LaCu3(CO2)9 crystallizes in the cubic P2_13 space group. La(1) is bonded in a distorted q6 geometry to three equivalent O(2), three equivalent O(4), and three equivalent O(6) atoms. All La(1)-O(2) bond lengths are 2.62 Å. All La(1)-O(4) bond lengths are 2.62 Å. All La(1)-O(6) bond lengths are 2.56 Å. Cu(1) is bonded in a rectangular see-saw-like geometry to one O(1), one O(5), and two equivalent O(3) atoms. The Cu(1)-O(1) bond length is 1.94 Å. The Cu(1)-O(5) bond length is 1.94 Å. There is one shorter (1.93 Å) and one longer (1.95 Å) Cu(1)-O(3) bond length. There are three inequivalent C sites. In the first C site, C(1) is bonded in a distorted trigonal planar geometry to one C(2), one O(1), and one O(2) atom. The C(1)-C(2) bond length is 1.53 Å. The C(1)-O(1) bond length is 1.24 Å. The C(1)-O(2) bond length is 1.25 Å. In the second C site, C(2) is bonded in a distorted bent 120 degrees geometry to one C(1), one C(3), one O(3), and one O(4) atom. The C(2)-C(3) bond length is 1.54 Å. The C(2)-O(3) bond length is 1.38 Å. The C(2)-O(4) bond length is 1.40 Å. In the third C site, C(3) is bonded in a distorted trigonal planar geometry to one C(2), one O(5), and one O(6) atom. The C(3)-O(5) bond length is 1.28 Å. The C(3)-O(6) bond length is 1.24 Å. There are six inequivalent O sites. In the first O site, O(1) is bonded in a water-like geometry to one Cu(1) and one C(1) atom. In the second O site, O(2) is bonded in a distorted bent 120 degrees geometry to one La(1) and one C(1) atom. In the third O site, O(3) is bonded in a trigonal non-coplanar geometry to two equivalent Cu(1) and one C(2) atom. In the fourth O site, O(4) is bonded in a distorted single-bond geometry to one La(1) and one C(2) atom. In the fifth O site, O(5) is bonded in a distorted water-like geometry to one Cu(1) and one C(3) atom. In the sixth O site, O(6) is bonded in a distorted bent 120 degrees geometry to one La(1) and one C(3) atom. Linkers: 12 [O]C(=O)C([O])([O])C([O])=O. Metal clusters: 4 [La] ,12 [Cu]. The MOF has largest included sphere 9.82 A, density 0.90 g/cm3, surface area 2529.13 m2/g, accessible volume 0.90 cm3/g