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K2AuHg crystallizes in the orthorhombic Immm space group. The structure is one-dimensional and consists of two K2AuHg ribbons oriented in the (0, 1, 0) direction. K is bonded in a linear geometry to one Au and one Hg atom. The K–Au bond length is 3.07 Å. The K–Hg bond length is 3.65 Å. Au is bonded in a linear geometry to two equivalent K atoms. Hg is bonded in a linear geometry to two equivalent K atoms.
K2AuHg is Heusler structured and crystallizes in the cubic Fm-3m space group. The structure is three-dimensional. K is bonded in a body-centered cubic geometry to four equivalent Au and four equivalent Hg atoms. All K–Au bond lengths are 3.57 Å. All K–Hg bond lengths are 3.57 Å. Au is bonded in a body-centered cubic geometry to eight equivalent K atoms. Hg is bonded in a body-centered cubic geometry to eight equivalent K atoms.