ZnH3(C2O)4 crystallizes in the triclinic P-1 space group. There are two inequivalent Zn sites. In the first Zn site, Zn(1) is bonded in a 4-coordinate geometry to one O(1), one O(5), one O(6), and one O(8) atom. The Zn(1)-O(1) bond length is 2.24 Å. The Zn(1)-O(5) bond length is 2.05 Å. The Zn(1)-O(6) bond length is 1.97 Å. The Zn(1)-O(8) bond length is 1.94 Å. In the second Zn site, Zn(2) is bonded in a tetrahedral geometry to one O(2), one O(3), one O(4), and one O(7) atom. The Zn(2)-O(2) bond length is 1.98 Å. The Zn(2)-O(3) bond length is 1.92 Å. The Zn(2)-O(4) bond length is 1.96 Å. The Zn(2)-O(7) bond length is 1.93 Å. There are sixteen inequivalent C sites. In the first C site, C(1) is bonded in a distorted single-bond geometry to one C(5) and one H(1) atom. The C(1)-C(5) bond length is 1.40 Å. The C(1)-H(1) bond length is 0.93 Å. In the second C site, C(2) is bonded in a distorted bent 120 degrees geometry to one C(5), one O(2), and one O(4) atom. The C(2)-C(5) bond length is 1.48 Å. The C(2)-O(2) bond length is 1.27 Å. The C(2)-O(4) bond length is 1.25 Å. In the third C site, C(3) is bonded in a distorted single-bond geometry to one C(11) and one H(5) atom. The C(3)-C(11) bond length is 1.39 Å. The C(3)-H(5) bond length is 0.93 Å. In the fourth C site, C(4) is bonded in a trigonal planar geometry to one C(12), one C(14), and one C(5) atom. The C(4)-C(12) bond length is 1.38 Å. The C(4)-C(14) bond length is 1.48 Å. The C(4)-C(5) bond length is 1.42 Å. In the fifth C site, C(5) is bonded in a trigonal planar geometry to one C(1), one C(2), and one C(4) atom. In the sixth C site, C(6) is bonded in a distorted single-bond geometry to one C(11), one C(14), and one H(3) atom. The C(6)-C(11) bond length is 1.38 Å. The C(6)-C(14) bond length is 1.39 Å. The C(6)-H(3) bond length is 0.93 Å. In the seventh C site, C(7) is bonded in a trigonal planar geometry to one C(14), one C(15), and one C(9) atom. The C(7)-C(14) bond length is 1.42 Å. The C(7)-C(15) bond length is 1.52 Å. The C(7)-C(9) bond length is 1.38 Å. In the eighth C site, C(8) is bonded in a bent 120 degrees geometry to one C(10), one O(1), and one O(5) atom. The C(8)-C(10) bond length is 1.50 Å. The C(8)-O(1) bond length is 1.23 Å. The C(8)-O(5) bond length is 1.26 Å. In the ninth C site, C(9) is bonded in a single-bond geometry to one C(7) and one H(6) atom. The C(9)-H(6) bond length is 0.93 Å. In the tenth C site, C(10) is bonded in a trigonal planar geometry to one C(12), one C(13), and one C(8) atom. The C(10)-C(12) bond length is 1.40 Å. The C(10)-C(13) bond length is 1.36 Å. In the eleventh C site, C(11) is bonded in a trigonal planar geometry to one C(16), one C(3), and one C(6) atom. The C(11)-C(16) bond length is 1.51 Å. In the twelfth C site, C(12) is bonded in a distorted single-bond geometry to one C(10), one C(4), and one H(4) atom. The C(12)-H(4) bond length is 0.93 Å. In the thirteenth C site, C(13) is bonded in a distorted single-bond geometry to one C(10) and one H(2) atom. The C(13)-H(2) bond length is 0.93 Å. In the fourteenth C site, C(14) is bonded in a trigonal planar geometry to one C(4), one C(6), and one C(7) atom. In the fifteenth C site, C(15) is bonded in a distorted bent 120 degrees geometry to one C(7), one O(6), and one O(7) atom. The C(15)-O(6) bond length is 1.26 Å. The C(15)-O(7) bond length is 1.24 Å. In the sixteenth C site, C(16) is bonded in a distorted bent 120 degrees geometry to one C(11), one O(3), and one O(8) atom. The C(16)-O(3) bond length is 1.26 Å. The C(16)-O(8) bond length is 1.24 Å. There are six inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one C(1) atom. In the second H site, H(2) is bonded in a single-bond geometry to one C(13) atom. In the third H site, H(3) is bonded in a single-bond geometry to one C(6) atom. In the fourth H site, H(4) is bonded in a single-bond geometry to one C(12) atom. In the fifth H site, H(5) is bonded in a single-bond geometry to one C(3) atom. In the sixth H site, H(6) is bonded in a single-bond geometry to one C(9) atom. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a distorted L-shaped geometry to one Zn(1) and one C(8) atom. In the second O site, O(2) is bonded in a bent 120 degrees geometry to one Zn(2) and one C(2) atom. In the third O site, O(3) is bonded in a distorted bent 150 degrees geometry to one Zn(2) and one C(16) atom. In the fourth O site, O(4) is bonded in a distorted bent 120 degrees geometry to one Zn(2) and one C(2) atom. In the fifth O site, O(5) is bonded in an L-shaped geometry to one Zn(1) and one C(8) atom. In the sixth O site, O(6) is bonded in a bent 120 degrees geometry to one Zn(1) and one C(15) atom. In the seventh O site, O(7) is bonded in a distorted bent 150 degrees geometry to one Zn(2) and one C(15) atom. In the eighth O site, O(8) is bonded in a bent 150 degrees geometry to one Zn(1) and one C(16) atom. Linkers: 2 [O]C(=O)c1ccc(C([O])=O)c(-c2cc(C([O])=O)ccc2C([O])=O)c1. Metal clusters: 1 [C]1O[Zn]2(O1)O[C]O[Zn]1(O[C]O2)O[C]O[Zn]2(O[C]O[Zn]3(O[C]O3)O[C]O2)O[C]O1. RCSR code: flu. The MOF has largest included sphere 5.39 A, density 1.52 g/cm3, surface area 3581.45 m2/g, accessible volume 0.26 cm3/g