LaOs4P12 crystallizes in the cubic Im-3 space group. La(1) is bonded to twelve equivalent P(1) atoms to form LaP12 cuboctahedra that share faces with eight equivalent Os(1)P6 octahedra. Os(1) is bonded to six equivalent P(1) atoms to form distorted OsP6 octahedra that share corners with six equivalent Os(1)P6 octahedra and faces with two equivalent La(1)P12 cuboctahedra. The corner-sharing octahedral tilt angles are 62°. P(1) is bonded in a 5-coordinate geometry to one La(1), two equivalent Os(1), and two equivalent P(1) atoms.
LaOs4P12 crystallizes in the cubic Im-3 space group. La(1) is bonded to twelve equivalent P(1) atoms to form LaP12 cuboctahedra that share faces with eight equivalent Os(1)P6 octahedra. All La(1)-P(1) bond lengths are 3.12 Å. Os(1) is bonded to six equivalent P(1) atoms to form distorted OsP6 octahedra that share corners with six equivalent Os(1)P6 octahedra and faces with two equivalent La(1)P12 cuboctahedra. The corner-sharing octahedral tilt angles are 62°. All Os(1)-P(1) bond lengths are 2.37 Å. P(1) is bonded in a 5-coordinate geometry to one La(1), two equivalent Os(1), and two equivalent P(1) atoms. There is one shorter (2.31 Å) and one longer (2.33 Å) P(1)-P(1) bond length.