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UH3 crystallizes in the cubic Pm-3n space group. The structure is three-dimensional. U3+ is bonded to twelve equivalent H1- atoms to form a mixture of edge and face-sharing UH12 cuboctahedra. All U–H bond lengths are 2.31 Å. H1- is bonded to four equivalent U3+ atoms to form a mixture of distorted corner and edge-sharing HU4 tetrahedra.
UH3 crystallizes in the cubic Pm-3n space group. The structure is three-dimensional. there are two inequivalent U3+ sites. In the first U3+ site, U3+ is bonded to twelve equivalent H1- atoms to form face-sharing UH12 cuboctahedra. All U–H bond lengths are 2.26 Å. In the second U3+ site, U3+ is bonded to twelve equivalent H1- atoms to form a mixture of edge and face-sharing UH12 cuboctahedra. There are four shorter (2.30 Å) and eight longer (2.33 Å) U–H bond lengths. H1- is bonded to four U3+ atoms to form a mixture of edge, corner, and face-sharing HU4 tetrahedra.