ZnH3(C2O)4 crystallizes in the monoclinic C2/c space group. Zn(1) is bonded in a tetrahedral geometry to one O(1), one O(2), one O(3), and one O(4) atom. The Zn(1)-O(1) bond length is 1.95 Å. The Zn(1)-O(2) bond length is 1.99 Å. The Zn(1)-O(3) bond length is 1.99 Å. The Zn(1)-O(4) bond length is 1.93 Å. There are eleven inequivalent C sites. In the first C site, C(1) is bonded in a distorted bent 120 degrees geometry to one C(2) and two equivalent O(1) atoms. The C(1)-C(2) bond length is 1.49 Å. Both C(1)-O(1) bond lengths are 1.28 Å. In the second C site, C(2) is bonded in a trigonal planar geometry to one C(1) and two equivalent C(3) atoms. Both C(2)-C(3) bond lengths are 1.40 Å. In the third 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 1.09 Å. In the fourth C site, C(4) is bonded in a distorted single-bond geometry to one C(5) and one H(2) atom. The C(4)-C(5) bond length is 1.41 Å. The C(4)-H(2) bond length is 1.09 Å. In the fifth C site, C(5) is bonded in a trigonal planar geometry to one C(6) and two equivalent C(4) atoms. The C(5)-C(6) bond length is 1.48 Å. In the sixth C site, C(6) is bonded in a trigonal planar geometry to one C(5) and two equivalent C(7) atoms. Both C(6)-C(7) bond lengths are 1.41 Å. In the seventh C site, C(7) is bonded in a trigonal planar geometry to one C(6), one C(8), and one C(9) atom. The C(7)-C(8) bond length is 1.50 Å. The C(7)-C(9) bond length is 1.40 Å. In the eighth C site, C(8) is bonded in a distorted bent 120 degrees geometry to one C(7), one O(2), and one O(3) atom. The C(8)-O(2) bond length is 1.27 Å. The C(8)-O(3) bond length is 1.28 Å. In the ninth C site, C(9) is bonded in a distorted single-bond geometry to one C(10), one C(7), and one H(3) atom. The C(9)-C(10) bond length is 1.40 Å. The C(9)-H(3) bond length is 1.09 Å. In the tenth C site, C(10) is bonded in a trigonal planar geometry to one C(11) and two equivalent C(9) atoms. The C(10)-C(11) bond length is 1.49 Å. In the eleventh C site, C(11) is bonded in a distorted bent 120 degrees geometry to one C(10) and two equivalent O(4) atoms. Both C(11)-O(4) bond lengths are 1.27 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(9) atom. There are four inequivalent O sites. In the first O site, O(1) is bonded in a bent 120 degrees geometry to one Zn(1) and one C(1) atom. In the second O site, O(2) is bonded in a distorted bent 120 degrees geometry to one Zn(1) and one C(8) atom. In the third O site, O(3) is bonded in a bent 120 degrees geometry to one Zn(1) and one C(8) atom. In the fourth O site, O(4) is bonded in a distorted bent 150 degrees geometry to one Zn(1) and one C(11) atom. Linkers: 2 [O]C(=O)c1ccc(-c2c(C([O])=O)cc(C([O])=O)cc2C([O])=O)cc1. Metal clusters: 4 [Zn]. The MOF has largest included sphere 2.44 A, density 1.97 g/cm3, surface area 3382.47 m2/g, accessible volume 0.13 cm3/g