Y3Pt2Ga9 crystallizes in the orthorhombic Immm space group. There are two inequivalent Y sites. In the first Y site, Y(1) is bonded to four equivalent Ga(3) and eight equivalent Ga(2) atoms to form distorted YGa12 cuboctahedra that share edges with two equivalent Ga(1)Y4Ga4Pt4 cuboctahedra and faces with two equivalent Y(1)Ga12 cuboctahedra. In the second Y site, Y(2) is bonded in a 14-coordinate geometry to two equivalent Pt(1), two equivalent Ga(1), four equivalent Ga(2), and six equivalent Ga(3) atoms. Pt(1) is bonded in a 10-coordinate geometry to two equivalent Y(2), two equivalent Ga(1), two equivalent Ga(2), and four equivalent Ga(3) atoms. There are three inequivalent Ga sites. In the first Ga site, Ga(1) is bonded to four equivalent Y(2), four equivalent Pt(1), and four equivalent Ga(3) atoms to form GaY4Ga4Pt4 cuboctahedra that share edges with two equivalent Y(1)Ga12 cuboctahedra and faces with two equivalent Ga(1)Y4Ga4Pt4 cuboctahedra. In the second Ga site, Ga(2) is bonded in a 9-coordinate geometry to two equivalent Y(1), two equivalent Y(2), one Pt(1), one Ga(2), and three equivalent Ga(3) atoms. In the third Ga site, Ga(3) is bonded in a 10-coordinate geometry to one Y(1), three equivalent Y(2), two equivalent Pt(1), one Ga(1), and three equivalent Ga(2) atoms.
Y3Pt2Ga9 crystallizes in the orthorhombic Immm space group. There are two inequivalent Y sites. In the first Y site, Y(1) is bonded to four equivalent Ga(3) and eight equivalent Ga(2) atoms to form distorted YGa12 cuboctahedra that share edges with two equivalent Ga(1)Y4Ga4Pt4 cuboctahedra and faces with two equivalent Y(1)Ga12 cuboctahedra. All Y(1)-Ga(3) bond lengths are 3.24 Å. All Y(1)-Ga(2) bond lengths are 3.17 Å. In the second Y site, Y(2) is bonded in a 14-coordinate geometry to two equivalent Pt(1), two equivalent Ga(1), four equivalent Ga(2), and six equivalent Ga(3) atoms. Both Y(2)-Pt(1) bond lengths are 3.09 Å. Both Y(2)-Ga(1) bond lengths are 3.26 Å. All Y(2)-Ga(2) bond lengths are 3.11 Å. There are four shorter (3.09 Å) and two longer (3.45 Å) Y(2)-Ga(3) bond lengths. Pt(1) is bonded in a 10-coordinate geometry to two equivalent Y(2), two equivalent Ga(1), two equivalent Ga(2), and four equivalent Ga(3) atoms. Both Pt(1)-Ga(1) bond lengths are 2.85 Å. Both Pt(1)-Ga(2) bond lengths are 2.60 Å. All Pt(1)-Ga(3) bond lengths are 2.77 Å. There are three inequivalent Ga sites. In the first Ga site, Ga(1) is bonded to four equivalent Y(2), four equivalent Pt(1), and four equivalent Ga(3) atoms to form GaY4Ga4Pt4 cuboctahedra that share edges with two equivalent Y(1)Ga12 cuboctahedra and faces with two equivalent Ga(1)Y4Ga4Pt4 cuboctahedra. All Ga(1)-Ga(3) bond lengths are 2.74 Å. In the second Ga site, Ga(2) is bonded in a 9-coordinate geometry to two equivalent Y(1), two equivalent Y(2), one Pt(1), one Ga(2), and three equivalent Ga(3) atoms. The Ga(2)-Ga(2) bond length is 2.54 Å. There are two shorter (2.61 Å) and one longer (2.71 Å) Ga(2)-Ga(3) bond length. In the third Ga site, Ga(3) is bonded in a 10-coordinate geometry to one Y(1), three equivalent Y(2), two equivalent Pt(1), one Ga(1), and three equivalent Ga(2) atoms.