Sr8Co3N8 crystallizes in the monoclinic C2/m space group. There are four inequivalent Sr sites. In the first Sr site, Sr(1) is bonded to one N(2), two equivalent N(1), and two equivalent N(4) atoms to form a mixture of distorted corner and edge-sharing SrN5 square pyramids. In the second Sr site, Sr(2) is bonded in a 5-coordinate geometry to one N(3), one N(4), and three equivalent N(2) atoms. In the third Sr site, Sr(3) is bonded to one N(3), two equivalent N(1), and two equivalent N(4) atoms to form a mixture of distorted corner and edge-sharing SrN5 trigonal bipyramids. In the fourth Sr site, Sr(4) is bonded to one N(1), one N(2), and three equivalent N(3) atoms to form a mixture of distorted corner and edge-sharing SrN5 trigonal bipyramids. There are two inequivalent Co sites. In the first Co site, Co(1) is bonded in a linear geometry to two equivalent N(4) atoms. In the second Co site, Co(2) is bonded in a trigonal planar geometry to one N(1), one N(2), and one N(3) atom. There are four inequivalent N sites. In the first N site, N(1) is bonded to one Sr(4), two equivalent Sr(1), two equivalent Sr(3), and one Co(2) atom to form a mixture of distorted corner and edge-sharing NSr5Co octahedra. The corner-sharing octahedral tilt angles range from 16-49°. In the second N site, N(2) is bonded to one Sr(1), one Sr(4), three equivalent Sr(2), and one Co(2) atom to form a mixture of distorted corner and edge-sharing NSr5Co octahedra. The corner-sharing octahedral tilt angles range from 17-49°. In the third N site, N(3) is bonded to one Sr(2), one Sr(3), three equivalent Sr(4), and one Co(2) atom to form a mixture of distorted corner and edge-sharing NSr5Co octahedra. The corner-sharing octahedral tilt angles range from 18-63°. In the fourth N site, N(4) is bonded to one Sr(2), two equivalent Sr(1), two equivalent Sr(3), and one Co(1) atom to form a mixture of distorted corner and edge-sharing NSr5Co octahedra. The corner-sharing octahedral tilt angles range from 0-63°.
Sr8Co3N8 crystallizes in the monoclinic C2/m space group. There are four inequivalent Sr sites. In the first Sr site, Sr(1) is bonded to one N(2), two equivalent N(1), and two equivalent N(4) atoms to form a mixture of distorted corner and edge-sharing SrN5 square pyramids. The Sr(1)-N(2) bond length is 2.70 Å. There is one shorter (2.67 Å) and one longer (2.80 Å) Sr(1)-N(1) bond length. Both Sr(1)-N(4) bond lengths are 2.68 Å. In the second Sr site, Sr(2) is bonded in a 5-coordinate geometry to one N(3), one N(4), and three equivalent N(2) atoms. The Sr(2)-N(3) bond length is 2.61 Å. The Sr(2)-N(4) bond length is 2.63 Å. There are two shorter (2.70 Å) and one longer (2.81 Å) Sr(2)-N(2) bond length. In the third Sr site, Sr(3) is bonded to one N(3), two equivalent N(1), and two equivalent N(4) atoms to form a mixture of distorted corner and edge-sharing SrN5 trigonal bipyramids. The Sr(3)-N(3) bond length is 2.81 Å. Both Sr(3)-N(1) bond lengths are 2.70 Å. There is one shorter (2.50 Å) and one longer (3.06 Å) Sr(3)-N(4) bond length. In the fourth Sr site, Sr(4) is bonded to one N(1), one N(2), and three equivalent N(3) atoms to form a mixture of distorted corner and edge-sharing SrN5 trigonal bipyramids. The Sr(4)-N(1) bond length is 2.61 Å. The Sr(4)-N(2) bond length is 2.73 Å. There is one shorter (2.65 Å) and two longer (2.70 Å) Sr(4)-N(3) bond lengths. There are two inequivalent Co sites. In the first Co site, Co(1) is bonded in a linear geometry to two equivalent N(4) atoms. Both Co(1)-N(4) bond lengths are 1.80 Å. In the second Co site, Co(2) is bonded in a trigonal planar geometry to one N(1), one N(2), and one N(3) atom. The Co(2)-N(1) bond length is 1.78 Å. The Co(2)-N(2) bond length is 1.74 Å. The Co(2)-N(3) bond length is 1.77 Å. There are four inequivalent N sites. In the first N site, N(1) is bonded to one Sr(4), two equivalent Sr(1), two equivalent Sr(3), and one Co(2) atom to form a mixture of distorted corner and edge-sharing NSr5Co octahedra. The corner-sharing octahedral tilt angles range from 16-49°. In the second N site, N(2) is bonded to one Sr(1), one Sr(4), three equivalent Sr(2), and one Co(2) atom to form a mixture of distorted corner and edge-sharing NSr5Co octahedra. The corner-sharing octahedral tilt angles range from 17-49°. In the third N site, N(3) is bonded to one Sr(2), one Sr(3), three equivalent Sr(4), and one Co(2) atom to form a mixture of distorted corner and edge-sharing NSr5Co octahedra. The corner-sharing octahedral tilt angles range from 18-63°. In the fourth N site, N(4) is bonded to one Sr(2), two equivalent Sr(1), two equivalent Sr(3), and one Co(1) atom to form a mixture of distorted corner and edge-sharing NSr5Co octahedra. The corner-sharing octahedral tilt angles range from 0-63°.