Sr11InSb9 crystallizes in the orthorhombic Iba2 space group. There are six inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 7-coordinate geometry to one In(1), two equivalent Sb(1), two equivalent Sb(3), and two equivalent Sb(4) atoms. In the second Sr site, Sr(2) is bonded in a 8-coordinate geometry to one In(1), one Sb(1), one Sb(4), two equivalent Sb(2), and three equivalent Sb(3) atoms. In the third Sr site, Sr(3) is bonded in a 6-coordinate geometry to one Sb(1), one Sb(2), one Sb(3), one Sb(5), and two equivalent Sb(4) atoms. In the fourth Sr site, Sr(4) is bonded in a 5-coordinate geometry to one Sb(3), one Sb(4), one Sb(5), and two equivalent Sb(2) atoms. In the fifth Sr site, Sr(5) is bonded in a 6-coordinate geometry to one Sb(3), one Sb(5), two equivalent Sb(1), and two equivalent Sb(2) atoms. In the sixth Sr site, Sr(6) is bonded to one Sb(2), one Sb(3), one Sb(4), one Sb(5), and two equivalent Sb(1) atoms to form distorted corner-sharing SrSb6 octahedra. The corner-sharing octahedral tilt angles range from 36-56°. In(1) is bonded in a 4-coordinate geometry to one Sr(1), two equivalent Sr(2), two equivalent Sb(3), and two equivalent Sb(4) atoms. There are five inequivalent Sb sites. In the first Sb site, Sb(1) is bonded in a 7-coordinate geometry to one Sr(1), one Sr(2), one Sr(3), two equivalent Sr(5), and two equivalent Sr(6) atoms. In the second Sb site, Sb(2) is bonded in a 9-coordinate geometry to one Sr(3), one Sr(6), two equivalent Sr(2), two equivalent Sr(4), two equivalent Sr(5), and one Sb(2) atom. In the third Sb site, Sb(3) is bonded in a 9-coordinate geometry to one Sr(1), one Sr(3), one Sr(4), one Sr(5), one Sr(6), three equivalent Sr(2), and one In(1) atom. In the fourth Sb site, Sb(4) is bonded in a 7-coordinate geometry to one Sr(1), one Sr(2), one Sr(4), one Sr(6), two equivalent Sr(3), and one In(1) atom. In the fifth Sb site, Sb(5) is bonded in a 8-coordinate geometry to two equivalent Sr(3), two equivalent Sr(4), two equivalent Sr(5), and two equivalent Sr(6) atoms.
Sr11InSb9 crystallizes in the orthorhombic Iba2 space group. There are six inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 7-coordinate geometry to one In(1), two equivalent Sb(1), two equivalent Sb(3), and two equivalent Sb(4) atoms. The Sr(1)-In(1) bond length is 3.78 Å. Both Sr(1)-Sb(1) bond lengths are 3.23 Å. Both Sr(1)-Sb(3) bond lengths are 3.85 Å. Both Sr(1)-Sb(4) bond lengths are 3.47 Å. In the second Sr site, Sr(2) is bonded in a 8-coordinate geometry to one In(1), one Sb(1), one Sb(4), two equivalent Sb(2), and three equivalent Sb(3) atoms. The Sr(2)-In(1) bond length is 3.57 Å. The Sr(2)-Sb(1) bond length is 3.23 Å. The Sr(2)-Sb(4) bond length is 3.37 Å. There is one shorter (3.81 Å) and one longer (3.96 Å) Sr(2)-Sb(2) bond length. There is one shorter (3.68 Å) and two longer (3.85 Å) Sr(2)-Sb(3) bond lengths. In the third Sr site, Sr(3) is bonded in a 6-coordinate geometry to one Sb(1), one Sb(2), one Sb(3), one Sb(5), and two equivalent Sb(4) atoms. The Sr(3)-Sb(1) bond length is 3.26 Å. The Sr(3)-Sb(2) bond length is 3.27 Å. The Sr(3)-Sb(3) bond length is 3.55 Å. The Sr(3)-Sb(5) bond length is 3.60 Å. There is one shorter (3.49 Å) and one longer (3.55 Å) Sr(3)-Sb(4) bond length. In the fourth Sr site, Sr(4) is bonded in a 5-coordinate geometry to one Sb(3), one Sb(4), one Sb(5), and two equivalent Sb(2) atoms. The Sr(4)-Sb(3) bond length is 3.39 Å. The Sr(4)-Sb(4) bond length is 3.50 Å. The Sr(4)-Sb(5) bond length is 3.22 Å. There is one shorter (3.59 Å) and one longer (3.63 Å) Sr(4)-Sb(2) bond length. In the fifth Sr site, Sr(5) is bonded in a 6-coordinate geometry to one Sb(3), one Sb(5), two equivalent Sb(1), and two equivalent Sb(2) atoms. The Sr(5)-Sb(3) bond length is 3.33 Å. The Sr(5)-Sb(5) bond length is 3.23 Å. Both Sr(5)-Sb(1) bond lengths are 3.67 Å. There is one shorter (3.63 Å) and one longer (3.64 Å) Sr(5)-Sb(2) bond length. In the sixth Sr site, Sr(6) is bonded to one Sb(2), one Sb(3), one Sb(4), one Sb(5), and two equivalent Sb(1) atoms to form distorted corner-sharing SrSb6 octahedra. The corner-sharing octahedral tilt angles range from 36-56°. The Sr(6)-Sb(2) bond length is 3.28 Å. The Sr(6)-Sb(3) bond length is 3.54 Å. The Sr(6)-Sb(4) bond length is 3.41 Å. The Sr(6)-Sb(5) bond length is 3.50 Å. There is one shorter (3.21 Å) and one longer (3.42 Å) Sr(6)-Sb(1) bond length. In(1) is bonded in a 4-coordinate geometry to one Sr(1), two equivalent Sr(2), two equivalent Sb(3), and two equivalent Sb(4) atoms. Both In(1)-Sb(3) bond lengths are 2.94 Å. Both In(1)-Sb(4) bond lengths are 2.96 Å. There are five inequivalent Sb sites. In the first Sb site, Sb(1) is bonded in a 7-coordinate geometry to one Sr(1), one Sr(2), one Sr(3), two equivalent Sr(5), and two equivalent Sr(6) atoms. In the second Sb site, Sb(2) is bonded in a 9-coordinate geometry to one Sr(3), one Sr(6), two equivalent Sr(2), two equivalent Sr(4), two equivalent Sr(5), and one Sb(2) atom. The Sb(2)-Sb(2) bond length is 2.87 Å. In the third Sb site, Sb(3) is bonded in a 9-coordinate geometry to one Sr(1), one Sr(3), one Sr(4), one Sr(5), one Sr(6), three equivalent Sr(2), and one In(1) atom. In the fourth Sb site, Sb(4) is bonded in a 7-coordinate geometry to one Sr(1), one Sr(2), one Sr(4), one Sr(6), two equivalent Sr(3), and one In(1) atom. In the fifth Sb site, Sb(5) is bonded in a 8-coordinate geometry to two equivalent Sr(3), two equivalent Sr(4), two equivalent Sr(5), and two equivalent Sr(6) atoms.