CrC8O5 crystallizes in the orthorhombic Pnma space group. Cr(1) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms to form corner-sharing CrO6 octahedra. The corner-sharing octahedral tilt angles are 58°. Both Cr(1)-O(1) bond lengths are 1.98 Å. Both Cr(1)-O(2) bond lengths are 1.96 Å. Both Cr(1)-O(3) bond lengths are 1.95 Å. There are six inequivalent C sites. In the first C site, C(1) is bonded in a bent 120 degrees geometry to one C(2) and one C(6) atom. The C(1)-C(2) bond length is 1.40 Å. The C(1)-C(6) bond length is 1.36 Å. In the second C site, C(2) is bonded in a bent 120 degrees geometry to one C(1) and one C(5) atom. The C(2)-C(5) bond length is 1.33 Å. In the third C site, C(3) is bonded in a distorted bent 120 degrees geometry to one C(5) and two equivalent O(2) atoms. The C(3)-C(5) bond length is 1.39 Å. Both C(3)-O(2) bond lengths are 1.30 Å. In the fourth C site, C(4) is bonded in a bent 120 degrees geometry to one C(6) and two equivalent O(1) atoms. The C(4)-C(6) bond length is 1.41 Å. Both C(4)-O(1) bond lengths are 1.30 Å. In the fifth C site, C(5) is bonded in a trigonal planar geometry to one C(3) and two equivalent C(2) atoms. In the sixth C site, C(6) is bonded in a trigonal planar geometry to one C(4) and two equivalent C(1) atoms. There are three inequivalent O sites. In the first O site, O(1) is bonded in a bent 150 degrees geometry to one Cr(1) and one C(4) atom. In the second O site, O(2) is bonded in a bent 150 degrees geometry to one Cr(1) and one C(3) atom. In the third O site, O(3) is bonded in a bent 120 degrees geometry to two equivalent Cr(1) atoms. Linkers: 4 [O]C(=O)c1[c][c]c(C([O])=O)[c][c]1. Metal clusters: 4 [Cr]. RCSR code: lvt. The MOF has largest included sphere 6.55 A, density 1.05 g/cm3, surface area 3445.09 m2/g, accessible volume 0.50 cm3/g