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(Rb)2PtH4 is Fluorite structured and crystallizes in the tetragonal P4_2/mnm space group. The structure is zero-dimensional and consists of two platinum tetrahydride molecules and four rubidium molecules.
Rb3PtH5 crystallizes in the tetragonal P4/mbm space group. The structure is three-dimensional. there are two inequivalent Rb1+ sites. In the first Rb1+ site, Rb1+ is bonded in a linear geometry to two equivalent H+0.20- atoms. Both Rb–H bond lengths are 3.02 Å. In the second Rb1+ site, Rb1+ is bonded in a 8-coordinate geometry to eight H+0.20- atoms. There are a spread of Rb–H bond distances ranging from 2.87–3.01 Å. Pt2- is bonded in a square co-planar geometry to four equivalent H+0.20- atoms. All Pt–H bond lengths are 1.67 Å. There are two inequivalent H+0.20- sites. In the first H+0.20- site, H+0.20- is bonded to six Rb1+ atoms to form corner-sharing HRb6 octahedra. The corner-sharing octahedra tilt angles range from 0–30°. In the second H+0.20- site, H+0.20- is bonded in a distorted rectangular see-saw-like geometry to three equivalent Rb1+ and one Pt2- atom.
(Rb)2PtH6 is Fluorite structured and crystallizes in the cubic Fm-3m space group. The structure is zero-dimensional and consists of eight rubidium molecules and four PtH6 clusters. In each PtH6 cluster, Pt2- is bonded in an octahedral geometry to six equivalent H atoms. All Pt–H bond lengths are 1.66 Å. H is bonded in a single-bond geometry to one Pt2- atom.