SrCr7N10 crystallizes in the monoclinic Pc space group. Sr(1) is bonded in a 5-coordinate geometry to one N(2), one N(4), one N(7), and two equivalent N(1) atoms. There are seven inequivalent Cr sites. In the first Cr site, Cr(1) is bonded to one N(1), one N(2), one N(3), and one N(6) atom to form a mixture of corner and edge-sharing CrN4 tetrahedra. In the second Cr site, Cr(2) is bonded to one N(2), one N(3), one N(4), and one N(6) atom to form a mixture of corner and edge-sharing CrN4 tetrahedra. In the third Cr site, Cr(3) is bonded to one N(4), one N(5), one N(7), and one N(8) atom to form corner-sharing CrN4 tetrahedra. In the fourth Cr site, Cr(4) is bonded to one N(10), one N(2), one N(7), and one N(9) atom to form corner-sharing CrN4 tetrahedra. In the fifth Cr site, Cr(5) is bonded to one N(1), one N(7), one N(8), and one N(9) atom to form corner-sharing CrN4 tetrahedra. In the sixth Cr site, Cr(6) is bonded to one N(10), one N(3), one N(5), and one N(8) atom to form corner-sharing CrN4 tetrahedra. In the seventh Cr site, Cr(7) is bonded to one N(10), one N(5), one N(6), and one N(9) atom to form corner-sharing CrN4 tetrahedra. There are ten inequivalent N sites. In the first N site, N(9) is bonded in a distorted trigonal non-coplanar geometry to one Cr(4), one Cr(5), and one Cr(7) atom. In the second N site, N(10) is bonded in a distorted trigonal non-coplanar geometry to one Cr(4), one Cr(6), and one Cr(7) atom. In the third N site, N(1) is bonded in a distorted bent 150 degrees geometry to two equivalent Sr(1), one Cr(1), and one Cr(5) atom. In the fourth N site, N(2) is bonded in a 4-coordinate geometry to one Sr(1), one Cr(1), one Cr(2), and one Cr(4) atom. In the fifth N site, N(3) is bonded in a distorted T-shaped geometry to one Cr(1), one Cr(2), and one Cr(6) atom. In the sixth N site, N(4) is bonded in a 3-coordinate geometry to one Sr(1), one Cr(2), and one Cr(3) atom. In the seventh N site, N(5) is bonded in a trigonal non-coplanar geometry to one Cr(3), one Cr(6), and one Cr(7) atom. In the eighth N site, N(6) is bonded in a trigonal planar geometry to one Cr(1), one Cr(2), and one Cr(7) atom. In the ninth N site, N(7) is bonded in a distorted trigonal pyramidal geometry to one Sr(1), one Cr(3), one Cr(4), and one Cr(5) atom. In the tenth N site, N(8) is bonded in a trigonal non-coplanar geometry to one Cr(3), one Cr(5), and one Cr(6) atom.
