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ThMn3Ni2 crystallizes in the hexagonal P6/mmm space group. The structure is three-dimensional. Th is bonded in a distorted hexagonal planar geometry to six equivalent Ni atoms. All Th–Ni bond lengths are 2.90 Å. Mn is bonded in a 12-coordinate geometry to four equivalent Ni atoms. All Mn–Ni bond lengths are 2.53 Å. Ni is bonded in a 12-coordinate geometry to three equivalent Th and six equivalent Mn atoms.
ThMn2Ni3 crystallizes in the hexagonal P6/mmm space group. The structure is three-dimensional. Th is bonded in a 6-coordinate geometry to six equivalent Mn and twelve equivalent Ni atoms. All Th–Mn bond lengths are 2.93 Å. All Th–Ni bond lengths are 3.22 Å. Mn is bonded in a 12-coordinate geometry to three equivalent Th and six equivalent Ni atoms. All Mn–Ni bond lengths are 2.47 Å. Ni is bonded to four equivalent Th and four equivalent Mn atoms to form a mixture of distorted edge, corner, and face-sharing NiTh4Mn4 cuboctahedra.