Cs3PtH5 crystallizes in the tetragonal P4/mbm space group. There are two inequivalent Cs sites. In the first Cs site, Cs(1) is bonded in a linear geometry to two equivalent H(1) atoms. In the second Cs site, Cs(2) is bonded in a 8-coordinate geometry to two equivalent H(1) and six equivalent H(2) atoms. Pt(1) is bonded in a square co-planar geometry to four equivalent H(2) atoms. There are two inequivalent H sites. In the first H site, H(1) is bonded to two equivalent Cs(1) and four equivalent Cs(2) atoms to form corner-sharing HCs6 octahedra. The corner-sharing octahedral tilt angles range from 0-29°. In the second H site, H(2) is bonded in a distorted rectangular see-saw-like geometry to three equivalent Cs(2) and one Pt(1) atom.
Cs3PtH5 crystallizes in the tetragonal P4/mbm space group. There are two inequivalent Cs sites. In the first Cs site, Cs(1) is bonded in a linear geometry to two equivalent H(1) atoms. Both Cs(1)-H(1) bond lengths are 3.12 Å. In the second Cs site, Cs(2) is bonded in a 8-coordinate geometry to two equivalent H(1) and six equivalent H(2) atoms. Both Cs(2)-H(1) bond lengths are 2.98 Å. There are four shorter (3.13 Å) and two longer (3.15 Å) Cs(2)-H(2) bond lengths. Pt(1) is bonded in a square co-planar geometry to four equivalent H(2) atoms. All Pt(1)-H(2) bond lengths are 1.65 Å. There are two inequivalent H sites. In the first H site, H(1) is bonded to two equivalent Cs(1) and four equivalent Cs(2) atoms to form corner-sharing HCs6 octahedra. The corner-sharing octahedral tilt angles range from 0-29°. In the second H site, H(2) is bonded in a distorted rectangular see-saw-like geometry to three equivalent Cs(2) and one Pt(1) atom.