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AlH3 crystallizes in the trigonal R-3c space group. The structure is three-dimensional. Al3+ is bonded to six equivalent H1- atoms to form corner-sharing AlH6 octahedra. The corner-sharing octahedral tilt angles are 39°. All Al–H bond lengths are 1.72 Å. H1- is bonded in a bent 150 degrees geometry to two equivalent Al3+ atoms.
AlH3 crystallizes in the orthorhombic Pnnm space group. The structure is three-dimensional. there are two inequivalent Al3+ sites. In the first Al3+ site, Al3+ is bonded to six H1- atoms to form a mixture of edge and corner-sharing AlH6 octahedra. The corner-sharing octahedra tilt angles range from 0–46°. There are a spread of Al–H bond distances ranging from 1.69–1.77 Å. In the second Al3+ site, Al3+ is bonded to six H1- atoms to form corner-sharing AlH6 octahedra. The corner-sharing octahedra tilt angles range from 11–46°. There is four shorter (1.72 Å) and two longer (1.76 Å) Al–H bond length. There are four inequivalent H1- sites. In the first H1- site, H1- is bonded in a distorted bent 120 degrees geometry to two Al3+ atoms. In the second H1- site, H1- is bonded in a water-like geometry to two equivalent Al3+ atoms. In the third H1- site, H1- is bonded in a linear geometry to two Al3+ atoms. In the fourth H1- site, H1- is bonded in a linear geometry to two equivalent Al3+ atoms.
AlH3 crystallizes in the orthorhombic Cmcm space group. The structure is three-dimensional. there are two inequivalent Al3+ sites. In the first Al3+ site, Al3+ is bonded to six H1- atoms to form corner-sharing AlH6 octahedra. The corner-sharing octahedra tilt angles range from 38–44°. There are a spread of Al–H bond distances ranging from 1.72–1.74 Å. In the second Al3+ site, Al3+ is bonded to six H1- atoms to form corner-sharing AlH6 octahedra. The corner-sharing octahedra tilt angles range from 39–44°. There is four shorter (1.73 Å) and two longer (1.74 Å) Al–H bond length. There are four inequivalent H1- sites. In the first H1- site, H1- is bonded in a bent 150 degrees geometry to two Al3+ atoms. In the second H1- site, H1- is bonded in a bent 150 degrees geometry to two equivalent Al3+ atoms. In the third H1- site, H1- is bonded in a bent 150 degrees geometry to two equivalent Al3+ atoms. In the fourth H1- site, H1- is bonded in a bent 150 degrees geometry to two equivalent Al3+ atoms.
Al(H2)6 is alpha carbon monoxide-like structured and crystallizes in the cubic Fd-3m space group. The structure is zero-dimensional and consists of eight aluminum molecules and forty-eight hydrogen molecules.
AlH6 is Cyanogen Chloride-derived structured and crystallizes in the monoclinic C2/c space group. The structure is zero-dimensional and consists of four $l^{2}-alumane molecules and twelve hydrogen molecules.
(Al)6H2 is alpha bismuth trifluoride structured and crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional and consists of two hydrogen molecules and one Al framework. In the Al framework, there are two inequivalent Al sites. In the first Al site, Al is bonded in a 4-coordinate geometry to four equivalent Al atoms. All Al–Al bond lengths are 2.67 Å. In the second Al site, Al is bonded in a body-centered cubic geometry to eight equivalent Al atoms.
AlH3 crystallizes in the cubic Fd-3m space group. The structure is three-dimensional. Al3+ is bonded to six equivalent H1- atoms to form corner-sharing AlH6 octahedra. The corner-sharing octahedral tilt angles are 44°. All Al–H bond lengths are 1.72 Å. H1- is bonded in a bent 150 degrees geometry to two equivalent Al3+ atoms.