EuPt2As2 crystallizes in the tetragonal P4/nmm space group. Eu(1) is bonded in a 16-coordinate geometry to four equivalent Pt(1), four equivalent Pt(2), four equivalent As(1), and four equivalent As(2) atoms. There are two inequivalent Pt sites. In the first Pt site, Pt(1) is bonded in a 8-coordinate geometry to four equivalent Eu(1) and four equivalent As(2) atoms. In the second Pt site, Pt(2) is bonded in a 5-coordinate geometry to four equivalent Eu(1), one As(2), and four equivalent As(1) atoms. There are two inequivalent As sites. In the first As site, As(1) is bonded in a 8-coordinate geometry to four equivalent Eu(1) and four equivalent Pt(2) atoms. In the second As site, As(2) is bonded in a 9-coordinate geometry to four equivalent Eu(1), one Pt(2), and four equivalent Pt(1) atoms.
EuPt2As2 crystallizes in the tetragonal P4/nmm space group. Eu(1) is bonded in a 16-coordinate geometry to four equivalent Pt(1), four equivalent Pt(2), four equivalent As(1), and four equivalent As(2) atoms. All Eu(1)-Pt(1) bond lengths are 3.38 Å. All Eu(1)-Pt(2) bond lengths are 3.43 Å. All Eu(1)-As(1) bond lengths are 3.35 Å. All Eu(1)-As(2) bond lengths are 3.41 Å. There are two inequivalent Pt sites. In the first Pt site, Pt(1) is bonded in a 8-coordinate geometry to four equivalent Eu(1) and four equivalent As(2) atoms. All Pt(1)-As(2) bond lengths are 2.61 Å. In the second Pt site, Pt(2) is bonded in a 5-coordinate geometry to four equivalent Eu(1), one As(2), and four equivalent As(1) atoms. The Pt(2)-As(2) bond length is 2.49 Å. All Pt(2)-As(1) bond lengths are 2.55 Å. There are two inequivalent As sites. In the first As site, As(1) is bonded in a 8-coordinate geometry to four equivalent Eu(1) and four equivalent Pt(2) atoms. In the second As site, As(2) is bonded in a 9-coordinate geometry to four equivalent Eu(1), one Pt(2), and four equivalent Pt(1) atoms.