Na4PtPdH8 crystallizes in the monoclinic C2/m space group. There are two inequivalent Na sites. In the first Na site, Na(1) is bonded in a body-centered cubic geometry to two equivalent H(1) and six equivalent H(2) atoms. In the second Na site, Na(2) is bonded in a body-centered cubic geometry to two equivalent H(2) and six equivalent H(1) atoms. Pt(1) is bonded in a square co-planar geometry to four equivalent H(2) atoms. Pd(1) is bonded in a square co-planar geometry to four equivalent H(1) atoms. There are two inequivalent H sites. In the first H site, H(1) is bonded to one Na(1), three equivalent Na(2), and one Pd(1) atom to form HNa4Pd square pyramids that share corners with six equivalent H(2)Na4Pt square pyramids, corners with seven equivalent H(1)Na4Pd square pyramids, edges with three equivalent H(1)Na4Pd square pyramids, edges with three equivalent H(2)Na4Pt square pyramids, and faces with two equivalent H(1)Na4Pd square pyramids. In the second H site, H(2) is bonded to one Na(2), three equivalent Na(1), and one Pt(1) atom to form HNa4Pt square pyramids that share corners with six equivalent H(1)Na4Pd square pyramids, corners with seven equivalent H(2)Na4Pt square pyramids, edges with three equivalent H(1)Na4Pd square pyramids, edges with three equivalent H(2)Na4Pt square pyramids, and faces with two equivalent H(2)Na4Pt square pyramids.
Na4PtPdH8 crystallizes in the monoclinic C2/m space group. There are two inequivalent Na sites. In the first Na site, Na(1) is bonded in a body-centered cubic geometry to two equivalent H(1) and six equivalent H(2) atoms. Both Na(1)-H(1) bond lengths are 2.54 Å. There are four shorter (2.53 Å) and two longer (2.54 Å) Na(1)-H(2) bond lengths. In the second Na site, Na(2) is bonded in a body-centered cubic geometry to two equivalent H(2) and six equivalent H(1) atoms. Both Na(2)-H(2) bond lengths are 2.53 Å. There are four shorter (2.53 Å) and two longer (2.54 Å) Na(2)-H(1) 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 1.66 Å. Pd(1) is bonded in a square co-planar geometry to four equivalent H(1) atoms. All Pd(1)-H(1) bond lengths are 1.65 Å. There are two inequivalent H sites. In the first H site, H(1) is bonded to one Na(1), three equivalent Na(2), and one Pd(1) atom to form HNa4Pd square pyramids that share corners with six equivalent H(2)Na4Pt square pyramids, corners with seven equivalent H(1)Na4Pd square pyramids, edges with three equivalent H(1)Na4Pd square pyramids, edges with three equivalent H(2)Na4Pt square pyramids, and faces with two equivalent H(1)Na4Pd square pyramids. In the second H site, H(2) is bonded to one Na(2), three equivalent Na(1), and one Pt(1) atom to form HNa4Pt square pyramids that share corners with six equivalent H(1)Na4Pd square pyramids, corners with seven equivalent H(2)Na4Pt square pyramids, edges with three equivalent H(1)Na4Pd square pyramids, edges with three equivalent H(2)Na4Pt square pyramids, and faces with two equivalent H(2)Na4Pt square pyramids.