SrH2 crystallizes in the orthorhombic Cmcm space group. Sr(1) is bonded in a 11-coordinate geometry to five equivalent H(1) and six equivalent H(2) atoms. There are two inequivalent H sites. In the first H site, H(1) is bonded to five equivalent Sr(1) atoms to form distorted HSr5 trigonal bipyramids that share corners with twelve equivalent H(2)Sr6 octahedra, corners with eight equivalent H(1)Sr5 trigonal bipyramids, edges with six equivalent H(1)Sr5 trigonal bipyramids, and faces with six equivalent H(2)Sr6 octahedra. The corner-sharing octahedral tilt angles range from 31-60°. In the second H site, H(2) is bonded to six equivalent Sr(1) atoms to form HSr6 octahedra that share corners with twelve equivalent H(2)Sr6 octahedra, corners with twelve equivalent H(1)Sr5 trigonal bipyramids, edges with six equivalent H(2)Sr6 octahedra, faces with two equivalent H(2)Sr6 octahedra, and faces with six equivalent H(1)Sr5 trigonal bipyramids. The corner-sharing octahedral tilt angles range from 50-51°.
SrH2 crystallizes in the orthorhombic Cmcm space group. Sr(1) is bonded in a 11-coordinate geometry to five equivalent H(1) and six equivalent H(2) atoms. There are a spread of Sr(1)-H(1) bond distances ranging from 2.37-2.87 Å. There are four shorter (2.75 Å) and two longer (2.82 Å) Sr(1)-H(2) bond lengths. There are two inequivalent H sites. In the first H site, H(1) is bonded to five equivalent Sr(1) atoms to form distorted HSr5 trigonal bipyramids that share corners with twelve equivalent H(2)Sr6 octahedra, corners with eight equivalent H(1)Sr5 trigonal bipyramids, edges with six equivalent H(1)Sr5 trigonal bipyramids, and faces with six equivalent H(2)Sr6 octahedra. The corner-sharing octahedral tilt angles range from 31-60°. In the second H site, H(2) is bonded to six equivalent Sr(1) atoms to form HSr6 octahedra that share corners with twelve equivalent H(2)Sr6 octahedra, corners with twelve equivalent H(1)Sr5 trigonal bipyramids, edges with six equivalent H(2)Sr6 octahedra, faces with two equivalent H(2)Sr6 octahedra, and faces with six equivalent H(1)Sr5 trigonal bipyramids. The corner-sharing octahedral tilt angles range from 50-51°.