K2PtAs2 crystallizes in the orthorhombic Cmcm space group. There are two inequivalent K sites. In the first K site, K(1) is bonded in a 6-coordinate geometry to six equivalent As(1) atoms. In the second K site, K(2) is bonded in a 8-coordinate geometry to two equivalent Pt(1) and six equivalent As(1) atoms. Pt(1) is bonded in a 6-coordinate geometry to two equivalent K(2) and four equivalent As(1) atoms. As(1) is bonded in a 9-coordinate geometry to three equivalent K(1), three equivalent K(2), two equivalent Pt(1), and one As(1) atom.
K2PtAs2 crystallizes in the orthorhombic Cmcm space group. There are two inequivalent K sites. In the first K site, K(1) is bonded in a 6-coordinate geometry to six equivalent As(1) atoms. There are two shorter (3.39 Å) and four longer (3.69 Å) K(1)-As(1) bond lengths. In the second K site, K(2) is bonded in a 8-coordinate geometry to two equivalent Pt(1) and six equivalent As(1) atoms. Both K(2)-Pt(1) bond lengths are 3.28 Å. There are two shorter (3.34 Å) and four longer (3.55 Å) K(2)-As(1) bond lengths. Pt(1) is bonded in a 6-coordinate geometry to two equivalent K(2) and four equivalent As(1) atoms. All Pt(1)-As(1) bond lengths are 2.51 Å. As(1) is bonded in a 9-coordinate geometry to three equivalent K(1), three equivalent K(2), two equivalent Pt(1), and one As(1) atom. The As(1)-As(1) bond length is 2.43 Å.