Sr(DySe2)2 crystallizes in the orthorhombic Pnma space group. Sr(1) is bonded in a 8-coordinate geometry to two equivalent Se(1), two equivalent Se(2), two equivalent Se(3), and two equivalent Se(4) atoms. There are two inequivalent Dy sites. In the first Dy site, Dy(1) is bonded to one Se(2), two equivalent Se(4), and three equivalent Se(1) atoms to form a mixture of edge and corner-sharing DySe6 octahedra. The corner-sharing octahedral tilt angles range from 48-63°. In the second Dy site, Dy(2) is bonded to one Se(4), two equivalent Se(2), and three equivalent Se(3) atoms to form a mixture of edge and corner-sharing DySe6 octahedra. The corner-sharing octahedral tilt angles range from 48-63°. There are four inequivalent Se sites. In the first Se site, Se(1) is bonded to two equivalent Sr(1) and three equivalent Dy(1) atoms to form a mixture of distorted edge and corner-sharing SeSr2Dy3 trigonal bipyramids. In the second Se site, Se(2) is bonded to two equivalent Sr(1), one Dy(1), and two equivalent Dy(2) atoms to form a mixture of distorted edge and corner-sharing SeSr2Dy3 trigonal bipyramids. In the third Se site, Se(3) is bonded to two equivalent Sr(1) and three equivalent Dy(2) atoms to form a mixture of edge and corner-sharing SeSr2Dy3 square pyramids. In the fourth Se site, Se(4) is bonded to two equivalent Sr(1), one Dy(2), and two equivalent Dy(1) atoms to form a mixture of distorted edge and corner-sharing SeSr2Dy3 trigonal bipyramids.
Sr(DySe2)2 crystallizes in the orthorhombic Pnma space group. Sr(1) is bonded in a 8-coordinate geometry to two equivalent Se(1), two equivalent Se(2), two equivalent Se(3), and two equivalent Se(4) atoms. Both Sr(1)-Se(1) bond lengths are 3.24 Å. There is one shorter (3.44 Å) and one longer (3.45 Å) Sr(1)-Se(2) bond length. Both Sr(1)-Se(3) bond lengths are 3.21 Å. Both Sr(1)-Se(4) bond lengths are 3.23 Å. There are two inequivalent Dy sites. In the first Dy site, Dy(1) is bonded to one Se(2), two equivalent Se(4), and three equivalent Se(1) atoms to form a mixture of edge and corner-sharing DySe6 octahedra. The corner-sharing octahedral tilt angles range from 48-63°. The Dy(1)-Se(2) bond length is 2.83 Å. Both Dy(1)-Se(4) bond lengths are 2.89 Å. There is one shorter (2.84 Å) and two longer (2.87 Å) Dy(1)-Se(1) bond lengths. In the second Dy site, Dy(2) is bonded to one Se(4), two equivalent Se(2), and three equivalent Se(3) atoms to form a mixture of edge and corner-sharing DySe6 octahedra. The corner-sharing octahedral tilt angles range from 48-63°. The Dy(2)-Se(4) bond length is 2.88 Å. Both Dy(2)-Se(2) bond lengths are 2.80 Å. There is one shorter (2.86 Å) and two longer (2.88 Å) Dy(2)-Se(3) bond lengths. There are four inequivalent Se sites. In the first Se site, Se(1) is bonded to two equivalent Sr(1) and three equivalent Dy(1) atoms to form a mixture of distorted edge and corner-sharing SeSr2Dy3 trigonal bipyramids. In the second Se site, Se(2) is bonded to two equivalent Sr(1), one Dy(1), and two equivalent Dy(2) atoms to form a mixture of distorted edge and corner-sharing SeSr2Dy3 trigonal bipyramids. In the third Se site, Se(3) is bonded to two equivalent Sr(1) and three equivalent Dy(2) atoms to form a mixture of edge and corner-sharing SeSr2Dy3 square pyramids. In the fourth Se site, Se(4) is bonded to two equivalent Sr(1), one Dy(2), and two equivalent Dy(1) atoms to form a mixture of distorted edge and corner-sharing SeSr2Dy3 trigonal bipyramids.