Ammonium hexabromomercurate(II) is a chemical compound with the chemical formula .
Synthesis Heating of a mixture of mercury(II) bromide and ammonium bromide:
Physical properties The compound forms black crystals of tetragonal system, space group P4/mnc, cell parameters: a = 0.925560 nm, c = 0.88657 nm, Z = 2.
At a temperature of 200 K, the compound enters a phase of the monoclinic system, space group P21/n. At 250 K, it forms crystals of the orthorhombic system, space group Pnnm.
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