Sr3(InN2)2 crystallizes in the orthorhombic Pnna space group. There are two inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 5-coordinate geometry to two equivalent N(1) and three equivalent N(2) atoms. In the second Sr site, Sr(2) is bonded to two equivalent N(2) and four equivalent N(1) atoms to form distorted SrN6 octahedra that share corners with six equivalent In(2)N4 trigonal pyramids, edges with two equivalent Sr(2)N6 octahedra, and edges with three equivalent In(1)N4 tetrahedra. There are two inequivalent In sites. In the first In site, In(1) is bonded to two equivalent N(1) and two equivalent N(2) atoms to form InN4 tetrahedra that share edges with three equivalent Sr(2)N6 octahedra and edges with two equivalent In(2)N4 trigonal pyramids. In the second In site, In(2) is bonded to two equivalent N(1) and two equivalent N(2) atoms to form distorted InN4 trigonal pyramids that share corners with six equivalent Sr(2)N6 octahedra and edges with two equivalent In(1)N4 tetrahedra. The corner-sharing octahedral tilt angles range from 29-80°. There are two inequivalent N sites. In the first N site, N(1) is bonded in a 6-coordinate geometry to two equivalent Sr(1), two equivalent Sr(2), one In(1), and one In(2) atom. In the second N site, N(2) is bonded to one Sr(2), three equivalent Sr(1), one In(1), and one In(2) atom to form a mixture of distorted edge, face, and corner-sharing NSr4In2 octahedra. The corner-sharing octahedral tilt angles range from 55-63°.
Sr3(InN2)2 crystallizes in the orthorhombic Pnna space group. There are two inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 5-coordinate geometry to two equivalent N(1) and three equivalent N(2) atoms. There is one shorter (2.58 Å) and one longer (3.15 Å) Sr(1)-N(1) bond length. There are a spread of Sr(1)-N(2) bond distances ranging from 2.54-2.91 Å. In the second Sr site, Sr(2) is bonded to two equivalent N(2) and four equivalent N(1) atoms to form distorted SrN6 octahedra that share corners with six equivalent In(2)N4 trigonal pyramids, edges with two equivalent Sr(2)N6 octahedra, and edges with three equivalent In(1)N4 tetrahedra. Both Sr(2)-N(2) bond lengths are 2.99 Å. There are two shorter (2.75 Å) and two longer (2.83 Å) Sr(2)-N(1) bond lengths. There are two inequivalent In sites. In the first In site, In(1) is bonded to two equivalent N(1) and two equivalent N(2) atoms to form InN4 tetrahedra that share edges with three equivalent Sr(2)N6 octahedra and edges with two equivalent In(2)N4 trigonal pyramids. Both In(1)-N(1) bond lengths are 2.20 Å. Both In(1)-N(2) bond lengths are 2.22 Å. In the second In site, In(2) is bonded to two equivalent N(1) and two equivalent N(2) atoms to form distorted InN4 trigonal pyramids that share corners with six equivalent Sr(2)N6 octahedra and edges with two equivalent In(1)N4 tetrahedra. The corner-sharing octahedral tilt angles range from 29-80°. Both In(2)-N(1) bond lengths are 2.33 Å. Both In(2)-N(2) bond lengths are 2.21 Å. There are two inequivalent N sites. In the first N site, N(1) is bonded in a 6-coordinate geometry to two equivalent Sr(1), two equivalent Sr(2), one In(1), and one In(2) atom. In the second N site, N(2) is bonded to one Sr(2), three equivalent Sr(1), one In(1), and one In(2) atom to form a mixture of distorted edge, face, and corner-sharing NSr4In2 octahedra. The corner-sharing octahedral tilt angles range from 55-63°.