Eu5Sn3H crystallizes in the tetragonal I4/mcm space group. There are two inequivalent Eu sites. In the first Eu site, Eu(1) is bonded to two equivalent Sn(1) and four equivalent Sn(2) atoms to form distorted corner-sharing EuSn6 octahedra. The corner-sharing octahedral tilt angles range from 0-54°. In the second Eu site, Eu(2) is bonded in a distorted single-bond geometry to two equivalent Sn(1), three equivalent Sn(2), and one H(1) atom. There are two inequivalent Sn sites. In the first Sn site, Sn(1) is bonded in a 10-coordinate geometry to two equivalent Eu(1) and eight equivalent Eu(2) atoms. In the second Sn site, Sn(2) is bonded in a 9-coordinate geometry to two equivalent Eu(1), six equivalent Eu(2), and one Sn(2) atom. H(1) is bonded in a tetrahedral geometry to four equivalent Eu(2) atoms.
Eu5Sn3H crystallizes in the tetragonal I4/mcm space group. There are two inequivalent Eu sites. In the first Eu site, Eu(1) is bonded to two equivalent Sn(1) and four equivalent Sn(2) atoms to form distorted corner-sharing EuSn6 octahedra. The corner-sharing octahedral tilt angles range from 0-54°. Both Eu(1)-Sn(1) bond lengths are 3.81 Å. All Eu(1)-Sn(2) bond lengths are 3.34 Å. In the second Eu site, Eu(2) is bonded in a distorted single-bond geometry to two equivalent Sn(1), three equivalent Sn(2), and one H(1) atom. Both Eu(2)-Sn(1) bond lengths are 3.49 Å. There are two shorter (3.37 Å) and one longer (3.42 Å) Eu(2)-Sn(2) bond length. The Eu(2)-H(1) bond length is 2.47 Å. There are two inequivalent Sn sites. In the first Sn site, Sn(1) is bonded in a 10-coordinate geometry to two equivalent Eu(1) and eight equivalent Eu(2) atoms. In the second Sn site, Sn(2) is bonded in a 9-coordinate geometry to two equivalent Eu(1), six equivalent Eu(2), and one Sn(2) atom. The Sn(2)-Sn(2) bond length is 2.94 Å. H(1) is bonded in a tetrahedral geometry to four equivalent Eu(2) atoms.