Fe2(CO)9 is Indium-like structured and crystallizes in the hexagonal P6_3/m space group. The structure is zero-dimensional and consists of two Fe2(CO)9 clusters. Fe(1) is bonded to three equivalent C(1) and three equivalent C(2) atoms to form face-sharing FeC6 octahedra. There are two inequivalent C sites. In the first C site, C(1) is bonded in a linear geometry to one Fe(1) and one O(1) atom. In the second C site, C(2) is bonded in a distorted single-bond geometry to two equivalent Fe(1) and one O(2) atom. There are two inequivalent O sites. In the first O site, O(1) is bonded in a single-bond geometry to one C(1) atom. In the second O site, O(2) is bonded in a single-bond geometry to one C(2) atom.
Fe2(CO)9 is Indium-like structured and crystallizes in the hexagonal P6_3/m space group. The structure is zero-dimensional and consists of two Fe2(CO)9 clusters. Fe(1) is bonded to three equivalent C(1) and three equivalent C(2) atoms to form face-sharing FeC6 octahedra. All Fe(1)-C(1) bond lengths are 1.82 Å. All Fe(1)-C(2) bond lengths are 2.01 Å. There are two inequivalent C sites. In the first C site, C(1) is bonded in a linear geometry to one Fe(1) and one O(1) atom. The C(1)-O(1) bond length is 1.16 Å. In the second C site, C(2) is bonded in a distorted single-bond geometry to two equivalent Fe(1) and one O(2) atom. The C(2)-O(2) bond length is 1.18 Å. There are two inequivalent O sites. In the first O site, O(1) is bonded in a single-bond geometry to one C(1) atom. In the second O site, O(2) is bonded in a single-bond geometry to one C(2) atom.