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BaMgHg2 crystallizes in the orthorhombic Immm space group. The structure is one-dimensional and consists of two BaMgHg2 ribbons oriented in the (1, 0, 0) direction. Ba is bonded in a linear geometry to two equivalent Hg atoms. Both Ba–Hg bond lengths are 3.63 Å. Mg is bonded in a linear geometry to two equivalent Hg atoms. Both Mg–Hg bond lengths are 3.06 Å. Hg is bonded in a linear geometry to one Ba and one Mg atom.
Ba2MgHg crystallizes in the orthorhombic Immm space group. The structure is one-dimensional and consists of two Ba2MgHg ribbons oriented in the (0, 1, 0) direction. Ba is bonded in a linear geometry to one Mg and one Hg atom. The Ba–Mg bond length is 3.75 Å. The Ba–Hg bond length is 3.35 Å. Mg is bonded in a linear geometry to two equivalent Ba atoms. Hg is bonded in a linear geometry to two equivalent Ba atoms.