Zn3H4(C5O4)4 crystallizes in the orthorhombic Fdd2 space group. There are three inequivalent Zn sites. In the first Zn site, Zn(1) is bonded in a tetrahedral geometry to one O(10), one O(11), one O(8), and one O(9) atom. The Zn(1)-O(10) bond length is 1.93 Å. The Zn(1)-O(11) bond length is 1.96 Å. The Zn(1)-O(8) bond length is 1.93 Å. The Zn(1)-O(9) bond length is 1.90 Å. In the second Zn site, Zn(2) is bonded in a tetrahedral geometry to one O(1), one O(13), one O(4), and one O(5) atom. The Zn(2)-O(1) bond length is 1.94 Å. The Zn(2)-O(13) bond length is 1.99 Å. The Zn(2)-O(4) bond length is 1.92 Å. The Zn(2)-O(5) bond length is 1.91 Å. In the third Zn site, Zn(3) is bonded in a tetrahedral geometry to one O(12), one O(14), one O(2), and one O(7) atom. The Zn(3)-O(12) bond length is 1.94 Å. The Zn(3)-O(14) bond length is 1.78 Å. The Zn(3)-O(2) bond length is 1.96 Å. The Zn(3)-O(7) bond length is 1.93 Å. There are twenty inequivalent C sites. In the first C site, C(17) is bonded in a distorted bent 120 degrees geometry to one C(12), one O(1), and one O(2) atom. The C(17)-C(12) bond length is 1.52 Å. The C(17)-O(1) bond length is 1.25 Å. The C(17)-O(2) bond length is 1.21 Å. In the second C site, C(18) is bonded in a trigonal planar geometry to one C(10), one C(19), and one C(9) atom. The C(18)-C(10) bond length is 1.39 Å. The C(18)-C(19) bond length is 1.50 Å. The C(18)-C(9) bond length is 1.39 Å. In the third C site, C(19) is bonded in a distorted bent 120 degrees geometry to one C(18), one O(11), and one O(12) atom. The C(19)-O(11) bond length is 1.28 Å. The C(19)-O(12) bond length is 1.22 Å. In the fourth C site, C(20) is bonded in a distorted bent 120 degrees geometry to one C(16), one O(13), and one O(14) atom. The C(20)-C(16) bond length is 1.51 Å. The C(20)-O(13) bond length is 1.12 Å. The C(20)-O(14) bond length is 1.27 Å. In the fifth C site, C(1) is bonded in a distorted bent 120 degrees geometry to one C(15), one O(16), and one O(9) atom. The C(1)-C(15) bond length is 1.53 Å. The C(1)-O(16) bond length is 1.19 Å. The C(1)-O(9) bond length is 1.17 Å. In the sixth C site, C(2) is bonded in a distorted bent 120 degrees geometry to one C(4), one O(7), and one O(8) atom. The C(2)-C(4) bond length is 1.51 Å. The C(2)-O(7) bond length is 1.26 Å. The C(2)-O(8) bond length is 1.26 Å. In the seventh C site, C(3) is bonded in a distorted single-bond geometry to one C(15), one C(4), and one H(1) atom. The C(3)-C(15) bond length is 1.41 Å. The C(3)-C(4) bond length is 1.37 Å. The C(3)-H(1) bond length is 0.93 Å. In the eighth C site, C(4) is bonded in a trigonal planar geometry to one C(2), one C(3), and one C(5) atom. The C(4)-C(5) bond length is 1.39 Å. In the ninth C site, C(5) is bonded in a trigonal planar geometry to one C(14), one C(4), and one C(6) atom. The C(5)-C(14) bond length is 1.38 Å. The C(5)-C(6) bond length is 1.51 Å. In the tenth 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 1.25 Å. The C(6)-O(6) bond length is 1.23 Å. In the eleventh C site, C(7) is bonded in a trigonal planar geometry to one C(10), one C(12), and one C(8) atom. The C(7)-C(10) bond length is 1.42 Å. The C(7)-C(12) bond length is 1.38 Å. The C(7)-C(8) bond length is 1.52 Å. In the twelfth C site, C(8) is bonded in a distorted bent 120 degrees geometry to one C(7), one O(10), and one O(15) atom. The C(8)-O(10) bond length is 1.25 Å. The C(8)-O(15) bond length is 1.23 Å. In the thirteenth C site, C(9) is bonded in a trigonal planar geometry to