Cr4In2(CuSe4)3 is Spinel-derived structured and crystallizes in the monoclinic C2/m space group. There are three inequivalent Cr sites. In the first Cr site, Cr(1) is bonded to one Se(1), one Se(3), two equivalent Se(7), and two equivalent Se(9) atoms to form CrSe6 octahedra that share  a cornercorner with one Cu(2)Se4 tetrahedra, corners with two equivalent Cu(3)Se4 tetrahedra, corners with three equivalent Cu(1)Se4 tetrahedra,  an edgeedge with one In(1)Se6 octahedra,  an edgeedge with one In(2)Se6 octahedra, and edges with four equivalent Cr(3)Se6 octahedra. In the second Cr site, Cr(2) is bonded to two equivalent Se(2), two equivalent Se(5), and two equivalent Se(8) atoms to form CrSe6 octahedra that share corners with two equivalent Cu(3)Se4 tetrahedra, corners with four equivalent Cu(2)Se4 tetrahedra, edges with two equivalent Cr(2)Se6 octahedra, edges with two equivalent In(1)Se6 octahedra, and edges with two equivalent In(3)Se6 octahedra. In the third Cr site, Cr(3) is bonded to one Se(1), one Se(3), one Se(4), one Se(6), one Se(7), and one Se(9) atom to form CrSe6 octahedra that share  a cornercorner with one Cu(2)Se4 tetrahedra, corners with two equivalent Cu(3)Se4 tetrahedra, corners with three equivalent Cu(1)Se4 tetrahedra,  an edgeedge with one In(1)Se6 octahedra,  an edgeedge with one In(2)Se6 octahedra, edges with two equivalent Cr(1)Se6 octahedra, and edges with two equivalent Cr(3)Se6 octahedra. There are three inequivalent Cu sites. In the first Cu site, Cu(1) is bonded to one Se(3), one Se(4), and two equivalent Se(7) atoms to form CuSe4 tetrahedra that share corners with three equivalent Cr(1)Se6 octahedra, corners with three equivalent In(2)Se6 octahedra, and corners with six equivalent Cr(3)Se6 octahedra. The corner-sharing octahedral tilt angles range from 54-64°. In the second Cu site, Cu(2) is bonded to one Se(1), one Se(5), and two equivalent Se(8) atoms to form CuSe4 tetrahedra that share  a cornercorner with one Cr(1)Se6 octahedra, corners with two equivalent Cr(3)Se6 octahedra, corners with two equivalent In(3)Se6 octahedra, corners with three equivalent In(1)Se6 octahedra, and corners with four equivalent Cr(2)Se6 octahedra. The corner-sharing octahedral tilt angles range from 48-65°. In the third Cu site, Cu(3) is bonded to one Se(2), one Se(6), and two equivalent Se(9) atoms to form CuSe4 tetrahedra that share  a cornercorner with one In(3)Se6 octahedra, corners with two equivalent Cr(1)Se6 octahedra, corners with two equivalent Cr(2)Se6 octahedra, corners with three equivalent In(1)Se6 octahedra, and corners with four equivalent Cr(3)Se6 octahedra. The corner-sharing octahedral tilt angles range from 53-64°. There are three inequivalent In sites. In the first In site, In(1) is bonded to one Se(5), one Se(6), two equivalent Se(8), and two equivalent Se(9) atoms to form InSe6 octahedra that share corners with three equivalent Cu(2)Se4 tetrahedra, corners with three equivalent Cu(3)Se4 tetrahedra,  an edgeedge with one Cr(1)Se6 octahedra,  an edgeedge with one In(3)Se6 octahedra, edges with two equivalent Cr(2)Se6 octahedra, and edges with two equivalent Cr(3)Se6 octahedra. In the second In site, In(2) is bonded to two equivalent Se(4) and four equivalent Se(7) atoms to form InSe6 octahedra that share corners with six equivalent Cu(1)Se4 tetrahedra, edges with two equivalent Cr(1)Se6 octahedra, and edges with four equivalent Cr(3)Se6 octahedra. In the third In site, In(3) is bonded to two equivalent Se(2) and four equivalent Se(8) atoms to form InSe6 octahedra that share corners with two equivalent Cu(3)Se4 tetrahedra, corners with four equivalent Cu(2)Se4 