Sr3Sb3N5 is Chalcostibite-like structured and crystallizes in the triclinic P-1 space group. There are three inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 3-coordinate geometry to one N(4) and two equivalent N(2) atoms. In the second Sr site, Sr(2) is bonded in a 5-coordinate geometry to one N(1), one N(3), one N(4), and two equivalent N(5) atoms. In the third Sr site, Sr(3) is bonded in a 4-coordinate geometry to one N(1), one N(2), one N(3), and one N(4) atom. There are three inequivalent Sb sites. In the first Sb site, Sb(1) is bonded in a distorted trigonal non-coplanar geometry to one N(5) and two equivalent N(3) atoms. In the second Sb site, Sb(2) is bonded in a distorted trigonal non-coplanar geometry to one N(1), one N(2), and one N(4) atom. In the third Sb site, Sb(3) is bonded in a 3-coordinate geometry to one N(1), one N(4), and one N(5) atom. There are five inequivalent N sites. In the first N site, N(1) is bonded to one Sr(2), one Sr(3), one Sb(2), and one Sb(3) atom to form distorted NSr2Sb2 tetrahedra that share corners with two equivalent N(3)Sr2Sb2 tetrahedra, corners with three equivalent N(5)Sr2Sb2 tetrahedra, corners with two equivalent N(2)Sr3Sb trigonal pyramids, and edges with two equivalent N(4)Sr3Sb2 trigonal bipyramids. In the second N site, N(2) is bonded to one Sr(3), two equivalent Sr(1), and one Sb(2) atom to form NSr3Sb trigonal pyramids that share  a cornercorner with one N(3)Sr2Sb2 tetrahedra, corners with two equivalent N(1)Sr2Sb2 tetrahedra, corners with two equivalent N(4)Sr3Sb2 trigonal bipyramids,  an edgeedge with one N(4)Sr3Sb2 trigonal bipyramid, and  an edgeedge with one N(2)Sr3Sb trigonal pyramid. In the third N site, N(3) is bonded to one Sr(2), one Sr(3), and two equivalent Sb(1) atoms to form distorted NSr2Sb2 tetrahedra that share corners with two equivalent N(1)Sr2Sb2 tetrahedra, corners with four equivalent N(5)Sr2Sb2 tetrahedra, corners with two equivalent N(4)Sr3Sb2 trigonal bipyramids,  a cornercorner with one N(2)Sr3Sb trigonal pyramid, and  an edgeedge with one N(3)Sr2Sb2 tetrahedra. In the fourth N site, N(4) is bonded to one Sr(1), one Sr(2), one Sr(3), one Sb(2), and one Sb(3) atom to form distorted NSr3Sb2 trigonal bipyramids that share  a cornercorner with one N(5)Sr2Sb2 tetrahedra, corners with two equivalent N(3)Sr2Sb2 tetrahedra, corners with two equivalent N(2)Sr3Sb trigonal pyramids,  an edgeedge with one N(5)Sr2Sb2 tetrahedra, edges with two equivalent N(1)Sr2Sb2 tetrahedra, and  an edgeedge with one N(2)Sr3Sb trigonal pyramid. In the fifth N site, N(5) is bonded to two equivalent Sr(2), one Sb(1), and one Sb(3) atom to form NSr2Sb2 tetrahedra that share corners with three equivalent N(1)Sr2Sb2 tetrahedra, corners with four equivalent N(3)Sr2Sb2 tetrahedra,  a cornercorner with one N(4)Sr3Sb2 trigonal bipyramid,  an edgeedge with one N(5)Sr2Sb2 tetrahedra, and  an edgeedge with one N(4)Sr3Sb2 trigonal bipyramid.
