Sr5Mo2N7 crystallizes in the triclinic P-1 space group. There are five inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 6-coordinate geometry to one N(1), one N(2), one N(3), one N(4), one N(6), and one N(7) atom. In the second Sr site, Sr(2) is bonded to one N(2), two equivalent N(3), and two equivalent N(4) atoms to form distorted SrN5 square pyramids that share  a cornercorner with one Mo(1)N4 tetrahedra, corners with two equivalent Mo(2)N4 tetrahedra, edges with two equivalent Sr(2)N5 square pyramids, and  an edgeedge with one Mo(1)N4 tetrahedra. In the third Sr site, Sr(3) is bonded in a 6-coordinate geometry to one N(1), one N(4), two equivalent N(6), and two equivalent N(7) atoms. In the fourth Sr site, Sr(4) is bonded to one N(1), one N(6), one N(7), and two equivalent N(5) atoms to form distorted SrN5 trigonal bipyramids that share corners with two equivalent Mo(1)N4 tetrahedra, corners with two equivalent Mo(2)N4 tetrahedra,  an edgeedge with one Mo(2)N4 tetrahedra, and  an edgeedge with one Sr(4)N5 trigonal bipyramid. In the fifth Sr site, Sr(5) is bonded in a 6-coordinate geometry to one N(2), one N(3), one N(4), one N(7), and two equivalent N(5) atoms. There are two inequivalent Mo sites. In the first Mo site, Mo(1) is bonded to one N(2), one N(3), and two equivalent N(1) atoms to form MoN4 tetrahedra that share  a cornercorner with one Sr(2)N5 square pyramid, corners with two equivalent Sr(4)N5 trigonal bipyramids,  an edgeedge with one Sr(2)N5 square pyramid, and  an edgeedge with one Mo(1)N4 tetrahedra. In the second Mo site, Mo(2) is bonded to one N(4), one N(5), one N(6), and one N(7) atom to form MoN4 tetrahedra that share corners with two equivalent Sr(2)N5 square pyramids, corners with two equivalent Sr(4)N5 trigonal bipyramids, and  an edgeedge with one Sr(4)N5 trigonal bipyramid. There are seven inequivalent N sites. In the first N site, N(1) is bonded to one Sr(1), one Sr(3), one Sr(4), and two equivalent Mo(1) atoms to form distorted NSr3Mo2 square pyramids that share  a cornercorner with one N(3)Sr4Mo square pyramid, corners with two equivalent N(5)Sr4Mo trigonal bipyramids,  an edgeedge with one N(1)Sr3Mo2 square pyramid,  an edgeedge with one N(3)Sr4Mo square pyramid, and edges with two equivalent N(6)Sr4Mo square pyramids. In the second N site, N(2) is bonded in a 4-coordinate geometry to one Sr(1), one Sr(2), one Sr(5), and one Mo(1) atom. In the third N site, N(3) is bonded to one Sr(1), one Sr(5), two equivalent Sr(2), and one Mo(1) atom to form distorted NSr4Mo square pyramids that share  a cornercorner with one N(1)Sr3Mo2 square pyramid,  a cornercorner with one N(6)Sr4Mo square pyramid, corners with two equivalent N(5)Sr4Mo trigonal bipyramids,  an edgeedge with one N(1)Sr3Mo2 square pyramid, and  an edgeedge with one N(3)Sr4Mo square pyramid. In the fourth N site, N(4) is bonded in a 6-coordinate geometry to one Sr(1), one Sr(3), one Sr(5), two equivalent Sr(2), and one Mo(2) atom. In the fifth N site, N(5) is bonded to two equivalent Sr(4), two equivalent Sr(5), and one Mo(2) atom to form distorted NSr4Mo