MgPt5As crystallizes in the tetragonal P4/mmm space group. Mg(1) is bonded to four equivalent Pt(1) and eight equivalent Pt(2) atoms to form a mixture of corner and face-sharing MgPt12 cuboctahedra. There are two inequivalent Pt sites. In the first Pt site, Pt(1) is bonded in a distorted square co-planar geometry to four equivalent Mg(1) atoms. In the second Pt site, Pt(2) is bonded in a 4-coordinate geometry to two equivalent Mg(1) and two equivalent As(1) atoms. As(1) is bonded in a body-centered cubic geometry to eight equivalent Pt(2) atoms.
MgPt5As crystallizes in the tetragonal P4/mmm space group. Mg(1) is bonded to four equivalent Pt(1) and eight equivalent Pt(2) atoms to form a mixture of corner and face-sharing MgPt12 cuboctahedra. All Mg(1)-Pt(1) bond lengths are 2.79 Å. All Mg(1)-Pt(2) bond lengths are 2.80 Å. There are two inequivalent Pt sites. In the first Pt site, Pt(1) is bonded in a distorted square co-planar geometry to four equivalent Mg(1) atoms. In the second Pt site, Pt(2) is bonded in a 4-coordinate geometry to two equivalent Mg(1) and two equivalent As(1) atoms. Both Pt(2)-As(1) bond lengths are 2.53 Å. As(1) is bonded in a body-centered cubic geometry to eight equivalent Pt(2) atoms.