MnC9H4O7 crystallizes in the monoclinic C2/c space group. Mn(1) is bonded in a 7-coordinate geometry to one O(1), one O(2), one O(3), one O(6), one O(7), and two equivalent O(5) atoms. The Mn(1)-O(1) bond length is 2.28 Å. The Mn(1)-O(2) bond length is 2.19 Å. The Mn(1)-O(3) bond length is 2.13 Å. The Mn(1)-O(6) bond length is 2.30 Å. The Mn(1)-O(7) bond length is 2.16 Å. There is one shorter (2.12 Å) and one longer (2.68 Å) Mn(1)-O(5) bond length. There are nine inequivalent C sites. In the first C site, C(1) is bonded in a trigonal planar geometry to one C(4), one C(6), and one C(7) atom. The C(1)-C(4) bond length is 1.38 Å. The C(1)-C(6) bond length is 1.50 Å. The C(1)-C(7) bond length is 1.39 Å. In the second C site, C(2) is bonded in a trigonal planar geometry to one C(4), one C(8), and one C(9) atom. The C(2)-C(4) bond length is 1.38 Å. The C(2)-C(8) bond length is 1.50 Å. The C(2)-C(9) bond length is 1.39 Å. In the third C site, C(3) is bonded in a trigonal planar geometry to one C(5), one C(7), and one C(9) atom. The C(3)-C(5) bond length is 1.51 Å. The C(3)-C(7) bond length is 1.38 Å. The C(3)-C(9) bond length is 1.39 Å. In the fourth C site, C(4) is bonded in a distorted single-bond geometry to one C(1), one C(2), and one H(1) atom. The C(4)-H(1) bond length is 0.93 Å. In the fifth C site, C(5) is bonded in a distorted bent 120 degrees geometry to one C(3), one O(3), and one O(4) atom. The C(5)-O(3) bond length is 1.24 Å. The C(5)-O(4) bond length is 1.26 Å. In the sixth C site, C(6) is bonded in a bent 120 degrees geometry to one C(1), one O(2), and one O(5) atom. The C(6)-O(2) bond length is 1.25 Å. The C(6)-O(5) bond length is 1.24 Å. In the seventh C site, C(7) is bonded in a distorted single-bond geometry to one C(1), one C(3), and one H(3) atom. The C(7)-H(3) bond length is 0.93 Å. In the eighth C site, C(8) is bonded in a bent 120 degrees geometry to one C(2), one O(1), and one O(6) atom. The C(8)-O(1) bond length is 1.26 Å. The C(8)-O(6) bond length is 1.25 Å. In the ninth C site, C(9) is bonded in a single-bond geometry to one C(2), one C(3), and one H(4) atom. The C(9)-H(4) bond length is 0.93 Å. There are four inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one C(4) atom. In the second H site, H(2) is bonded in a single-bond geometry to one O(7) atom. The H(2)-O(7) bond length is 0.82 Å. In the third H site, H(3) is bonded in a single-bond geometry to one C(7) atom. In the fourth H site, H(4) is bonded in a single-bond geometry to one C(9) atom. There are seven inequivalent O sites. In the first O site, O(1) is bonded in an L-shaped geometry to one Mn(1) and one C(8) atom. In the second O site, O(2) is bonded in a water-like geometry to one Mn(1) and one C(6) atom. In the third O site, O(3) is bonded in a bent 150 degrees geometry to one Mn(1) and one C(5) atom. In the fourth O site, O(4) is bonded in a single-bond geometry to one C(5) atom. In the fifth O site, O(5) is bonded in a distorted linear geometry to two equivalent Mn(1) and one C(6) atom. In the sixth O site, O(6) is bonded in an L-shaped geometry to one Mn(1) and one C(8) atom. In the seventh O site, O(7) is bonded in a water-like geometry to one Mn(1) and one H(2) atom. Linkers: 7 [O]C(=O)c1cc(C([O])=O)cc(C([O])=O)c1 ,1 [O]C(=O)c1cc([C]=O)cc(C([O])=O)c1. Metal clusters: 4 O=[C]O[Mn]12(O)(O[C]O1)O[C]O[Mn]1(O)(O[C]=O)(O[C]O1)O[C]O2. The MOF has largest included sphere 5.80 A, density 1.09 g/cm3, surface area 3910.23 m2/g, accessible volume 0.49 cm3/g