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YbPt2 is Cubic Laves structured and crystallizes in the cubic Fd-3m space group. The structure is three-dimensional. Yb is bonded in a 12-coordinate geometry to twelve equivalent Pt atoms. All Yb–Pt bond lengths are 3.18 Å. Pt is bonded to six equivalent Yb and six equivalent Pt atoms to form a mixture of edge, face, and corner-sharing PtYb6Pt6 cuboctahedra. All Pt–Pt bond lengths are 2.71 Å.
YPt2B crystallizes in the hexagonal P6_222 space group. The structure is three-dimensional. Y3+ is bonded to eight equivalent Pt and four equivalent B3- atoms to form a mixture of distorted edge, face, and corner-sharing YB4Pt8 cuboctahedra. There are four shorter (3.03 Å) and four longer (3.12 Å) Y–Pt bond lengths. All Y–B bond lengths are 2.99 Å. Pt is bonded in a distorted bent 120 degrees geometry to four equivalent Y3+ and two equivalent B3- atoms. Both Pt–B bond lengths are 2.10 Å. B3- is bonded in a 4-coordinate geometry to four equivalent Y3+ and four equivalent Pt atoms.