one C(11), one C(13), and one C(18) atom. The C(9)-C(11) bond length is 1.39 Å. The C(9)-C(13) bond length is 1.50 Å. In the fourteenth C site, C(10) is bonded in a distorted single-bond geometry to one C(18), one C(7), and one H(2) atom. The C(10)-H(2) bond length is 0.93 Å. In the fifteenth C site, C(11) is bonded in a distorted single-bond geometry to one C(12), one C(9), and one H(3) atom. The C(11)-C(12) bond length is 1.39 Å. The C(11)-H(3) bond length is 0.93 Å. In the sixteenth C site, C(12) is bonded in a trigonal planar geometry to one C(11), one C(17), and one C(7) atom. In the seventeenth C site, C(13) is bonded in a distorted bent 120 degrees geometry to one C(9), one O(3), and one O(4) atom. The C(13)-O(3) bond length is 1.24 Å. The C(13)-O(4) bond length is 1.26 Å. In the eighteenth C site, C(14) is bonded in a distorted single-bond geometry to one C(16), one C(5), and one H(4) atom. The C(14)-C(16) bond length is 1.39 Å. The C(14)-H(4) bond length is 0.93 Å. In the nineteenth C site, C(15) is bonded in a distorted trigonal planar geometry to one C(1), one C(16), and one C(3) atom. The C(15)-C(16) bond length is 1.36 Å. In the twentieth C site, C(16) is bonded in a distorted trigonal planar geometry to one C(14), one C(15), and one C(20) atom. There are four 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(10) atom. In the third H site, H(3) is bonded in a single-bond geometry to one C(11) atom. In the fourth H site, H(4) is bonded in a single-bond geometry to one C(14) atom. There are sixteen inequivalent O sites. In the first O site, O(1) is bonded in a distorted bent 150 degrees geometry to one Zn(2) and one C(17) atom. In the second O site, O(2) is bonded in a bent 120 degrees geometry to one Zn(3) and one C(17) atom. In the third O site, O(3) is bonded in a single-bond geometry to one C(13) atom. In the fourth O site, O(4) is bonded in a bent 120 degrees geometry to one Zn(2) and one C(13) atom. In the fifth O site, O(5) is bonded in a bent 120 degrees geometry to one Zn(2) and one C(6) atom. In the sixth O site, O(6) is bonded in a single-bond geometry to one C(6) atom. In the seventh O site, O(7) is bonded in a distorted bent 120 degrees geometry to one Zn(3) and one C(2) atom. In the eighth O site, O(8) is bonded in a distorted bent 150 degrees geometry to one Zn(1) and one C(2) atom. In the ninth O site, O(9) is bonded in a bent 120 degrees geometry to one Zn(1) and one C(1) atom. In the tenth O site, O(10) is bonded in a bent 120 degrees geometry to one Zn(1) and one C(8) atom. In the eleventh O site, O(11) is bonded in a bent 120 degrees geometry to one Zn(1) and one C(19) atom. In the twelfth O site, O(12) is bonded in a bent 150 degrees geometry to one Zn(3) and one C(19) atom. In the thirteenth O site, O(13) is bonded in a bent 150 degrees geometry to one Zn(2) and one C(20) atom. In the fourteenth O site, O(14) is bonded in a bent 150 degrees geometry to one Zn(3) and one C(20) atom. In the fifteenth O site, O(15) is bonded in a single-bond geometry to one C(8) atom. In the sixteenth O site, O(16) is bonded in a single-bond geometry to one C(1) atom. Linkers: 7 [O][C]c1cc(C([O])=O)c(C([O])=O)cc1C([O])=O ,15 [O]C(=O)c1cc(C([O])=O)c(C([O])=O)cc1[C]=O ,10 [O]C(=O)c1cc(C([O])=O)c(C([O])=O)cc1C([O])=O. Metal clusters: 16 O=[C]O[Zn]1(O[C]=O)O[C]O[Zn]2(O[C]O1)O[C]O[Zn](O[C]=O)(O[C]=O)O[C]O2. The MOF has largest included sphere 6.77 A, density 1.24 g/cm3, surface area 3383.07 m2/g, accessible volume 0.49 cm3/g