FeH2(CN2)2 crystallizes in the orthorhombic Pnnm space group. Fe(1) is bonded to two equivalent N(2) and four equivalent N(1) atoms to form edge-sharing FeN6 octahedra. C(1) is bonded in a linear geometry to one N(1) and one N(2) atom. There are two inequivalent N sites. In the first N site, N(1) is bonded to two equivalent Fe(1), one C(1), and one H(1) atom to form a mixture of distorted corner and edge-sharing NFe2HC tetrahedra. In the second N site, N(2) is bonded in a linear geometry to one Fe(1) and one C(1) atom. H(1) is bonded in a single-bond geometry to one N(1) atom.
FeH2(CN2)2 crystallizes in the orthorhombic Pnnm space group. Fe(1) is bonded to two equivalent N(2) and four equivalent N(1) atoms to form edge-sharing FeN6 octahedra. Both Fe(1)-N(2) bond lengths are 1.88 Å. All Fe(1)-N(1) bond lengths are 2.08 Å. C(1) is bonded in a linear geometry to one N(1) and one N(2) atom. The C(1)-N(1) bond length is 1.32 Å. The C(1)-N(2) bond length is 1.18 Å. There are two inequivalent N sites. In the first N site, N(1) is bonded to two equivalent Fe(1), one C(1), and one H(1) atom to form a mixture of distorted corner and edge-sharing NFe2HC tetrahedra. The N(1)-H(1) bond length is 1.03 Å. In the second N site, N(2) is bonded in a linear geometry to one Fe(1) and one C(1) atom. H(1) is bonded in a single-bond geometry to one N(1) atom.