Sr(MgSb)2 crystallizes in the trigonal P-3m1 space group. Sr(1) is bonded to six equivalent Sb(1) atoms to form SrSb6 octahedra that share corners with twelve equivalent Mg(1)Sb4 tetrahedra, edges with six equivalent Sr(1)Sb6 octahedra, and edges with six equivalent Mg(1)Sb4 tetrahedra. Mg(1) is bonded to four equivalent Sb(1) atoms to form MgSb4 tetrahedra that share corners with six equivalent Sr(1)Sb6 octahedra, corners with six equivalent Mg(1)Sb4 tetrahedra, edges with three equivalent Sr(1)Sb6 octahedra, and edges with three equivalent Mg(1)Sb4 tetrahedra. The corner-sharing octahedral tilt angles range from 18-53°. Sb(1) is bonded to three equivalent Sr(1) and four equivalent Mg(1) atoms to form a mixture of distorted corner and edge-sharing SbSr3Mg4 pentagonal bipyramids.
Sr(MgSb)2 crystallizes in the trigonal P-3m1 space group. Sr(1) is bonded to six equivalent Sb(1) atoms to form SrSb6 octahedra that share corners with twelve equivalent Mg(1)Sb4 tetrahedra, edges with six equivalent Sr(1)Sb6 octahedra, and edges with six equivalent Mg(1)Sb4 tetrahedra. All Sr(1)-Sb(1) bond lengths are 3.40 Å. Mg(1) is bonded to four equivalent Sb(1) atoms to form MgSb4 tetrahedra that share corners with six equivalent Sr(1)Sb6 octahedra, corners with six equivalent Mg(1)Sb4 tetrahedra, edges with three equivalent Sr(1)Sb6 octahedra, and edges with three equivalent Mg(1)Sb4 tetrahedra. The corner-sharing octahedral tilt angles range from 18-53°. There are three shorter (2.87 Å) and one longer (2.91 Å) Mg(1)-Sb(1) bond length. Sb(1) is bonded to three equivalent Sr(1) and four equivalent Mg(1) atoms to form a mixture of distorted corner and edge-sharing SbSr3Mg4 pentagonal bipyramids.