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UBr3 crystallizes in the hexagonal P6_3/m space group. The structure is three-dimensional. U3+ is bonded in a 9-coordinate geometry to nine equivalent Br1- atoms. There are six shorter (3.07 Å) and three longer (3.17 Å) U–Br bond lengths. Br1- is bonded in a distorted trigonal non-coplanar geometry to three equivalent U3+ atoms.
UBr4 crystallizes in the monoclinic C2/m space group. The structure is two-dimensional and consists of one UBr4 sheet oriented in the (0, 0, 1) direction. U4+ is bonded to seven Br1- atoms to form edge-sharing UBr7 pentagonal bipyramids. There are a spread of U–Br bond distances ranging from 2.66–3.03 Å. There are three inequivalent Br1- sites. In the first Br1- site, Br1- is bonded in a single-bond geometry to one U4+ atom. In the second Br1- site, Br1- is bonded in a water-like geometry to two equivalent U4+ atoms. In the third Br1- site, Br1- is bonded in a water-like geometry to two equivalent U4+ atoms.
BrU is alpha-derived structured and crystallizes in the hexagonal P-6m2 space group. The structure is three-dimensional. U is bonded in a 12-coordinate geometry to six equivalent Br atoms. All U–Br bond lengths are 3.07 Å. Br is bonded in a 6-coordinate geometry to six equivalent U atoms.