Sr3B3N5 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), two equivalent N(2), and two equivalent N(4) atoms. In the second Sr site, Sr(2) is bonded in a 5-coordinate geometry to one N(3), one N(4), one N(5), and two equivalent N(1) atoms. In the third Sr site, Sr(3) 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. There are three inequivalent B sites. In the first B site, B(1) is bonded in a distorted trigonal planar geometry to one N(5) and two equivalent N(3) atoms. In the second B site, B(2) is bonded in a distorted trigonal planar geometry to one N(1), one N(2), and one N(4) atom. In the third B site, B(3) is bonded in a distorted trigonal planar geometry to one N(1), one N(2), and one N(5) atom. There are five inequivalent N sites. In the first N site, N(1) is bonded in a 2-coordinate geometry to one Sr(1), one Sr(3), two equivalent Sr(2), one B(2), and one B(3) atom. In the second N site, N(2) is bonded in a 2-coordinate geometry to two equivalent Sr(1), two equivalent Sr(3), one B(2), and one B(3) atom. In the third N site, N(3) is bonded to one Sr(1), one Sr(2), one Sr(3), and two equivalent B(1) atoms to form distorted edge-sharing NSr3B2 trigonal bipyramids. In the fourth N site, N(4) is bonded in a distorted single-bond geometry to one Sr(2), one Sr(3), two equivalent Sr(1), and one B(2) atom. In the fifth N site, N(5) is bonded in a distorted rectangular see-saw-like geometry to one Sr(2), one Sr(3), one B(1), and one B(3) atom.
Sr3B3N5 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), two equivalent N(2), and two equivalent N(4) atoms. The Sr(1)-N(1) bond length is 2.68 Å. The Sr(1)-N(3) bond length is 2.59 Å. There is one shorter (2.87 Å) and one longer (3.26 Å) Sr(1)-N(2) bond length. Both Sr(1)-N(4) bond lengths are 2.61 Å. In the second Sr site, Sr(2) is bonded in a 5-coordinate geometry to one N(3), one N(4), one N(5), and two equivalent N(1) atoms. The Sr(2)-N(3) bond length is 2.57 Å. The Sr(2)-N(4) bond length is 2.50 Å. The Sr(2)-N(5) bond length is 2.62 Å. There is one shorter (2.67 Å) and one longer (2.78 Å) Sr(2)-N(1) bond length. In the third Sr site, Sr(3) 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(3)-N(1) bond length is 2.83 Å. The Sr(3)-N(3) bond length is 2.67 Å. The Sr(3)-N(4) bond length is 2.63 Å. The Sr(3)-N(5) bond length is 2.74 Å. Both Sr(3)-N(2) bond lengths are 2.74 Å. There are three inequivalent B sites. In the first B site, B(1) is bonded in a distorted trigonal planar geometry to one N(5) and two equivalent N(3) atoms. The B(1)-N(5) bond length is 1.42 Å. There is one shorter (1.50 Å) and one longer (1.51 Å) B(1)-N(3) bond length. In the second B site, B(2) is bonded in a distorted trigonal planar geometry to one N(1), one N(2), and one N(4) atom. The B(2)-N(1) bond length is 1.52 Å. The B(2)-N(2) bond length is 1.57 Å. The B(2)-N(4) bond length is 1.41 Å. In the third B site, B(3) is bonded in a distorted trigonal planar geometry to one N(1), one N(2), and one N(5) atom. The B(3)-N(1) bond length is 1.52 Å. The B(3)-N(2) bond length is 1.49 Å. The B(3)-N(5) bond length is 1.43 Å. There are five inequivalent N sites. In the first N site, N(1) is bonded in a 2-coordinate geometry to one Sr(1), one Sr(3), two equivalent Sr(2), one B(2), and one B(3) atom. In the second N site, N(2) is bonded in a 2-coordinate geometry to two equivalent Sr(1), two equivalent Sr(3), one B(2), and one B(3) atom. In the third N site, N(3) is bonded to one Sr(1), one Sr(2), one Sr(3), and two equivalent B(1) atoms to form distorted edge-sharing NSr3B2 trigonal bipyramids. In the fourth N site, N(4) is bonded in a distorted single-bond geometry to one Sr(2), one Sr(3), two equivalent Sr(1), and one B(2) atom. In the fifth N site, N(5) is bonded in a distorted rectangular see-saw-like geometry to one Sr(2), one Sr(3), one B(1), and one B(3) atom.