Fe(5)-O(12) bond length is 2.04 Å. The Fe(5)-O(17) bond length is 1.99 Å. The Fe(5)-O(18) bond length is 1.98 Å. The Fe(5)-O(4) bond length is 2.07 Å. The Fe(5)-O(5) bond length is 2.25 Å. In the sixth Fe site, Fe(6) is bonded to one H(9), one O(10), one O(16), one O(18), one O(5), and one O(6) atom to form edge-sharing FeHO5 octahedra. The Fe(6)-H(9) bond length is 1.51 Å. The Fe(6)-O(10) bond length is 2.03 Å. The Fe(6)-O(16) bond length is 1.95 Å. The Fe(6)-O(18) bond length is 2.00 Å. The Fe(6)-O(5) bond length is 2.08 Å. The Fe(6)-O(6) bond length is 2.25 Å. There are twenty-four inequivalent C sites. In the first C site, C(1) is bonded in a distorted bent 120 degrees geometry to one C(7), one O(1), and one O(7) atom. The C(1)-C(7) bond length is 1.48 Å. The C(1)-O(1) bond length is 1.30 Å. The C(1)-O(7) bond length is 1.27 Å. In the second C site, C(2) is bonded in a distorted bent 120 degrees geometry to one C(8), one O(2), and one O(8) atom. The C(2)-C(8) bond length is 1.48 Å. The C(2)-O(2) bond length is 1.28 Å. The C(2)-O(8) bond length is 1.28 Å. In the third C site, C(3) is bonded in a distorted bent 120 degrees geometry to one C(9), one O(3), and one O(9) atom. The C(3)-C(9) bond length is 1.49 Å. The C(3)-O(3) bond length is 1.29 Å. The C(3)-O(9) bond length is 1.27 Å. In the fourth C site, C(4) is bonded in a distorted bent 120 degrees geometry to one C(10), one O(10), and one O(4) atom. The C(4)-C(10) bond length is 1.48 Å. The C(4)-O(10) bond length is 1.27 Å. The C(4)-O(4) bond length is 1.30 Å. In the fifth C site, C(5) is bonded in a distorted bent 120 degrees geometry to one C(11), one O(11), and one O(5) atom. The C(5)-C(11) bond length is 1.48 Å. The C(5)-O(11) bond length is 1.28 Å. The C(5)-O(5) bond length is 1.28 Å. In the sixth C site, C(6) is bonded in a distorted bent 120 degrees geometry to one C(12), one O(12), and one O(6) atom. The C(6)-C(12) bond length is 1.49 Å. The C(6)-O(12) bond length is 1.27 Å. The C(6)-O(6) bond length is 1.29 Å. In the seventh C site, C(7) is bonded in a trigonal planar geometry to one C(1), one C(13), and one C(19) atom. The C(7)-C(13) bond length is 1.42 Å. The C(7)-C(19) bond length is 1.40 Å. In the eighth C site, C(8) is bonded in a trigonal planar geometry to one C(14), one C(2), and one C(20) atom. The C(8)-C(14) bond length is 1.43 Å. The C(8)-C(20) bond length is 1.40 Å. In the ninth C site, C(9) is bonded in a trigonal planar geometry to one C(15), one C(21), and one C(3) atom. The C(9)-C(15) bond length is 1.42 Å. The C(9)-C(21) bond length is 1.40 Å. In the tenth C site, C(10) is bonded in a trigonal planar geometry to one C(16), one C(22), and one C(4) atom. The C(10)-C(16) bond length is 1.42 Å. The C(10)-C(22) bond length is 1.40 Å. In the eleventh C site, C(11) is bonded in a trigonal planar geometry to one C(17), one C(23), and one C(5) atom. The C(11)-C(17) bond length is 1.43 Å. The C(11)-C(23) bond length is 1.40 Å. In the twelfth C site, C(12) is bonded in a trigonal planar geometry to one C(18), one C(24), and one C(6) atom. The C(12)-C(18) bond length is 1.42 Å. The C(12)-C(24) bond length is 1.40 Å. In the thirteenth C site, C(13) is bonded in a single-bond geometry to one C(22), one C(7), and one O(13) atom. The C(13)-C(22) bond length is 1.40 Å. The C(13)-O(13) bond length is 1.36 Å. In the fourteenth C site, C(14) is bonded in a single-bond geometry to one C(23), one C(8), and one O(14) atom. The C(14)-C(23) bond length is 1.40 Å. The C(14)-O(14) bond length is 1.36 Å. In the fifteenth C site, C(15) is bonded in a single-bond geometry to one C(24), one C(9), and one O(15) atom. The C(15)-C(24) bond length is 1.40 Å. The C(15)-O(15) bond length is 1.36 Å. In the sixteenth C site, C(16) is bonded in a single-bond geometry to one C(10), one C(19), and one O(16) atom. The C(16)-C(19) bond length is 1.40 Å. The C(16)-O(16) bond length is 1.36 Å. In the seventeenth C site, C(17) is bonded in a single-bond geometry to one C(11), one C(20), and one O(17) atom. The C(17)-C(20) bond length is 1.40 Å. The C(17)-O(17) bond length is 1.36 Å. In the eighteenth C site, C(18) is bonded in a single-bond geometry to one C(12), one C(21), and