Sr6CoC2N7 crystallizes in the orthorhombic P2_12_12 space group. There are three inequivalent Sr sites. In the first Sr site, Sr(1) is bonded to one N(2), one N(3), two equivalent N(1), and two equivalent N(4) atoms to form a mixture of distorted corner and edge-sharing SrN6 octahedra. The corner-sharing octahedra are not tilted. In the second Sr site, Sr(2) is bonded in a 3-coordinate geometry to one N(4) and two equivalent N(2) atoms. In the third Sr site, Sr(3) is bonded in a 4-coordinate geometry to one N(1), one N(3), and two equivalent N(2) atoms. Co(1) is bonded in a linear geometry to two equivalent N(2) atoms. C(1) is bonded in a linear geometry to one N(3) and one N(4) atom. There are four inequivalent N sites. In the first N site, N(1) is bonded to two equivalent Sr(3) and four equivalent Sr(1) atoms to form NSr6 octahedra that share edges with two equivalent N(1)Sr6 octahedra and edges with four equivalent N(2)Sr5Co octahedra. In the second N site, N(2) is bonded to one Sr(1), two equivalent Sr(2), two equivalent Sr(3), and one Co(1) atom to form distorted NSr5Co octahedra that share  a cornercorner with one N(2)Sr5Co octahedra, edges with two equivalent N(2)Sr5Co octahedra, and edges with two equivalent N(1)Sr6 octahedra. The corner-sharing octahedral tilt angles are 1°. In the third N site, N(3) is bonded in a distorted single-bond geometry to one Sr(1), one Sr(3), and one C(1) atom. In the fourth N site, N(4) is bonded in a 1-coordinate geometry to one Sr(2), two equivalent Sr(1), and one C(1) atom.
Sr6CoC2N7 crystallizes in the orthorhombic P2_12_12 space group. There are three inequivalent Sr sites. In the first Sr site, Sr(1) is bonded to one N(2), one N(3), two equivalent N(1), and two equivalent N(4) atoms to form a mixture of distorted corner and edge-sharing SrN6 octahedra. The corner-sharing octahedra are not tilted. The Sr(1)-N(2) bond length is 2.72 Å. The Sr(1)-N(3) bond length is 2.68 Å. There is one shorter (2.61 Å) and one longer (2.63 Å) Sr(1)-N(1) bond length. There is one shorter (2.72 Å) and one longer (3.10 Å) Sr(1)-N(4) bond length. In the second Sr site, Sr(2) is bonded in a 3-coordinate geometry to one N(4) and two equivalent N(2) atoms. The Sr(2)-N(4) bond length is 2.63 Å. There is one shorter (2.53 Å) and one longer (2.72 Å) Sr(2)-N(2) bond length. In the third Sr site, Sr(3) is bonded in a 4-coordinate geometry to one N(1), one N(3), and two equivalent N(2) atoms. The Sr(3)-N(1) bond length is 2.58 Å. The Sr(3)-N(3) bond length is 2.81 Å. There is one shorter (2.59 Å) and one longer (2.76 Å) Sr(3)-N(2) bond length. Co(1) is bonded in a linear geometry to two equivalent N(2) atoms. Both Co(1)-N(2) bond lengths are 1.83 Å. C(1) is bonded in a linear geometry to one N(3) and one N(4) atom. The C(1)-N(3) bond length is 1.25 Å. The C(1)-N(4) bond length is 1.24 Å. There are four inequivalent N sites. In the first N site, N(1) is bonded to two equivalent Sr(3) and four equivalent Sr(1) atoms to form NSr6 octahedra that share edges with two equivalent N(1)Sr6 octahedra and edges with four equivalent N(2)Sr5Co octahedra. In the second N site, N(2) is bonded to one Sr(1), two equivalent Sr(2), two equivalent Sr(3), and one Co(1) atom to form distorted NSr5Co octahedra that share  a cornercorner with one N(2)Sr5Co octahedra, edges with two equivalent N(2)Sr5Co octahedra, and edges with two equivalent N(1)Sr6 octahedra. The corner-sharing octahedral tilt angles are 1°. In the third N site, N(3) is bonded in a distorted single-bond geometry to one Sr(1), one Sr(3), and one C(1) atom. In the fourth N site, N(4) is bonded in a 1-coordinate geometry to one Sr(2), two equivalent Sr(1), and one C(1) atom.