PaSe3 crystallizes in the hexagonal P6_3/mmc space group. Pa(1) is bonded to twelve equivalent Se(1) atoms to form a mixture of corner and face-sharing PaSe12 cuboctahedra. Se(1) is bonded in a distorted see-saw-like geometry to four equivalent Pa(1) and two equivalent Se(1) atoms.
PaSe3 crystallizes in the hexagonal P6_3/mmc space group. Pa(1) is bonded to twelve equivalent Se(1) atoms to form a mixture of corner and face-sharing PaSe12 cuboctahedra. All Pa(1)-Se(1) bond lengths are 3.09 Å. Se(1) is bonded in a distorted see-saw-like geometry to four equivalent Pa(1) and two equivalent Se(1) atoms. Both Se(1)-Se(1) bond lengths are 2.90 Å.