one O(18) atom. The C(18)-C(21) bond length is 1.40 Å. The C(18)-O(18) bond length is 1.36 Å. In the nineteenth C site, C(19) is bonded in a distorted trigonal planar geometry to one C(16), one C(7), and one H(1) atom. The C(19)-H(1) bond length is 1.09 Å. In the twentieth C site, C(20) is bonded in a distorted trigonal planar geometry to one C(17); one C(8); and one H(2,5) atom. The C(20)-H(2,5) bond length is 1.09 Å. In the twenty-first C site, C(21) is bonded in a distorted trigonal planar geometry to one C(18), one C(9), and one H(3) atom. The C(21)-H(3) bond length is 1.09 Å. In the twenty-second C site, C(22) is bonded in a distorted trigonal planar geometry to one C(10), one C(13), and one H(4) atom. The C(22)-H(4) bond length is 1.09 Å. In the twenty-third C site, C(23) is bonded in a distorted trigonal planar geometry to one C(11); one C(14); and one H(2,5) atom. The C(23)-H(2,5) bond length is 1.09 Å. In the twenty-fourth C site, C(24) is bonded in a distorted trigonal planar geometry to one C(12), one C(15), and one H(6) atom. The C(24)-H(6) bond length is 1.09 Å. There are eleven inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one C(19) atom. In the second H site, H(2,5) is bonded in a single-bond geometry to one C(20) atom. In the third H site, H(3) is bonded in a single-bond geometry to one C(21) atom. In the fourth H site, H(4) is bonded in a single-bond geometry to one C(22) atom. In the fifth H site, H(6) is bonded in a single-bond geometry to one C(24) atom. In the sixth H site, H(7) is bonded in a single-bond geometry to one Fe(4) atom. In the seventh H site, H(8) is bonded in a single-bond geometry to one Fe(5) atom. In the eighth H site, H(9) is bonded in a single-bond geometry to one Fe(6) atom. In the ninth H site, H(10) is bonded in a single-bond geometry to one Fe(1) atom. In the tenth H site, H(11) is bonded in a single-bond geometry to one Fe(2) atom. In the eleventh H site, H(12) is bonded in a single-bond geometry to one Fe(3) atom. There are eighteen 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 C(1) atom. In the second O site, O(2) is bonded in a 3-coordinate geometry to one Fe(2), one Fe(3), and one C(2) atom. In the third O site, O(3) is bonded in a 3-coordinate geometry to one Fe(1), one Fe(3), and one C(3) atom. In the fourth O site, O(4) is bonded in a 3-coordinate geometry to one Fe(4), one Fe(5), and one C(4) atom. In the fifth O site, O(5) is bonded in a 3-coordinate geometry to one Fe(5), one Fe(6), and one C(5) atom. In the sixth O site, O(6) is bonded in a 3-coordinate geometry to one Fe(4), one Fe(6), and one C(6) atom. In the seventh O site, O(7) is bonded in a bent 120 degrees geometry to one Fe(3) and one C(1) atom. In the eighth O site, O(8) is bonded in a bent 120 degrees geometry to one Fe(1) and one C(2) atom. In the ninth O site, O(9) is bonded in a bent 120 degrees geometry to one Fe(2) and one C(3) atom. In the tenth O site, O(10) is bonded in a bent 120 degrees geometry to one Fe(6) and one C(4) atom. In the eleventh O site, O(11) is bonded in a bent 120 degrees geometry to one Fe(4) and one C(5) atom. In the twelfth O site, O(12) is bonded in a bent 120 degrees geometry to one Fe(5) and one C(6) atom. In the thirteenth O site, O(13) is bonded in a distorted trigonal planar geometry to one Fe(1), one Fe(3), and one C(13) atom. In the fourteenth O site, O(14) is bonded in a distorted trigonal planar geometry to one Fe(1), one Fe(2), and one C(14) atom. In the fifteenth O site, O(15) is bonded in a distorted trigonal planar geometry to one Fe(2), one Fe(3), and one C(15) atom. In the sixteenth O site, O(16) is bonded in a distorted trigonal planar geometry to one Fe(4), one Fe(6), and one C(16) atom. In the seventeenth O site, O(17) is bonded in a distorted trigonal planar geometry to one Fe(4), one Fe(5), and one C(17) atom. In the eighteenth O site, O(18) is bonded in a distorted trigonal planar geometry to one Fe(5), one Fe(6), and one C(18) atom. Linkers: 3 [O]C(=O)c1cc([O])c(C([O])=O)cc1[O]. Metal clusters: 6 [Fe]. The MOF has largest included sphere 10.92 A, density 1.14 g/cm3, surface area 2502.55 m2/g, accessible volume 0.59 cm3/g