Zn(C2O)4 crystallizes in the monoclinic Cc space group. There are three inequivalent Zn sites. In the first Zn site, Zn(1) is bonded in a trigonal non-coplanar geometry to one O(10), one O(2), and one O(4) atom. The Zn(1)-O(10) bond length is 1.93 Å. The Zn(1)-O(2) bond length is 2.05 Å. The Zn(1)-O(4) bond length is 1.94 Å. In the second Zn site, Zn(2) is bonded in a distorted trigonal non-coplanar geometry to one O(1), one O(3), and one O(8) atom. The Zn(2)-O(1) bond length is 1.95 Å. The Zn(2)-O(3) bond length is 1.97 Å. The Zn(2)-O(8) bond length is 1.96 Å. In the third Zn site, Zn(3) is bonded in a rectangular see-saw-like geometry to one O(5), one O(6), one O(7), and one O(9) atom. The Zn(3)-O(5) bond length is 1.99 Å. The Zn(3)-O(6) bond length is 2.09 Å. The Zn(3)-O(7) bond length is 2.03 Å. The Zn(3)-O(9) bond length is 2.07 Å. There are twenty-four inequivalent C sites. In the first C site, C(1) is bonded in a distorted bent 120 degrees geometry to one C(7), one O(2), and one O(7) atom. The C(1)-C(7) bond length is 1.50 Å. The C(1)-O(2) bond length is 1.21 Å. The C(1)-O(7) bond length is 1.23 Å. In the second C site, C(2) is bonded in a distorted bent 120 degrees geometry to one C(9), one O(1), and one O(9) atom. The C(2)-C(9) bond length is 1.52 Å. The C(2)-O(1) bond length is 1.29 Å. The C(2)-O(9) bond length is 1.26 Å. In the third C site, C(3) is bonded in a trigonal planar geometry to one C(11), one C(15), and one C(17) atom. The C(3)-C(11) bond length is 1.53 Å. The C(3)-C(15) bond length is 1.32 Å. The C(3)-C(17) bond length is 1.35 Å. In the fourth C site, C(4) is bonded in a trigonal planar geometry to one C(16), one C(19), and one C(8) atom. The C(4)-C(16) bond length is 1.43 Å. The C(4)-C(19) bond length is 1.43 Å. The C(4)-C(8) bond length is 1.43 Å. In the fifth C site, C(5) is bonded in a distorted trigonal planar geometry to one C(10), one C(21), and one C(24) atom. The C(5)-C(10) bond length is 1.46 Å. The C(5)-C(21) bond length is 1.44 Å. The C(5)-C(24) bond length is 1.38 Å. In the sixth C site, C(6) is bonded in a trigonal planar geometry to one C(12), one C(22), and one C(23) atom. The C(6)-C(12) bond length is 1.57 Å. The C(6)-C(22) bond length is 1.30 Å. The C(6)-C(23) bond length is 1.44 Å. In the seventh C site, C(7) is bonded in a trigonal planar geometry to one C(1), one C(14), and one C(18) atom. The C(7)-C(14) bond length is 1.28 Å. The C(7)-C(18) bond length is 1.32 Å. In the eighth C site, C(8) is bonded in a distorted bent 120 degrees geometry to one C(4), one O(4), and one O(6) atom. The C(8)-O(4) bond length is 1.25 Å. The C(8)-O(6) bond length is 1.27 Å. In the ninth C site, C(9) is bonded in a trigonal planar geometry to one C(13), one C(2), and one C(20) atom. The C(9)-C(13) bond length is 1.45 Å. The C(9)-C(20) bond length is 1.43 Å. In the tenth C site, C(10) is bonded in a distorted bent 120 degrees geometry to one C(5), one O(10), and one O(11) atom. The C(10)-O(10) bond length is 1.33 Å. The C(10)-O(11) bond length is 1.23 Å. In the eleventh C site, C(11) is bonded in a distorted bent 120 degrees geometry to one C(3), one O(3), and one O(5) atom. The C(11)-O(3) bond length is 1.29 Å. The C(11)-O(5) bond length is 1.23 Å. In the twelfth C site, C(12) is bonded in a distorted bent 120 degrees geometry to one C(6), one O(12), and one O(8) atom. The C(12)-O(12) bond length is 1.29 Å. The C(12)-O(8) bond length is 1.08 Å. In the thirteenth C site, C(13) is bonded in a bent 120 degrees geometry to one C(17) and one C(9) atom. The C(13)-C(17) bond length is 1.37 Å. In the fourteenth C site, C(14) is bonded in a bent 120 degrees geometry to one C(19) and one C(7) atom. The C(14)-C(19) bond length is 1.48 Å. In the fifteenth C site, C(15) is bonded in a distorted single-bond geometry to one C(3) atom. In the sixteenth C site, C(16) is bonded in a distorted single-bond geometry to one C(4) atom. In the seventeenth C site, C(17) is bonded in a bent 120 degrees geometry to one C(13) and one C(3) atom. In the eighteenth C site, C(18) is bonded in a distorted single-bond geometry to one C(7) atom. In the nineteenth C site, C(19) is bonded in a bent 120 degrees geometry to one C(14) and one C(4) atom. In the twentieth C site, C(20) is bonded in a single-bond geometry to one C(9) atom. In the twenty-first C site, C(21) is bonded in a single-bond geometry to one C(5) atom. In the twenty-second C site, C(22) is bonded in a bent 120 degrees geometry to one C(24) and one C(6) atom. The C(22)-C(24) bond length is 1.31 Å. In the twenty-third C site, C(23) is bonded in a single-bond geometry to one C(6) atom. In the twenty-fourth C site, C(24) is bonded in a single-bond geometry to one C(22) and one C(5) atom. There are twelve inequivalent O sites. In the first O site, O(1) is bonded in a bent 120 degrees geometry to one Zn(2) and one C(2) atom. In the second O site, O(2) is bonded in a bent 120 degrees geometry to one Zn(1) and one C(1) atom. In the third O site, O(3) is bonded in a bent 120 degrees geometry to one Zn(2) and one C(11) atom. In the fourth O site, O(4) is bonded in a bent 120 degrees geometry to one Zn(1) and one C(8) atom. In the fifth O site, O(5) is bonded in a bent 150 degrees geometry to one Zn(3) and one C(11) atom. In the sixth O site, O(6) is bonded in a distorted bent 120 degrees geometry to one Zn(3) and one C(8) atom. In the seventh O site, O(7) is bonded in a distorted bent 150 degrees geometry to one Zn(3) and one C(1) atom. In the eighth O site, O(8) is bonded in a bent 120 degrees geometry to one Zn(2) and one C(12) atom. In the ninth O site, O(9) is bonded in a distorted bent 120 degrees geometry to one Zn(3) and one C(2) atom. In the tenth O site, O(10) is bonded in a bent 120 degrees geometry to one Zn(1) and one C(10) atom. In the eleventh O site, O(11) is bonded in a single-bond geometry to one C(10) atom. In the twelfth O site, O(12) is bonded in a single-bond geometry to one C(12) atom. Linkers: 12 [O]C(=O)c1[c][c]c(C([O])=O)[c][c]1. Metal clusters: 4 [O][C]O[Zn]1O[C]O[Zn]2(O[C]O1)O[C]O[Zn](O[C]=O)O[C]O2. RCSR code: rob. The MOF has largest included sphere 7.30 A, density 0.75 g/cm3, surface area 4035.55 m2/g, accessible volume 0.82 cm3/g