Sr4N3 crystallizes in the triclinic P1 space group. There are four inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a rectangular see-saw-like geometry to one N(1), one N(2), and two equivalent N(3) atoms. In the second Sr site, Sr(2) is bonded to one N(2), one N(3), and two equivalent N(1) atoms to form a mixture of distorted corner and edge-sharing SrN4 trigonal pyramids. In the third Sr site, Sr(3) is bonded to one N(2), one N(3), and two equivalent N(1) atoms to form a mixture of distorted corner and edge-sharing SrN4 trigonal pyramids. In the fourth Sr site, Sr(4) is bonded in a 5-coordinate geometry to one N(1), two equivalent N(2), and two equivalent N(3) atoms. There are three inequivalent N sites. In the first N site, N(1) is bonded to one Sr(1), one Sr(4), two equivalent Sr(2), and two equivalent Sr(3) atoms to form edge-sharing NSr6 octahedra. In the second N site, N(2) is bonded in a 5-coordinate geometry to one Sr(1), one Sr(2), one Sr(3), and two equivalent Sr(4) atoms. In the third N site, N(3) is bonded to one Sr(2), one Sr(3), two equivalent Sr(1), and two equivalent Sr(4) atoms to form distorted edge-sharing NSr6 octahedra.
Sr4N3 crystallizes in the triclinic P1 space group. There are four inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a rectangular see-saw-like geometry to one N(1), one N(2), and two equivalent N(3) atoms. The Sr(1)-N(1) bond length is 2.56 Å. The Sr(1)-N(2) bond length is 2.80 Å. There is one shorter (2.53 Å) and one longer (2.63 Å) Sr(1)-N(3) bond length. In the second Sr site, Sr(2) is bonded to one N(2), one N(3), and two equivalent N(1) atoms to form a mixture of distorted corner and edge-sharing SrN4 trigonal pyramids. The Sr(2)-N(2) bond length is 2.38 Å. The Sr(2)-N(3) bond length is 2.47 Å. There is one shorter (2.68 Å) and one longer (2.71 Å) Sr(2)-N(1) bond length. In the third Sr site, Sr(3) is bonded to one N(2), one N(3), and two equivalent N(1) atoms to form a mixture of distorted corner and edge-sharing SrN4 trigonal pyramids. The Sr(3)-N(2) bond length is 2.85 Å. The Sr(3)-N(3) bond length is 2.59 Å. There is one shorter (2.56 Å) and one longer (2.57 Å) Sr(3)-N(1) bond length. In the fourth Sr site, Sr(4) is bonded in a 5-coordinate geometry to one N(1), two equivalent N(2), and two equivalent N(3) atoms. The Sr(4)-N(1) bond length is 2.57 Å. There is one shorter (2.53 Å) and one longer (2.56 Å) Sr(4)-N(2) bond length. There is one shorter (2.82 Å) and one longer (2.85 Å) Sr(4)-N(3) bond length. There are three inequivalent N sites. In the first N site, N(1) is bonded to one Sr(1), one Sr(4), two equivalent Sr(2), and two equivalent Sr(3) atoms to form edge-sharing NSr6 octahedra. In the second N site, N(2) is bonded in a 5-coordinate geometry to one Sr(1), one Sr(2), one Sr(3), and two equivalent Sr(4) atoms. In the third N site, N(3) is bonded to one Sr(2), one Sr(3), two equivalent Sr(1), and two equivalent Sr(4) atoms to form distorted edge-sharing NSr6 octahedra.