FeH4 crystallizes in the monoclinic P2_1/m space group. Fe(1) is bonded in a 9-coordinate geometry to three equivalent H(2), four equivalent H(1), and four equivalent H(3) atoms. There are three inequivalent H sites. In the first H site, H(3) is bonded in a distorted square co-planar geometry to four equivalent Fe(1) atoms. In the second H site, H(1) is bonded in a distorted bent 120 degrees geometry to two equivalent Fe(1) atoms. In the third H site, H(2) is bonded in a 3-coordinate geometry to three equivalent Fe(1) atoms.
FeH4 crystallizes in the monoclinic P2_1/m space group. Fe(1) is bonded in a 9-coordinate geometry to three equivalent H(2), four equivalent H(1), and four equivalent H(3) atoms. There is one shorter (1.59 Å) and two longer (1.89 Å) Fe(1)-H(2) bond lengths. There are two shorter (1.60 Å) and two longer (1.73 Å) Fe(1)-H(1) bond lengths. There are two shorter (1.83 Å) and two longer (2.12 Å) Fe(1)-H(3) bond lengths. There are three inequivalent H sites. In the first H site, H(3) is bonded in a distorted square co-planar geometry to four equivalent Fe(1) atoms. In the second H site, H(1) is bonded in a distorted bent 120 degrees geometry to two equivalent Fe(1) atoms. In the third H site, H(2) is bonded in a 3-coordinate geometry to three equivalent Fe(1) atoms.