LaPtNi4 crystallizes in the orthorhombic Cmmm space group. La(1) is bonded in a 18-coordinate geometry to four equivalent Pt(1), six equivalent Ni(1), and eight equivalent Ni(2) atoms. Pt(1) is bonded to four equivalent La(1), four equivalent Ni(1), and four equivalent Ni(2) atoms to form PtLa4Ni8 cuboctahedra that share corners with eight equivalent Pt(1)La4Ni8 cuboctahedra, corners with eight equivalent Ni(2)La4Ni6Pt2 cuboctahedra, edges with two equivalent Pt(1)La4Ni8 cuboctahedra, edges with eight equivalent Ni(2)La4Ni6Pt2 cuboctahedra, faces with two equivalent Pt(1)La4Ni8 cuboctahedra, and faces with eight equivalent Ni(2)La4Ni6Pt2 cuboctahedra. There are two inequivalent Ni sites. In the first Ni site, Ni(1) is bonded in a 11-coordinate geometry to three equivalent La(1), two equivalent Pt(1), two equivalent Ni(1), and four equivalent Ni(2) atoms. In the second Ni site, Ni(2) is bonded to four equivalent La(1), two equivalent Pt(1), two equivalent Ni(2), and four equivalent Ni(1) atoms to form distorted NiLa4Ni6Pt2 cuboctahedra that share corners with four equivalent Pt(1)La4Ni8 cuboctahedra, corners with twelve equivalent Ni(2)La4Ni6Pt2 cuboctahedra, edges with four equivalent Pt(1)La4Ni8 cuboctahedra, edges with six equivalent Ni(2)La4Ni6Pt2 cuboctahedra, faces with four equivalent Pt(1)La4Ni8 cuboctahedra, and faces with six equivalent Ni(2)La4Ni6Pt2 cuboctahedra.
LaPtNi4 crystallizes in the orthorhombic Cmmm space group. La(1) is bonded in a 18-coordinate geometry to four equivalent Pt(1), six equivalent Ni(1), and eight equivalent Ni(2) atoms. All La(1)-Pt(1) bond lengths are 3.17 Å. There are two shorter (2.88 Å) and four longer (2.96 Å) La(1)-Ni(1) bond lengths. All La(1)-Ni(2) bond lengths are 3.27 Å. Pt(1) is bonded to four equivalent La(1), four equivalent Ni(1), and four equivalent Ni(2) atoms to form PtLa4Ni8 cuboctahedra that share corners with eight equivalent Pt(1)La4Ni8 cuboctahedra, corners with eight equivalent Ni(2)La4Ni6Pt2 cuboctahedra, edges with two equivalent Pt(1)La4Ni8 cuboctahedra, edges with eight equivalent Ni(2)La4Ni6Pt2 cuboctahedra, faces with two equivalent Pt(1)La4Ni8 cuboctahedra, and faces with eight equivalent Ni(2)La4Ni6Pt2 cuboctahedra. All Pt(1)-Ni(1) bond lengths are 2.60 Å. All Pt(1)-Ni(2) bond lengths are 2.58 Å. There are two inequivalent Ni sites. In the first Ni site, Ni(1) is bonded in a 11-coordinate geometry to three equivalent La(1), two equivalent Pt(1), two equivalent Ni(1), and four equivalent Ni(2) atoms. Both Ni(1)-Ni(1) bond lengths are 2.74 Å. All Ni(1)-Ni(2) bond lengths are 2.43 Å. In the second Ni site, Ni(2) is bonded to four equivalent La(1), two equivalent Pt(1), two equivalent Ni(2), and four equivalent Ni(1) atoms to form distorted NiLa4Ni6Pt2 cuboctahedra that share corners with four equivalent Pt(1)La4Ni8 cuboctahedra, corners with twelve equivalent Ni(2)La4Ni6Pt2 cuboctahedra, edges with four equivalent Pt(1)La4Ni8 cuboctahedra, edges with six equivalent Ni(2)La4Ni6Pt2 cuboctahedra, faces with four equivalent Pt(1)La4Ni8 cuboctahedra, and faces with six equivalent Ni(2)La4Ni6Pt2 cuboctahedra. Both Ni(2)-Ni(2) bond lengths are 2.45 Å.