Sr3Sb3N5 is Chalcostibite-like structured and crystallizes in the triclinic P-1 space group. There are three inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 3-coordinate geometry to one N(4) and two equivalent N(2) atoms. The Sr(1)-N(4) bond length is 2.81 Å. There is one shorter (2.50 Å) and one longer (2.60 Å) Sr(1)-N(2) bond length. In the second Sr site, Sr(2) is bonded in a 5-coordinate geometry to one N(1), one N(3), one N(4), and two equivalent N(5) atoms. The Sr(2)-N(1) bond length is 2.55 Å. The Sr(2)-N(3) bond length is 2.59 Å. The Sr(2)-N(4) bond length is 2.82 Å. There is one shorter (2.55 Å) and one longer (2.58 Å) Sr(2)-N(5) bond length. In the third Sr site, Sr(3) is bonded in a 4-coordinate geometry to one N(1), one N(2), one N(3), and one N(4) atom. The Sr(3)-N(1) bond length is 2.62 Å. The Sr(3)-N(2) bond length is 2.62 Å. The Sr(3)-N(3) bond length is 2.65 Å. The Sr(3)-N(4) bond length is 2.65 Å. There are three inequivalent Sb sites. In the first Sb site, Sb(1) is bonded in a distorted trigonal non-coplanar geometry to one N(5) and two equivalent N(3) atoms. The Sb(1)-N(5) bond length is 2.06 Å. There is one shorter (2.08 Å) and one longer (2.10 Å) Sb(1)-N(3) bond length. In the second Sb site, Sb(2) is bonded in a distorted trigonal non-coplanar geometry to one N(1), one N(2), and one N(4) atom. The Sb(2)-N(1) bond length is 2.08 Å. The Sb(2)-N(2) bond length is 2.04 Å. The Sb(2)-N(4) bond length is 2.11 Å. In the third Sb site, Sb(3) is bonded in a 3-coordinate geometry to one N(1), one N(4), and one N(5) atom. The Sb(3)-N(1) bond length is 2.06 Å. The Sb(3)-N(4) bond length is 2.09 Å. The Sb(3)-N(5) bond length is 2.06 Å. There are five inequivalent N sites. In the first N site, N(1) is bonded to one Sr(2), one Sr(3), one Sb(2), and one Sb(3) atom to form distorted NSr2Sb2 tetrahedra that share corners with two equivalent N(3)Sr2Sb2 tetrahedra, corners with three equivalent N(5)Sr2Sb2 tetrahedra, corners with two equivalent N(2)Sr3Sb trigonal pyramids, and edges with two equivalent N(4)Sr3Sb2 trigonal bipyramids. In the second N site, N(2) is bonded to one Sr(3), two equivalent Sr(1), and one Sb(2) atom to form NSr3Sb trigonal pyramids that share  a cornercorner with one N(3)Sr2Sb2 tetrahedra, corners with two equivalent N(1)Sr2Sb2 tetrahedra, corners with two equivalent N(4)Sr3Sb2 trigonal bipyramids,  an edgeedge with one N(4)Sr3Sb2 trigonal bipyramid, and  an edgeedge with one N(2)Sr3Sb trigonal pyramid. In the third N site, N(3) is bonded to one Sr(2), one Sr(3), and two equivalent Sb(1) atoms to form distorted NSr2Sb2 tetrahedra that share corners with two equivalent N(1)Sr2Sb2 tetrahedra, corners with four equivalent N(5)Sr2Sb2 tetrahedra, corners with two equivalent N(4)Sr3Sb2 trigonal bipyramids,  a cornercorner with one N(2)Sr3Sb trigonal pyramid, and  an edgeedge with one N(3)Sr2Sb2 tetrahedra. In the fourth N site, N(4) is bonded to one Sr(1), one Sr(2), one Sr(3), one Sb(2), and one Sb(3) atom to form distorted NSr3Sb2 trigonal bipyramids that share  a cornercorner with one N(5)Sr2Sb2 tetrahedra, corners with two equivalent N(3)Sr2Sb2 tetrahedra, corners with two equivalent N(2)Sr3Sb trigonal pyramids,  an edgeedge with one N(5)Sr2Sb2 tetrahedra, edges with two equivalent N(1)Sr2Sb2 tetrahedra, and  an edgeedge with one N(2)Sr3Sb trigonal pyramid. In the fifth N site, N(5) is bonded to two equivalent Sr(2), one Sb(1), and one Sb(3) atom to form NSr2Sb2 tetrahedra that share corners with three equivalent N(1)Sr2Sb2 tetrahedra, corners with four equivalent N(3)Sr2Sb2 tetrahedra,  a cornercorner with one N(4)Sr3Sb2 trigonal bipyramid,  an edgeedge with one N(5)Sr2Sb2 tetrahedra, and  an edgeedge with one N(4)Sr3Sb2 trigonal bipyramid.