PbH4(C2O3)2 crystallizes in the monoclinic C2/c space group. There are three inequivalent Pb sites. In the first Pb site, Pb(1) is bonded in a 6-coordinate geometry to one O(1), one O(10), one O(2), one O(5), one O(6), and one O(9) atom. The Pb(1)-O(1) bond length is 2.47 Å. The Pb(1)-O(10) bond length is 2.80 Å. The Pb(1)-O(2) bond length is 2.47 Å. The Pb(1)-O(5) bond length is 2.64 Å. The Pb(1)-O(6) bond length is 2.64 Å. The Pb(1)-O(9) bond length is 2.80 Å. In the second Pb site, Pb(2) is bonded in a 6-coordinate geometry to two equivalent O(11), two equivalent O(3), and two equivalent O(7) atoms. Both Pb(2)-O(11) bond lengths are 2.80 Å. Both Pb(2)-O(3) bond lengths are 2.47 Å. Both Pb(2)-O(7) bond lengths are 2.64 Å. In the third Pb site, Pb(3) is bonded in a 6-coordinate geometry to two equivalent O(12), two equivalent O(4), and two equivalent O(8) atoms. Both Pb(3)-O(12) bond lengths are 2.81 Å. Both Pb(3)-O(4) bond lengths are 2.47 Å. Both Pb(3)-O(8) bond lengths are 2.64 Å. There are seven inequivalent C sites. In the first C site, C(1) is bonded in a distorted bent 120 degrees geometry to one O(5) and one O(9) atom. The C(1)-O(5) bond length is 1.28 Å. The C(1)-O(9) bond length is 1.27 Å. In the second C site, C(2) is bonded in a distorted bent 120 degrees geometry to one O(10) and one O(6) atom. The C(2)-O(10) bond length is 1.27 Å. The C(2)-O(6) bond length is 1.28 Å. In the third C site, C(3) is bonded in a distorted bent 120 degrees geometry to one O(11) and one O(7) atom. The C(3)-O(11) bond length is 1.27 Å. The C(3)-O(7) bond length is 1.28 Å. In the fourth C site, C(4) is bonded in a distorted bent 120 degrees geometry to one O(12) and one O(8) atom. The C(4)-O(12) bond length is 1.27 Å. The C(4)-O(8) bond length is 1.28 Å. In the fifth C site, C(5) is bonded in a distorted water-like geometry to one H(5,6,8) and one O(1) atom. The C(5)-H(5,6,8) bond length is 1.10 Å. The C(5)-O(1) bond length is 1.42 Å. In the sixth C site, C(6,8) is bonded in a distorted water-like geometry to one H(5,6,8) and one O(2) atom. The C(6,8)-H(5,6,8) bond length is 1.10 Å. The C(6,8)-O(2) bond length is 1.42 Å. In the seventh C site, C(7) is bonded in a distorted water-like geometry to one H(7) and one O(3) atom. The C(7)-H(7) bond length is 1.10 Å. The C(7)-O(3) bond length is 1.42 Å. There are five inequivalent H sites. In the first H site, H(1) is bonded in a linear geometry to one O(1) and one O(8) atom. The H(1)-O(1) bond length is 1.02 Å. The H(1)-O(8) bond length is 1.54 Å. In the second H site, H(2,4) is bonded in a linear geometry to one O(2) and one O(7) atom. The H(2,4)-O(2) bond length is 1.02 Å. The H(2,4)-O(7) bond length is 1.54 Å. In the third H site, H(3) is bonded in a linear geometry to one O(3) and one O(6) atom. The H(3)-O(3) bond length is 1.02 Å. The H(3)-O(6) bond length is 1.54 Å. In the fourth H site, H(5,6,8) is bonded in a single-bond geometry to one C(5) atom. In the fifth H site, H(7) is bonded in a single-bond geometry to one C(7) atom. There are twelve inequivalent O sites. In the first O site, O(1) is bonded in a distorted bent 120 degrees geometry to one Pb(1), one C(5), and one H(1) atom. In the second O site, O(2) is bonded in a distorted bent 120 degrees geometry to one Pb(1); one C(6,8); and one H(2,4) atom. In the third O site, O(3) is bonded in a distorted bent 120 degrees geometry to one Pb(2), one C(7), and one H(3) atom. In the fourth O site, O(4) is bonded in a distorted bent 120 degrees geometry to one Pb(3); one C(6,8); and one H(2,4) atom. The O(4)-C(6,8) bond length is 1.42 Å. The O(4)-H(2,4) bond length is 1.02 Å. In the fifth O site, O(5) is bonded in a distorted water-like geometry to one Pb(1); one C(1); and one H(2,4) atom. The O(5)-H(2,4) bond length is 1.54 Å. In the sixth O site, O(6) is bonded in a distorted water-like geometry to one Pb(1), one C(2), and one H(3) atom. In the seventh O site, O(7) is bonded in a distorted water-like geometry to one Pb(2); one C(3); and one H(2,4) atom. In the eighth O site, O(8) is bonded in a distorted water-like geometry to one Pb(3), one C(4), and one H(1) atom. In the ninth O site, O(9) is bonded in a single-bond geometry to one Pb(1) and one C(1) atom. In the tenth O site, O(10) is bonded in a single-bond geometry to one Pb(1) and one C(2) atom. In the eleventh O site, O(11) is bonded in a single-bond geometry to one Pb(2) and one C(3) atom. In the twelfth O site, O(12) is bonded in a single-bond geometry to one Pb(3) and one C(4) atom. Linkers: 4 [O]C(=O)[C@@H](O)[C@H](O)C([O])=O ,4 [O]C(=O)[C@H](O)[C@@H](O)C([O])=O. Metal clusters: 8 [Pb]. The MOF has largest included sphere 2.19 A, density 3.71 g/cm3, surface area 1415.66 m2/g, accessible volume 0.04 cm3/g