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ScHg2In crystallizes in the orthorhombic Immm space group. The structure is one-dimensional and consists of two ScHg2In ribbons oriented in the (1, 0, 0) direction. Sc is bonded in a linear geometry to two equivalent Hg atoms. Both Sc–Hg bond lengths are 2.82 Å. Hg is bonded in a linear geometry to one Sc and one In atom. The Hg–In bond length is 2.84 Å. In is bonded in a linear geometry to two equivalent Hg atoms.
Sc2HgIn is Heusler structured and crystallizes in the cubic Fm-3m space group. The structure is three-dimensional. Sc is bonded in a body-centered cubic geometry to four equivalent Hg and four equivalent In atoms. All Sc–Hg bond lengths are 3.07 Å. All Sc–In bond lengths are 3.07 Å. Hg is bonded in a body-centered cubic geometry to eight equivalent Sc atoms. In is bonded in a body-centered cubic geometry to eight equivalent Sc atoms.