Ce2C5O12 crystallizes in the triclinic P-1 space group. There are two inequivalent Ce sites. In the first Ce site, Ce(1) is bonded in a 8-coordinate geometry to one O(1), one O(10), one O(11), one O(12), one O(3), one O(6), one O(7), and one O(8) atom. The Ce(1)-O(1) bond length is 2.44 Å. The Ce(1)-O(10) bond length is 2.50 Å. The Ce(1)-O(11) bond length is 2.54 Å. The Ce(1)-O(12) bond length is 2.57 Å. The Ce(1)-O(3) bond length is 2.50 Å. The Ce(1)-O(6) bond length is 2.67 Å. The Ce(1)-O(7) bond length is 2.52 Å. The Ce(1)-O(8) bond length is 2.52 Å. In the second Ce site, Ce(2) is bonded in a 10-coordinate geometry to one O(10), one O(11), one O(12), one O(2), one O(5), one O(6), two equivalent O(4), and two equivalent O(9) atoms. The Ce(2)-O(10) bond length is 2.45 Å. The Ce(2)-O(11) bond length is 2.59 Å. The Ce(2)-O(12) bond length is 2.96 Å. The Ce(2)-O(2) bond length is 2.49 Å. The Ce(2)-O(5) bond length is 2.51 Å. The Ce(2)-O(6) bond length is 2.56 Å. There is one shorter (2.58 Å) and one longer (2.67 Å) Ce(2)-O(4) bond length. There is one shorter (2.49 Å) and one longer (2.59 Å) Ce(2)-O(9) bond length. There are five inequivalent C sites. In the first C site, C(1) is bonded in a distorted bent 120 degrees geometry to one O(1) and one O(2) atom. The C(1)-O(1) bond length is 1.26 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 O(3) and one O(4) atom. The C(2)-O(3) bond length is 1.24 Å. The C(2)-O(4) bond length is 1.26 Å. In the third C site, C(3) is bonded in a distorted bent 120 degrees geometry to one O(5) and one O(6) atom. The C(3)-O(5) bond length is 1.24 Å. The C(3)-O(6) bond length is 1.27 Å. In the fourth C site, C(4) is bonded in a distorted bent 120 degrees geometry to one O(7) and one O(8) atom. The C(4)-O(7) bond length is 1.25 Å. The C(4)-O(8) bond length is 1.25 Å. In the fifth C site, C(5) is bonded in a trigonal planar geometry to one O(10), one O(11), and one O(9) atom. The C(5)-O(10) bond length is 1.28 Å. The C(5)-O(11) bond length is 1.28 Å. The C(5)-O(9) bond length is 1.27 Å. There are twelve inequivalent O sites. In the first O site, O(1) is bonded in a bent 120 degrees geometry to one Ce(1) and one C(1) atom. In the second O site, O(2) is bonded in a bent 120 degrees geometry to one Ce(2) and one C(1) atom. In the third O site, O(3) is bonded in a distorted bent 120 degrees geometry to one Ce(1) and one C(2) atom. In the fourth O site, O(4) is bonded in a distorted single-bond geometry to two equivalent Ce(2) and one C(2) atom. In the fifth O site, O(5) is bonded in a distorted bent 120 degrees geometry to one Ce(2) and one C(3) atom. In the sixth O site, O(6) is bonded in a distorted single-bond geometry to one Ce(1), one Ce(2), and one C(3) atom. In the seventh O site, O(7) is bonded in a bent 120 degrees geometry to one Ce(1) and one C(4) atom. In the eighth O site, O(8) is bonded in a bent 120 degrees geometry to one Ce(1) and one C(4) atom. In the ninth O site, O(9) is bonded in a distorted single-bond geometry to two equivalent Ce(2) and one C(5) atom. In the tenth O site, O(10) is bonded in a distorted single-bond geometry to one Ce(1), one Ce(2), and one C(5) atom. In the eleventh O site, O(11) is bonded in a distorted single-bond geometry to one Ce(1), one Ce(2), and one C(5) atom. In the twelfth O site, O(12) is bonded in a distorted L-shaped geometry to one Ce(1) and one Ce(2) atom. Linkers: 4 [O]C(=O)C([O])=O. Metal clusters: 4 [Ce]. The MOF has largest included sphere 4.47 A, density 2.65 g/cm3, surface area 1808.60 m2/g, accessible volume 0.12 cm3/g