Sr3(TaN2)2 crystallizes in the monoclinic C2/c space group. There are two inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a distorted rectangular see-saw-like geometry to one N(2) and three equivalent N(1) atoms. In the second Sr site, Sr(2) is bonded in a 6-coordinate geometry to two equivalent N(1) and four equivalent N(2) atoms. Ta(1) is bonded to two equivalent N(1) and two equivalent N(2) atoms to form a mixture of distorted corner and edge-sharing TaN4 tetrahedra. There are two inequivalent N sites. In the first N site, N(1) is bonded in a 6-coordinate geometry to one Sr(2), three equivalent Sr(1), and two equivalent Ta(1) atoms. In the second N site, N(2) is bonded in a 5-coordinate geometry to one Sr(1), two equivalent Sr(2), and two equivalent Ta(1) atoms.
Sr3(TaN2)2 crystallizes in the monoclinic C2/c space group. There are two inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a distorted rectangular see-saw-like geometry to one N(2) and three equivalent N(1) atoms. The Sr(1)-N(2) bond length is 2.62 Å. There are a spread of Sr(1)-N(1) bond distances ranging from 2.65-2.86 Å. In the second Sr site, Sr(2) is bonded in a 6-coordinate geometry to two equivalent N(1) and four equivalent N(2) atoms. Both Sr(2)-N(1) bond lengths are 3.21 Å. There are two shorter (2.59 Å) and two longer (2.83 Å) Sr(2)-N(2) bond lengths. Ta(1) is bonded to two equivalent N(1) and two equivalent N(2) atoms to form a mixture of distorted corner and edge-sharing TaN4 tetrahedra. There is one shorter (1.98 Å) and one longer (2.16 Å) Ta(1)-N(1) bond length. There is one shorter (2.03 Å) and one longer (2.04 Å) Ta(1)-N(2) bond length. There are two inequivalent N sites. In the first N site, N(1) is bonded in a 6-coordinate geometry to one Sr(2), three equivalent Sr(1), and two equivalent Ta(1) atoms. In the second N site, N(2) is bonded in a 5-coordinate geometry to one Sr(1), two equivalent Sr(2), and two equivalent Ta(1) atoms.