Ga3Pt5 crystallizes in the orthorhombic Cmmm space group. There are three inequivalent Pt sites. In the first Pt site, Pt(1) is bonded in a distorted square co-planar geometry to four equivalent Pt(2) and four equivalent Ga(2) atoms. In the second Pt site, Pt(2) is bonded to two equivalent Pt(1), four equivalent Pt(3), two equivalent Ga(1), and four equivalent Ga(2) atoms to form a mixture of distorted corner and face-sharing PtGa6Pt6 cuboctahedra. In the third Pt site, Pt(3) is bonded in a 6-coordinate geometry to four equivalent Pt(2), two equivalent Ga(1), and four equivalent Ga(2) atoms. There are two inequivalent Ga sites. In the first Ga site, Ga(1) is bonded in a distorted body-centered cubic geometry to four equivalent Pt(2) and four equivalent Pt(3) atoms. In the second Ga site, Ga(2) is bonded in a 10-coordinate geometry to two equivalent Pt(1), four equivalent Pt(2), and four equivalent Pt(3) atoms.
Ga3Pt5 crystallizes in the orthorhombic Cmmm space group. There are three inequivalent Pt sites. In the first Pt site, Pt(1) is bonded in a distorted square co-planar geometry to four equivalent Pt(2) and four equivalent Ga(2) atoms. All Pt(1)-Pt(2) bond lengths are 2.74 Å. All Pt(1)-Ga(2) bond lengths are 2.62 Å. In the second Pt site, Pt(2) is bonded to two equivalent Pt(1), four equivalent Pt(3), two equivalent Ga(1), and four equivalent Ga(2) atoms to form a mixture of distorted corner and face-sharing PtGa6Pt6 cuboctahedra. All Pt(2)-Pt(3) bond lengths are 2.84 Å. Both Pt(2)-Ga(1) bond lengths are 2.74 Å. All Pt(2)-Ga(2) bond lengths are 2.75 Å. In the third Pt site, Pt(3) is bonded in a 6-coordinate geometry to four equivalent Pt(2), two equivalent Ga(1), and four equivalent Ga(2) atoms. Both Pt(3)-Ga(1) bond lengths are 2.52 Å. There are two shorter (2.77 Å) and two longer (2.79 Å) Pt(3)-Ga(2) bond lengths. There are two inequivalent Ga sites. In the first Ga site, Ga(1) is bonded in a distorted body-centered cubic geometry to four equivalent Pt(2) and four equivalent Pt(3) atoms. In the second Ga site, Ga(2) is bonded in a 10-coordinate geometry to two equivalent Pt(1), four equivalent Pt(2), and four equivalent Pt(3) atoms.