Sr5Sn3 crystallizes in the monoclinic C2/c space group. There are three inequivalent Sr sites. In the first Sr site, Sr(1) is bonded to two equivalent Sn(2) and three equivalent Sn(1) atoms to form a mixture of distorted face, corner, and edge-sharing SrSn5 trigonal bipyramids. In the second Sr site, Sr(1) is bonded to two equivalent Sn(2) and three equivalent Sn(1) atoms to form a mixture of distorted face, corner, and edge-sharing SrSn5 trigonal bipyramids. In the third Sr site, Sr(2) is bonded in a square co-planar geometry to four equivalent Sn(1) atoms. There are two inequivalent Sn sites. In the first Sn site, Sn(1) is bonded in a 9-coordinate geometry to two equivalent Sr(2); six Sr(1,1); and one Sn(1) atom. In the second Sn site, Sn(2) is bonded in a 8-coordinate geometry to eight Sr(1,1) atoms.
Sr5Sn3 crystallizes in the monoclinic C2/c space group. There are three inequivalent Sr sites. In the first Sr site, Sr(1) is bonded to two equivalent Sn(2) and three equivalent Sn(1) atoms to form a mixture of distorted face, corner, and edge-sharing SrSn5 trigonal bipyramids. Both Sr(1)-Sn(2) bond lengths are 3.65 Å. There is one shorter (3.37 Å) and two longer (3.49 Å) Sr(1)-Sn(1) bond lengths. In the second Sr site, Sr(1) is bonded to two equivalent Sn(2) and three equivalent Sn(1) atoms to form a mixture of distorted face, corner, and edge-sharing SrSn5 trigonal bipyramids. Both Sr(1)-Sn(2) bond lengths are 3.65 Å. There is one shorter (3.37 Å) and two longer (3.49 Å) Sr(1)-Sn(1) bond lengths. In the third Sr site, Sr(2) is bonded in a square co-planar geometry to four equivalent Sn(1) atoms. All Sr(2)-Sn(1) bond lengths are 3.43 Å. There are two inequivalent Sn sites. In the first Sn site, Sn(1) is bonded in a 9-coordinate geometry to two equivalent Sr(2); six Sr(1,1); and one Sn(1) atom. The Sn(1)-Sn(1) bond length is 2.92 Å. In the second Sn site, Sn(2) is bonded in a 8-coordinate geometry to eight Sr(1,1) atoms.