BaPtAs2 crystallizes in the orthorhombic Cmcm space group. Ba(1) is bonded in a 15-coordinate geometry to five equivalent Pt(1), four equivalent As(2), and six equivalent As(1) atoms. Pt(1) is bonded in a 5-coordinate geometry to five equivalent Ba(1), one As(1), and four equivalent As(2) atoms. There are two inequivalent As sites. In the first As site, As(1) is bonded in a 9-coordinate geometry to six equivalent Ba(1), one Pt(1), and two equivalent As(1) atoms. In the second As site, As(2) is bonded in a 8-coordinate geometry to four equivalent Ba(1) and four equivalent Pt(1) atoms.
BaPtAs2 crystallizes in the orthorhombic Cmcm space group. Ba(1) is bonded in a 15-coordinate geometry to five equivalent Pt(1), four equivalent As(2), and six equivalent As(1) atoms. There is one shorter (3.55 Å) and four longer (3.62 Å) Ba(1)-Pt(1) bond lengths. There are two shorter (3.42 Å) and two longer (3.44 Å) Ba(1)-As(2) bond lengths. There are two shorter (3.44 Å) and four longer (3.50 Å) Ba(1)-As(1) bond lengths. Pt(1) is bonded in a 5-coordinate geometry to five equivalent Ba(1), one As(1), and four equivalent As(2) atoms. The Pt(1)-As(1) bond length is 2.58 Å. There are two shorter (2.54 Å) and two longer (2.59 Å) Pt(1)-As(2) bond lengths. There are two inequivalent As sites. In the first As site, As(1) is bonded in a 9-coordinate geometry to six equivalent Ba(1), one Pt(1), and two equivalent As(1) atoms. Both As(1)-As(1) bond lengths are 2.70 Å. In the second As site, As(2) is bonded in a 8-coordinate geometry to four equivalent Ba(1) and four equivalent Pt(1) atoms.