trigonal bipyramids that share  a cornercorner with one N(6)Sr4Mo square pyramid, corners with two equivalent N(1)Sr3Mo2 square pyramids, corners with two equivalent N(3)Sr4Mo square pyramids,  an edgeedge with one N(6)Sr4Mo square pyramid, and edges with two equivalent N(5)Sr4Mo trigonal bipyramids. In the sixth N site, N(6) is bonded to one Sr(1), one Sr(4), two equivalent Sr(3), and one Mo(2) atom to form distorted NSr4Mo square pyramids that share  a cornercorner with one N(3)Sr4Mo square pyramid,  a cornercorner with one N(5)Sr4Mo trigonal bipyramid,  an edgeedge with one N(6)Sr4Mo square pyramid, edges with two equivalent N(1)Sr3Mo2 square pyramids, and  an edgeedge with one N(5)Sr4Mo trigonal bipyramid. In the seventh N site, N(7) is bonded in a 6-coordinate geometry to one Sr(1), one Sr(4), one Sr(5), two equivalent Sr(3), and one Mo(2) atom.
Sr5Mo2N7 crystallizes in the triclinic P-1 space group. There are five inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 6-coordinate geometry to one N(1), one N(2), one N(3), one N(4), one N(6), and one N(7) atom. The Sr(1)-N(1) bond length is 2.79 Å. The Sr(1)-N(2) bond length is 2.58 Å. The Sr(1)-N(3) bond length is 2.83 Å. The Sr(1)-N(4) bond length is 3.05 Å. The Sr(1)-N(6) bond length is 2.70 Å. The Sr(1)-N(7) bond length is 2.64 Å. In the second Sr site, Sr(2) is bonded to one N(2), two equivalent N(3), and two equivalent N(4) atoms to form distorted SrN5 square pyramids that share  a cornercorner with one Mo(1)N4 tetrahedra, corners with two equivalent Mo(2)N4 tetrahedra, edges with two equivalent Sr(2)N5 square pyramids, and  an edgeedge with one Mo(1)N4 tetrahedra. The Sr(2)-N(2) bond length is 2.73 Å. There is one shorter (2.63 Å) and one longer (2.64 Å) Sr(2)-N(3) bond length. There is one shorter (2.57 Å) and one longer (2.64 Å) Sr(2)-N(4) bond length. In the third Sr site, Sr(3) is bonded in a 6-coordinate geometry to one N(1), one N(4), two equivalent N(6), and two equivalent N(7) atoms. The Sr(3)-N(1) bond length is 2.61 Å. The Sr(3)-N(4) bond length is 2.90 Å. There is one shorter (2.58 Å) and one longer (2.60 Å) Sr(3)-N(6) bond length. There is one shorter (2.83 Å) and one longer (2.88 Å) Sr(3)-N(7) bond length. In the fourth Sr site, Sr(4) is bonded to one N(1), one N(6), one N(7), and two equivalent N(5) atoms to form distorted SrN5 trigonal bipyramids that share corners with two equivalent Mo(1)N4 tetrahedra, corners with two equivalent Mo(2)N4 tetrahedra,  an edgeedge with one Mo(2)N4 tetrahedra, and  an edgeedge with one Sr(4)N5 trigonal bipyramid. The Sr(4)-N(1) bond length is 2.64 Å. The Sr(4)-N(6) bond length is 2.71 Å. The Sr(4)-N(7) bond length is 2.73 Å. There is one shorter (2.55 Å) and one longer (2.65 Å) Sr(4)-N(5) bond length. In the fifth Sr site, Sr(5) is bonded in a 6-coordinate geometry to one N(2), one N(3), one N(4), one N(7), and two equivalent N(5) atoms. The Sr(5)-N(2) bond length is 2.61 Å. The Sr(5)-N(3) bond length is 2.64 Å. The Sr(5)-N(4) bond length is 2.93 Å. The Sr(5)-N(7) bond length is 2.85 Å. There is one shorter (2.60 Å) and one longer (2.80 