SrAlH5 crystallizes in the orthorhombic P2_12_12_1 space group. Sr(1) is bonded to one H(5), two equivalent H(1), three equivalent H(2), three equivalent H(3), and three equivalent H(4) atoms to form distorted SrH12 cuboctahedra that share corners with four equivalent Sr(1)H12 cuboctahedra, corners with two equivalent Al(1)H6 octahedra, edges with four equivalent Sr(1)H12 cuboctahedra,  an edgeedge with one Al(1)H6 octahedra, faces with two equivalent Sr(1)H12 cuboctahedra, and faces with three equivalent Al(1)H6 octahedra. The corner-sharing octahedral tilt angles range from 46-49°. Al(1) is bonded to one H(1), one H(2), one H(3), one H(4), and two equivalent H(5) atoms to form AlH6 octahedra that share corners with two equivalent Sr(1)H12 cuboctahedra, corners with two equivalent Al(1)H6 octahedra,  an edgeedge with one Sr(1)H12 cuboctahedra, and faces with three equivalent Sr(1)H12 cuboctahedra. The corner-sharing octahedral tilt angles are 42°. There are five inequivalent H sites. In the first H site, H(1) is bonded in a distorted single-bond geometry to two equivalent Sr(1) and one Al(1) atom. In the second H site, H(2) is bonded in a 1-coordinate geometry to three equivalent Sr(1) and one Al(1) atom. In the third H site, H(3) is bonded in a distorted single-bond geometry to three equivalent Sr(1) and one Al(1) atom. In the fourth H site, H(4) is bonded in a distorted single-bond geometry to three equivalent Sr(1) and one Al(1) atom. In the fifth H site, H(5) is bonded in a 2-coordinate geometry to one Sr(1) and two equivalent Al(1) atoms.
SrAlH5 crystallizes in the orthorhombic P2_12_12_1 space group. Sr(1) is bonded to one H(5), two equivalent H(1), three equivalent H(2), three equivalent H(3), and three equivalent H(4) atoms to form distorted SrH12 cuboctahedra that share corners with four equivalent Sr(1)H12 cuboctahedra, corners with two equivalent Al(1)H6 octahedra, edges with four equivalent Sr(1)H12 cuboctahedra,  an edgeedge with one Al(1)H6 octahedra, faces with two equivalent Sr(1)H12 cuboctahedra, and faces with three equivalent Al(1)H6 octahedra. The corner-sharing octahedral tilt angles range from 46-49°. The Sr(1)-H(5) bond length is 2.59 Å. There is one shorter (2.46 Å) and one longer (2.49 Å) Sr(1)-H(1) bond length. There are a spread of Sr(1)-H(2) bond distances ranging from 2.47-2.80 Å. There are a spread of Sr(1)-H(3) bond distances ranging from 2.54-2.69 Å. There are a spread of Sr(1)-H(4) bond distances ranging from 2.58-2.68 Å. Al(1) is bonded to one H(1), one H(2), one H(3), one H(4), and two equivalent H(5) atoms to form AlH6 octahedra that share corners with two equivalent Sr(1)H12 cuboctahedra, corners with two equivalent Al(1)H6 octahedra,  an edgeedge with one Sr(1)H12 cuboctahedra, and faces with three equivalent Sr(1)H12 cuboctahedra. The corner-sharing octahedral tilt angles are 42°. The Al(1)-H(1) bond length is 1.68 Å. The Al(1)-H(2) bond length is 1.72 Å. The Al(1)-H(3) bond length is 1.71 Å. The Al(1)-H(4) bond length is 1.73 Å. There is one shorter (1.76 Å) and one longer (1.80 Å) Al(1)-H(5) bond length. There are five inequivalent H sites. In the first H site, H(1) is bonded in a distorted single-bond geometry to two equivalent Sr(1) and one Al(1) atom. In the second H site, H(2) is bonded in a 1-coordinate geometry to three equivalent Sr(1) and one Al(1) atom. In the third H site, H(3) is bonded in a distorted single-bond geometry to three equivalent Sr(1) and one Al(1) atom. In the fourth H site, H(4) is bonded in a distorted single-bond geometry to three equivalent Sr(1) and one Al(1) atom. In the fifth H site, H(5) is bonded in a 2-coordinate geometry to one Sr(1) and two equivalent Al(1) atoms.