ZnH6(C3O)4 crystallizes in the monoclinic C2/c space group. Zn(1) is bonded in a distorted see-saw-like geometry to two equivalent O(1) and two equivalent O(2) atoms. Both Zn(1)-O(1) bond lengths are 2.09 Å. Both Zn(1)-O(2) bond lengths are 2.20 Å. There are six inequivalent C sites. In the first C site, C(5) is bonded in a trigonal planar geometry to one C(4), one C(5), and one C(6) atom. The C(5)-C(4) bond length is 1.27 Å. The C(5)-C(5) bond length is 1.37 Å. The C(5)-C(6) bond length is 1.45 Å. In the second C site, C(6) is bonded in a distorted single-bond geometry to one C(2), one C(5), and one H(3) atom. The C(6)-C(2) bond length is 1.33 Å. The C(6)-H(3) bond length is 0.93 Å. In the third 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 1.25 Å. The C(1)-O(2) bond length is 1.23 Å. In the fourth C site, C(2) is bonded in a trigonal planar geometry to one C(1), one C(3), and one C(6) atom. The C(2)-C(3) bond length is 1.33 Å. In the fifth C site, C(3) is bonded in a distorted single-bond geometry to one C(2) and one H(1) atom. The C(3)-H(1) bond length is 0.93 Å. In the sixth C site, C(4) is bonded in a distorted single-bond geometry to one C(5) and one H(2) atom. The C(4)-H(2) bond length is 0.93 Å. There are three inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one C(3) atom. In the second H site, H(2) is bonded in a single-bond geometry to one C(4) atom. In the third H site, H(3) is bonded in a single-bond geometry to one C(6) atom. There are two inequivalent O sites. In the first O site, O(1) is bonded in a distorted bent 150 degrees geometry to one Zn(1) and one C(1) atom. In the second O site, O(2) is bonded in a distorted single-bond geometry to one Zn(1) and one C(1) atom. Linkers: 4 [O]C(=O)c1ccc2cc(C([O])=O)ccc2c1. Metal clusters: 4 [Zn]. The MOF has largest included sphere 6.35 A, density 1.00 g/cm3, surface area 4047.15 m2/g, accessible volume 0.52 cm3/g