NaZnC3H2O7 crystallizes in the monoclinic P2_1/c space group. Na(1) is bonded in a 7-coordinate geometry to one O(1), one O(2), one O(3), one O(4), one O(7), and two equivalent O(5) atoms. The Na(1)-O(1) bond length is 2.65 Å. The Na(1)-O(2) bond length is 2.38 Å. The Na(1)-O(3) bond length is 2.47 Å. The Na(1)-O(4) bond length is 2.35 Å. The Na(1)-O(7) bond length is 2.34 Å. There is one shorter (2.53 Å) and one longer (2.71 Å) Na(1)-O(5) bond length. Zn(1) is bonded in an octahedral geometry to one O(1), one O(2), one O(3), one O(5), one O(6), and one O(7) atom. The Zn(1)-O(1) bond length is 2.05 Å. The Zn(1)-O(2) bond length is 2.15 Å. The Zn(1)-O(3) bond length is 2.08 Å. The Zn(1)-O(5) bond length is 2.17 Å. The Zn(1)-O(6) bond length is 2.25 Å. The Zn(1)-O(7) bond length is 2.07 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(5) and one O(6) atom. The C(1)-O(5) bond length is 1.27 Å. The C(1)-O(6) bond length is 1.27 Å. In the second C site, C(2) is bonded in a distorted bent 120 degrees geometry to one O(4) and one O(7) atom. The C(2)-O(4) bond length is 1.26 Å. The C(2)-O(7) bond length is 1.27 Å. In the third C site, C(3) is bonded in a distorted bent 120 degrees geometry to one O(1) and one O(2) atom. The C(3)-O(1) bond length is 1.27 Å. The C(3)-O(2) bond length is 1.26 Å. There are two inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one O(3) and one O(6) atom. The H(1)-O(3) bond length is 1.00 Å. The H(1)-O(6) bond length is 1.75 Å. In the second H site, H(2) is bonded in a distorted single-bond geometry to one O(3) and one O(4) atom. The H(2)-O(3) bond length is 1.01 Å. The H(2)-O(4) bond length is 1.66 Å. There are seven inequivalent O sites. In the first O site, O(2) is bonded in a 3-coordinate geometry to one Na(1), one Zn(1), and one C(3) atom. In the second O site, O(3) is bonded in a distorted water-like geometry to one Na(1), one Zn(1), one H(1), and one H(2) atom. In the third O site, O(4) is bonded in a trigonal planar geometry to one Na(1), one C(2), and one H(2) atom. In the fourth O site, O(5) is bonded in a 4-coordinate geometry to two equivalent Na(1), one Zn(1), and one C(1) atom. In the fifth O site, O(6) is bonded in a 3-coordinate geometry to one Zn(1), one C(1), and one H(1) atom. In the sixth O site, O(7) is bonded in a distorted trigonal planar geometry to one Na(1), one Zn(1), and one C(2) atom. In the seventh O site, O(1) is bonded in a 3-coordinate geometry to one Na(1), one Zn(1), and one C(3) atom. Linkers: 6 [O]C(=O)C([O])=O. Metal clusters: 4 [Na] ,4 [Zn]. The MOF has largest included sphere 2.01 A, density 2.47 g/cm3, surface area 1993.51 m2/g, accessible volume 0.04 cm3/g