SrLa6OsI12 is trigonal omega-derived structured and crystallizes in the trigonal R-3 space group. Sr(1) is bonded to six equivalent I(1) atoms to form SrI6 octahedra that share edges with six equivalent La(1)OsI5 octahedra. La(1) is bonded to one Os(1), two equivalent I(1), and three equivalent I(2) atoms to form LaOsI5 octahedra that share corners with three equivalent La(1)OsI5 octahedra,  an edgeedge with one Sr(1)I6 octahedra, and edges with five equivalent La(1)OsI5 octahedra. The corner-sharing octahedral tilt angles range from 0-7°. Os(1) is bonded in an octahedral geometry to six equivalent La(1) atoms. There are two inequivalent I sites. In the first I site, I(1) is bonded in a distorted T-shaped geometry to one Sr(1) and two equivalent La(1) atoms. In the second I site, I(2) is bonded in a T-shaped geometry to three equivalent La(1) atoms.
SrLa6OsI12 is trigonal omega-derived structured and crystallizes in the trigonal R-3 space group. Sr(1) is bonded to six equivalent I(1) atoms to form SrI6 octahedra that share edges with six equivalent La(1)OsI5 octahedra. All Sr(1)-I(1) bond lengths are 3.29 Å. La(1) is bonded to one Os(1), two equivalent I(1), and three equivalent I(2) atoms to form LaOsI5 octahedra that share corners with three equivalent La(1)OsI5 octahedra,  an edgeedge with one Sr(1)I6 octahedra, and edges with five equivalent La(1)OsI5 octahedra. The corner-sharing octahedral tilt angles range from 0-7°. The La(1)-Os(1) bond length is 2.88 Å. There is one shorter (3.29 Å) and one longer (3.31 Å) La(1)-I(1) bond length. There are a spread of La(1)-I(2) bond distances ranging from 3.25-3.52 Å. Os(1) is bonded in an octahedral geometry to six equivalent La(1) atoms. There are two inequivalent I sites. In the first I site, I(1) is bonded in a distorted T-shaped geometry to one Sr(1) and two equivalent La(1) atoms. In the second I site, I(2) is bonded in a T-shaped geometry to three equivalent La(1) atoms.