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K2Pt is Fluorite structured and crystallizes in the cubic Fm-3m space group. The structure is three-dimensional. K1+ is bonded to four equivalent Pt2- atoms to form a mixture of corner and edge-sharing KPt4 tetrahedra. All K–Pt bond lengths are 3.32 Å. Pt2- is bonded in a body-centered cubic geometry to eight equivalent K1+ atoms.
KPt3 crystallizes in the hexagonal P6_3/mmc space group. The structure is three-dimensional. K is bonded to twelve equivalent Pt atoms to form a mixture of distorted face and corner-sharing KPt12 cuboctahedra. There are six shorter (3.18 Å) and six longer (3.28 Å) K–Pt bond lengths. Pt is bonded in a 4-coordinate geometry to four equivalent K and six equivalent Pt atoms. There are two shorter (2.72 Å) and four longer (2.78 Å) Pt–Pt bond lengths.