SrCr7N10 crystallizes in the monoclinic Pc space group. Sr(1) is bonded in a 5-coordinate geometry to one N(2), one N(4), one N(7), and two equivalent N(1) atoms. The Sr(1)-N(2) bond length is 2.72 Å. The Sr(1)-N(4) bond length is 2.69 Å. The Sr(1)-N(7) bond length is 2.72 Å. There is one shorter (2.80 Å) and one longer (2.98 Å) Sr(1)-N(1) bond length. There are seven inequivalent Cr sites. In the first Cr site, Cr(1) is bonded to one N(1), one N(2), one N(3), and one N(6) atom to form a mixture of corner and edge-sharing CrN4 tetrahedra. The Cr(1)-N(1) bond length is 1.76 Å. The Cr(1)-N(2) bond length is 1.86 Å. The Cr(1)-N(3) bond length is 1.83 Å. The Cr(1)-N(6) bond length is 1.83 Å. In the second Cr site, Cr(2) is bonded to one N(2), one N(3), one N(4), and one N(6) atom to form a mixture of corner and edge-sharing CrN4 tetrahedra. The Cr(2)-N(2) bond length is 1.80 Å. The Cr(2)-N(3) bond length is 1.86 Å. The Cr(2)-N(4) bond length is 1.75 Å. The Cr(2)-N(6) bond length is 1.82 Å. In the third Cr site, Cr(3) is bonded to one N(4), one N(5), one N(7), and one N(8) atom to form corner-sharing CrN4 tetrahedra. The Cr(3)-N(4) bond length is 1.79 Å. The Cr(3)-N(5) bond length is 1.83 Å. The Cr(3)-N(7) bond length is 1.83 Å. The Cr(3)-N(8) bond length is 1.82 Å. In the fourth Cr site, Cr(4) is bonded to one N(10), one N(2), one N(7), and one N(9) atom to form corner-sharing CrN4 tetrahedra. The Cr(4)-N(10) bond length is 1.77 Å. The Cr(4)-N(2) bond length is 1.81 Å. The Cr(4)-N(7) bond length is 1.90 Å. The Cr(4)-N(9) bond length is 1.86 Å. In the fifth Cr site, Cr(5) is bonded to one N(1), one N(7), one N(8), and one N(9) atom to form corner-sharing CrN4 tetrahedra. The Cr(5)-N(1) bond length is 1.80 Å. The Cr(5)-N(7) bond length is 1.84 Å. The Cr(5)-N(8) bond length is 1.81 Å. The Cr(5)-N(9) bond length is 1.78 Å. In the sixth Cr site, Cr(6) is bonded to one N(10), one N(3), one N(5), and one N(8) atom to form corner-sharing CrN4 tetrahedra. The Cr(6)-N(10) bond length is 1.89 Å. The Cr(6)-N(3) bond length is 1.80 Å. The Cr(6)-N(5) bond length is 1.84 Å. The Cr(6)-N(8) bond length is 1.85 Å. In the seventh Cr site, Cr(7) is bonded to one N(10), one N(5), one N(6), and one N(9) atom to form corner-sharing CrN4 tetrahedra. The Cr(7)-N(10) bond length is 1.84 Å. The Cr(7)-N(5) bond length is 1.82 Å. The Cr(7)-N(6) bond length is 1.80 Å. The Cr(7)-N(9) bond length is 1.82 Å. There are ten inequivalent N sites. In the first N site, N(9) is bonded in a distorted trigonal non-coplanar geometry to one Cr(4), one Cr(5), and one Cr(7) atom. In the second N site, N(10) is bonded in a distorted trigonal non-coplanar geometry to one Cr(4), one Cr(6), and one Cr(7) atom. In the third N site, N(1) is bonded in a distorted bent 150 degrees geometry to two equivalent Sr(1), one Cr(1), and one Cr(5) atom. In the fourth N site, N(2) is bonded in a 4-coordinate geometry to one Sr(1), one Cr(1), one Cr(2), and one Cr(4) atom. In the fifth N site, N(3) is bonded in a distorted T-shaped geometry to one Cr(1), one Cr(2), and one Cr(6) atom. In the sixth N site, N(4) is bonded in a 3-coordinate geometry to one Sr(1), one Cr(2), and one Cr(3) atom. In the seventh N site, N(5) is bonded in a trigonal non-coplanar geometry to one Cr(3), one Cr(6), and one Cr(7) atom. In the eighth N site, N(6) is bonded in a trigonal planar geometry to one Cr(1), one Cr(2), and one Cr(7) atom. In the ninth N site, N(7) is bonded in a distorted trigonal pyramidal geometry to one Sr(1), one Cr(3), one Cr(4), and one Cr(5) atom. In the tenth N site, N(8) is bonded in a trigonal non-coplanar geometry to one Cr(3), one Cr(5), and one Cr(6) atom.