Sr5As3H crystallizes in the hexagonal P6_3/mcm space group. There are two inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 5-coordinate geometry to three equivalent As(1) and two equivalent H(1) atoms. In the second Sr site, Sr(2) is bonded to six equivalent As(1) atoms to form a mixture of distorted face, corner, and edge-sharing SrAs6 octahedra. The corner-sharing octahedral tilt angles are 34°. As(1) is bonded in a 7-coordinate geometry to three equivalent Sr(1) and four equivalent Sr(2) atoms. H(1) is bonded to six equivalent Sr(1) atoms to form face-sharing HSr6 octahedra.
Sr5As3H crystallizes in the hexagonal P6_3/mcm space group. There are two inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 5-coordinate geometry to three equivalent As(1) and two equivalent H(1) atoms. There are two shorter (3.08 Å) and one longer (3.22 Å) Sr(1)-As(1) bond length. Both Sr(1)-H(1) bond lengths are 2.86 Å. In the second Sr site, Sr(2) is bonded to six equivalent As(1) atoms to form a mixture of distorted face, corner, and edge-sharing SrAs6 octahedra. The corner-sharing octahedral tilt angles are 34°. All Sr(2)-As(1) bond lengths are 3.29 Å. As(1) is bonded in a 7-coordinate geometry to three equivalent Sr(1) and four equivalent Sr(2) atoms. H(1) is bonded to six equivalent Sr(1) atoms to form face-sharing HSr6 octahedra.