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MgBe2Pt crystallizes in the orthorhombic Immm space group. The structure is one-dimensional and consists of two MgBe2Pt ribbons oriented in the (1, 0, 0) direction. Mg is bonded in a linear geometry to two equivalent Be atoms. Both Mg–Be bond lengths are 2.50 Å. Be is bonded in a linear geometry to one Mg and one Pt atom. The Be–Pt bond length is 2.06 Å. Pt is bonded in a linear geometry to two equivalent Be atoms.
MgBePt2 crystallizes in the orthorhombic Immm space group. The structure is one-dimensional and consists of two MgBePt2 ribbons oriented in the (1, 0, 0) direction. Mg2+ is bonded in a linear geometry to two equivalent Pt2- atoms. Both Mg–Pt bond lengths are 2.52 Å. Be2+ is bonded in a linear geometry to two equivalent Pt2- atoms. Both Be–Pt bond lengths are 2.05 Å. Pt2- is bonded in a linear geometry to one Mg2+ and one Be2+ atom.