Na2C12H6O13 crystallizes in the monoclinic C2/c space group. Na(1) is bonded in a 6-coordinate geometry to one O(2), one O(3), one O(5), one O(7), and two equivalent O(1) atoms. The Na(1)-O(2) bond length is 2.69 Å. The Na(1)-O(3) bond length is 2.31 Å. The Na(1)-O(5) bond length is 2.39 Å. The Na(1)-O(7) bond length is 2.49 Å. There is one shorter (2.31 Å) and one longer (2.45 Å) Na(1)-O(1) bond length. There are six inequivalent C sites. In the first C site, C(1) is bonded in a distorted bent 120 degrees geometry to one C(2), one O(1), and one O(2) atom. The C(1)-C(2) bond length is 1.52 Å. The C(1)-O(1) bond length is 1.24 Å. The C(1)-O(2) bond length is 1.31 Å. In the second C site, C(2) is bonded in a trigonal planar geometry to one C(1), one C(3), and one C(5) atom. The C(2)-C(3) bond length is 1.41 Å. The C(2)-C(5) bond length is 1.40 Å. In the third C site, C(3) is bonded in a trigonal planar geometry to one C(2), one C(4), and one C(5) atom. The C(3)-C(4) bond length is 1.50 Å. The C(3)-C(5) bond length is 1.40 Å. In the fourth C site, C(4) is bonded in a distorted bent 120 degrees geometry to one C(3), one O(3), and one O(4) atom. The C(4)-O(3) bond length is 1.24 Å. The C(4)-O(4) bond length is 1.32 Å. In the fifth C site, C(5) is bonded in a trigonal planar geometry to one C(2), one C(3), and one C(6) atom. The C(5)-C(6) bond length is 1.51 Å. In the sixth C site, C(6) is bonded in a distorted bent 120 degrees geometry to one C(5), one O(5), and one O(6) atom. The C(6)-O(5) bond length is 1.24 Å. The C(6)-O(6) bond length is 1.30 Å. There are three inequivalent H sites. In the first H site, H(1) is bonded in a linear geometry to one O(4) and one O(6) atom. The H(1)-O(4) bond length is 1.04 Å. The H(1)-O(6) bond length is 1.51 Å. In the second H site, H(2) is bonded in a linear geometry to one O(2) and one O(6) atom. The H(2)-O(2) bond length is 1.08 Å. The H(2)-O(6) bond length is 1.39 Å. In the third H site, H(3) is bonded in a single-bond geometry to one O(7) atom. The H(3)-O(7) bond length is 0.97 Å. There are seven inequivalent O sites. In the first O site, O(5) is bonded in a bent 120 degrees geometry to one Na(1) and one C(6) atom. In the second O site, O(6) is bonded in a trigonal planar geometry to one C(6), one H(1), and one H(2) atom. In the third O site, O(7) is bonded in a distorted water-like geometry to two equivalent Na(1) and two equivalent H(3) atoms. In the fourth O site, O(1) is bonded in a 3-coordinate geometry to two equivalent Na(1) and one C(1) atom. In the fifth O site, O(2) is bonded in a distorted bent 120 degrees geometry to one Na(1), one C(1), and one H(2) atom. In the sixth O site, O(3) is bonded in a distorted linear geometry to one Na(1) and one C(4) atom. In the seventh O site, O(4) is bonded in a water-like geometry to one C(4) and one H(1) atom. Linkers: 2 [O]C(=O)c1c(C(=O)O)c(C(=O)O)c(C([O])=O)c(C(=O)O)c1C(=O)O ,2 [O][C]c1c(C([O])=O)c(C(=O)O)c(C([O])=O)c(C(=O)O)c1C(=O)O. Metal clusters: 4 [Na]. The MOF has largest included sphere 2.11 A, density 1.85 g/cm3, surface area 3020.72 m2/g, accessible volume 0.07 cm3/g