Å) Sr(5)-N(5) bond length. There are two inequivalent Mo sites. In the first Mo site, Mo(1) is bonded to one N(2), one N(3), and two equivalent N(1) atoms to form MoN4 tetrahedra that share  a cornercorner with one Sr(2)N5 square pyramid, corners with two equivalent Sr(4)N5 trigonal bipyramids,  an edgeedge with one Sr(2)N5 square pyramid, and  an edgeedge with one Mo(1)N4 tetrahedra. The Mo(1)-N(2) bond length is 1.82 Å. The Mo(1)-N(3) bond length is 1.84 Å. There is one shorter (2.00 Å) and one longer (2.03 Å) Mo(1)-N(1) bond length. In the second Mo site, Mo(2) is bonded to one N(4), one N(5), one N(6), and one N(7) atom to form MoN4 tetrahedra that share corners with two equivalent Sr(2)N5 square pyramids, corners with two equivalent Sr(4)N5 trigonal bipyramids, and  an edgeedge with one Sr(4)N5 trigonal bipyramid. The Mo(2)-N(4) bond length is 1.87 Å. The Mo(2)-N(5) bond length is 1.86 Å. The Mo(2)-N(6) bond length is 1.87 Å. The Mo(2)-N(7) bond length is 1.88 Å. There are seven inequivalent N sites. In the first N site, N(1) is bonded to one Sr(1), one Sr(3), one Sr(4), and two equivalent Mo(1) atoms to form distorted NSr3Mo2 square pyramids that share  a cornercorner with one N(3)Sr4Mo square pyramid, corners with two equivalent N(5)Sr4Mo trigonal bipyramids,  an edgeedge with one N(1)Sr3Mo2 square pyramid,  an edgeedge with one N(3)Sr4Mo square pyramid, and edges with two equivalent N(6)Sr4Mo square pyramids. In the second N site, N(2) is bonded in a 4-coordinate geometry to one Sr(1), one Sr(2), one Sr(5), and one Mo(1) atom. In the third N site, N(3) is bonded to one Sr(1), one Sr(5), two equivalent Sr(2), and one Mo(1) atom to form distorted NSr4Mo square pyramids that share  a cornercorner with one N(1)Sr3Mo2 square pyramid,  a cornercorner with one N(6)Sr4Mo square pyramid, corners with two equivalent N(5)Sr4Mo trigonal bipyramids,  an edgeedge with one N(1)Sr3Mo2 square pyramid, and  an edgeedge with one N(3)Sr4Mo square pyramid. In the fourth N site, N(4) is bonded in a 6-coordinate geometry to one Sr(1), one Sr(3), one Sr(5), two equivalent Sr(2), and one Mo(2) atom. In the fifth N site, N(5) is bonded to two equivalent Sr(4), two equivalent Sr(5), and one Mo(2) atom to form distorted NSr4Mo trigonal bipyramids that share  a cornercorner with one N(6)Sr4Mo square pyramid, corners with two equivalent N(1)Sr3Mo2 square pyramids, corners with two equivalent N(3)Sr4Mo square pyramids,  an edgeedge with one N(6)Sr4Mo square pyramid, and edges with two equivalent N(5)Sr4Mo trigonal bipyramids. In the sixth N site, N(6) is bonded to one Sr(1), one Sr(4), two equivalent Sr(3), and one Mo(2) atom to form distorted NSr4Mo square pyramids that share  a cornercorner with one N(3)Sr4Mo square pyramid,  a cornercorner with one N(5)Sr4Mo trigonal bipyramid,  an edgeedge with one N(6)Sr4Mo square pyramid, edges with two equivalent N(1)Sr3Mo2 square pyramids, and  an edgeedge with one N(5)Sr4Mo trigonal bipyramid. In the seventh N site, N(7) is bonded in a 6-coordinate geometry to one Sr(1), one Sr(4), one Sr(5), two equivalent Sr(3), and one Mo(2) atom.