FeCl2(O)4 crystallizes in the monoclinic P2_1/c space group. Fe(1) is bonded in a distorted square co-planar geometry to two equivalent O(1), two equivalent O(2), and two equivalent Cl(1) atoms. There are two inequivalent O sites. In the first O site, O(2) is bonded in a bent 120 degrees geometry to one Fe(1) and one Cl(1) atom. In the second O site, O(1) is bonded in a bent 120 degrees geometry to one Fe(1) and one Cl(1) atom. Cl(1) is bonded in a distorted trigonal non-coplanar geometry to one Fe(1), one O(1), and one O(2) atom.
FeCl2(O)4 crystallizes in the monoclinic P2_1/c space group. Fe(1) is bonded in a distorted square co-planar geometry to two equivalent O(1), two equivalent O(2), and two equivalent Cl(1) atoms. Both Fe(1)-O(1) bond lengths are 2.09 Å. Both Fe(1)-O(2) bond lengths are 2.03 Å. Both Fe(1)-Cl(1) bond lengths are 2.88 Å. There are two inequivalent O sites. In the first O site, O(2) is bonded in a bent 120 degrees geometry to one Fe(1) and one Cl(1) atom. The O(2)-Cl(1) bond length is 1.58 Å. In the second O site, O(1) is bonded in a bent 120 degrees geometry to one Fe(1) and one Cl(1) atom. The O(1)-Cl(1) bond length is 1.58 Å. Cl(1) is bonded in a distorted trigonal non-coplanar geometry to one Fe(1), one O(1), and one O(2) atom.