Fe(CO2)3 crystallizes in the cubic I4_132 space group. Fe(1) is bonded in an octahedral geometry to six equivalent O(1) atoms. All Fe(1)-O(1) bond lengths are 2.13 Å. C(1) is bonded in a distorted bent 120 degrees geometry to two equivalent O(1) atoms. Both C(1)-O(1) bond lengths are 1.24 Å. O(1) is bonded in a bent 120 degrees geometry to one Fe(1) and one C(1) atom. Linkers: 12 [O]C(=O)C([O])=O. Metal clusters: 8 [Fe]. The MOF has largest included sphere 8.80 A, density 0.66 g/cm3, surface area 3332.60 m2/g, accessible volume 1.24 cm3/g