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GeH4 is alpha carbon monoxide-like structured and crystallizes in the orthorhombic Cmcm space group. The structure is zero-dimensional and consists of four germanium molecules and eight hydrogen molecules.
(Ge)6H2 is alpha bismuth trifluoride structured and crystallizes in the cubic Fm-3m space group. The structure is three-dimensional and consists of four hydrogen molecules and one Ge framework. In the Ge framework, there are two inequivalent Ge sites. In the first Ge site, Ge is bonded to four equivalent Ge atoms to form a mixture of distorted edge and corner-sharing GeGe4 tetrahedra. All Ge–Ge bond lengths are 2.73 Å. In the second Ge site, Ge is bonded in a body-centered cubic geometry to eight equivalent Ge atoms.
GeH4 crystallizes in the orthorhombic Cmmm space group. The structure is two-dimensional and consists of two hydrogen molecules and one GeH2 sheet oriented in the (0, 0, 1) direction. In the GeH2 sheet, Ge2+ is bonded in a square co-planar geometry to four equivalent H+0.50- atoms. All Ge–H bond lengths are 1.79 Å. H+0.50- is bonded in a linear geometry to two equivalent Ge2+ atoms.
GeH4 crystallizes in the monoclinic P2_1/m space group. The structure is one-dimensional and consists of two hydrogen molecules and two GeH2 ribbons oriented in the (0, 0, 1) direction. In each GeH2 ribbon, Ge2+ is bonded in a bent 150 degrees geometry to two H+0.50- atoms. There are one shorter (2.17 Å) and one longer (2.18 Å) Ge–H bond lengths. There are two inequivalent H+0.50- sites. In the first H+0.50- site, H+0.50- is bonded in a single-bond geometry to one Ge2+ and one H+0.50- atom. The H–H bond length is 0.80 Å. In the second H+0.50- site, H+0.50- is bonded in a single-bond geometry to one Ge2+ and one H+0.50- atom.
GeH4 crystallizes in the monoclinic C2/c space group. The structure is one-dimensional and consists of four hydrogen molecules and two GeH2 ribbons oriented in the (0, 0, 1) direction. In each GeH2 ribbon, Ge2+ is bonded in a distorted rectangular see-saw-like geometry to four equivalent H+0.50- atoms. There is two shorter (1.68 Å) and two longer (2.00 Å) Ge–H bond length. H+0.50- is bonded in a water-like geometry to two equivalent Ge2+ atoms.