Sr3Cr3N5 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 6-coordinate geometry to one N(1), one N(3), one N(4), one N(5), and two equivalent N(2) atoms. In the second Sr site, Sr(2) is bonded in a 6-coordinate geometry to one N(1), one N(3), one N(4), and three equivalent N(5) atoms. In the third Sr site, Sr(3) is bonded in a 5-coordinate geometry to one N(1), one N(2), one N(4), and two equivalent N(3) atoms. There are three inequivalent Cr sites. In the first Cr site, Cr(1) is bonded to one N(1), one N(5), and two equivalent N(3) atoms to form a mixture of edge and corner-sharing CrN4 tetrahedra. In the second Cr site, Cr(2) is bonded to one N(1), one N(2), and two equivalent N(4) atoms to form a mixture of edge and corner-sharing CrN4 tetrahedra. In the third Cr site, Cr(3) is bonded to one N(1), one N(2), one N(4), and one N(5) atom to form a mixture of edge and corner-sharing CrN4 tetrahedra. There are five inequivalent N sites. In the first N site, N(1) is bonded in a 3-coordinate geometry to one Sr(1), one Sr(2), one Sr(3), one Cr(1), one Cr(2), and one Cr(3) atom. In the second N site, N(2) is bonded in a 5-coordinate geometry to one Sr(3), two equivalent Sr(1), one Cr(2), and one Cr(3) atom. In the third N site, N(3) is bonded to one Sr(1), one Sr(2), two equivalent Sr(3), and two equivalent Cr(1) atoms to form distorted edge-sharing NSr4Cr2 octahedra. In the fourth N site, N(4) is bonded in a 6-coordinate geometry to one Sr(1), one Sr(2), one Sr(3), one Cr(3), and two equivalent Cr(2) atoms. In the fifth N site, N(5) is bonded in a 2-coordinate geometry to one Sr(1), three equivalent Sr(2), one Cr(1), and one Cr(3) atom.
Sr3Cr3N5 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 6-coordinate geometry to one N(1), one N(3), one N(4), one N(5), and two equivalent N(2) atoms. The Sr(1)-N(1) bond length is 3.05 Å. The Sr(1)-N(3) bond length is 2.63 Å. The Sr(1)-N(4) bond length is 2.66 Å. The Sr(1)-N(5) bond length is 3.04 Å. There is one shorter (2.57 Å) and one longer (2.74 Å) Sr(1)-N(2) bond length. In the second Sr site, Sr(2) is bonded in a 6-coordinate geometry to one N(1), one N(3), one N(4), and three equivalent N(5) atoms. The Sr(2)-N(1) bond length is 2.68 Å. The Sr(2)-N(3) bond length is 2.66 Å. The Sr(2)-N(4) bond length is 2.72 Å. There are a spread of Sr(2)-N(5) bond distances ranging from 2.66-2.98 Å. In the third Sr site, Sr(3) is bonded in a 5-coordinate geometry to one N(1), one N(2), one N(4), and two equivalent N(3) atoms. The Sr(3)-N(1) bond length is 2.67 Å. The Sr(3)-N(2) bond length is 2.54 Å. The Sr(3)-N(4) bond length is 2.74 Å. There is one shorter (2.52 Å) and one longer (2.64 Å) Sr(3)-N(3) bond length. There are three inequivalent Cr sites. In the first Cr site, Cr(1) is bonded to one N(1), one N(5), and two equivalent N(3) atoms to form a mixture of edge and corner-sharing CrN4 tetrahedra. The Cr(1)-N(1) bond length is 1.88 Å. The Cr(1)-N(5) bond length is 1.86 Å. There is one shorter (1.87 Å) and one longer (1.89 Å) Cr(1)-N(3) bond length. In the second Cr site, Cr(2) is bonded to one N(1), one N(2), and two equivalent N(4) atoms to form a mixture of edge and corner-sharing CrN4 tetrahedra. The Cr(2)-N(1) bond length is 1.92 Å. The Cr(2)-N(2) bond length is 1.86 Å. There is one shorter (1.93 Å) and one longer (1.95 Å) Cr(2)-N(4) bond length. In the third Cr site, Cr(3) is bonded to one N(1), one N(2), one N(4), and one N(5) atom to form a mixture of edge and corner-sharing CrN4 tetrahedra. The Cr(3)-N(1) bond length is 2.00 Å. The Cr(3)-N(2) bond length is 1.91 Å. The Cr(3)-N(4) bond length is 1.92 Å. The Cr(3)-N(5) bond length is 1.83 Å. There are five inequivalent N sites. In the first N site, N(1) is bonded in a 3-coordinate geometry to one Sr(1), one Sr(2), one Sr(3), one Cr(1), one Cr(2), and one Cr(3) atom. In the second N site, N(2) is bonded in a 5-coordinate geometry to one Sr(3), two equivalent Sr(1), one Cr(2), and one Cr(3) atom. In the third N site, N(3) is bonded to one Sr(1), one Sr(2), two equivalent Sr(3), and two equivalent Cr(1) atoms to form distorted edge-sharing NSr4Cr2 octahedra. In the fourth N site, N(4) is bonded in a 6-coordinate geometry to one Sr(1), one Sr(2), one Sr(3), one Cr(3), and two equivalent Cr(2) atoms. In the fifth N site, N(5) is bonded in a 2-coordinate geometry to one Sr(1), three equivalent Sr(2), one Cr(1), and one Cr(3) atom.