tetrahedra, edges with two equivalent In(1)Se6 octahedra, and edges with four equivalent Cr(2)Se6 octahedra. There are nine inequivalent Se sites. In the first Se site, Se(1) is bonded in a distorted rectangular see-saw-like geometry to one Cr(1), two equivalent Cr(3), and one Cu(2) atom. In the second Se site, Se(2) is bonded in a rectangular see-saw-like geometry to two equivalent Cr(2), one Cu(3), and one In(3) atom. In the third Se site, Se(3) is bonded in a distorted rectangular see-saw-like geometry to one Cr(1), two equivalent Cr(3), and one Cu(1) atom. In the fourth Se site, Se(4) is bonded in a rectangular see-saw-like geometry to two equivalent Cr(3), one Cu(1), and one In(2) atom. In the fifth Se site, Se(5) is bonded in a rectangular see-saw-like geometry to two equivalent Cr(2), one Cu(2), and one In(1) atom. In the sixth Se site, Se(6) is bonded in a rectangular see-saw-like geometry to two equivalent Cr(3), one Cu(3), and one In(1) atom. In the seventh Se site, Se(7) is bonded in a rectangular see-saw-like geometry to one Cr(1), one Cr(3), one Cu(1), and one In(2) atom. In the eighth Se site, Se(8) is bonded in a rectangular see-saw-like geometry to one Cr(2), one Cu(2), one In(1), and one In(3) atom. In the ninth Se site, Se(9) is bonded in a rectangular see-saw-like geometry to one Cr(1), one Cr(3), one Cu(3), and one In(1) atom.
Cr4In2(CuSe4)3 is Spinel-derived structured and crystallizes in the monoclinic C2/m space group. There are three inequivalent Cr sites. In the first Cr site, Cr(1) is bonded to one Se(1), one Se(3), two equivalent Se(7), and two equivalent Se(9) atoms to form CrSe6 octahedra that share  a cornercorner with one Cu(2)Se4 tetrahedra, corners with two equivalent Cu(3)Se4 tetrahedra, corners with three equivalent Cu(1)Se4 tetrahedra,  an edgeedge with one In(1)Se6 octahedra,  an edgeedge with one In(2)Se6 octahedra, and edges with four equivalent Cr(3)Se6 octahedra. The Cr(1)-Se(1) bond length is 2.58 Å. The Cr(1)-Se(3) bond length is 2.58 Å. Both Cr(1)-Se(7) bond lengths are 2.54 Å. Both Cr(1)-Se(9) bond lengths are 2.53 Å. In the second Cr site, Cr(2) is bonded to two equivalent Se(2), two equivalent Se(5), and two equivalent Se(8) atoms to form CrSe6 octahedra that share corners with two equivalent Cu(3)Se4 tetrahedra, corners with four equivalent Cu(2)Se4 tetrahedra, edges with two equivalent Cr(2)Se6 octahedra, edges with two equivalent In(1)Se6 octahedra, and edges with two equivalent In(3)Se6 octahedra. Both Cr(2)-Se(2) bond lengths are 2.56 Å. Both Cr(2)-Se(5) bond lengths are 2.55 Å. Both Cr(2)-Se(8) bond lengths are 2.52 Å. In the third Cr site, Cr(3) is bonded to one Se(1), one Se(3), one Se(4), one Se(6), one Se(7), and one Se(9) atom to form CrSe6 octahedra that share  a cornercorner with one Cu(2)Se4 tetrahedra, corners with two equivalent Cu(3)Se4 tetrahedra, corners with three equivalent Cu(1)Se4 tetrahedra,  an edgeedge with one In(1)Se6 octahedra,  an edgeedge with one In(2)Se6 octahedra, edges with two equivalent Cr(1)Se6 octahedra, and edges with two equivalent Cr(3)Se6 octahedra. The Cr(3)-Se(1) bond length is 2.58 Å. The Cr(3)-Se(3) bond length is 2.57 Å. The Cr(3)-Se(4) bond length is 2.54 Å. The Cr(3)-Se(6) bond length is 2.54 Å. The Cr(3)-Se(7) bond length is 2.55 Å. The Cr(3)-Se(9) bond length is 2.55 Å. There are three inequivalent Cu sites. In the first Cu site, Cu(1) is bonded to one Se(3), one Se(4), and two equivalent Se(7) atoms to form CuSe4 tetrahedra that share corners with three equivalent Cr(1)Se6 octahedra, corners with three equivalent In(2)Se6 octahedra, and corners with six equivalent Cr(3)Se6 octahedra. The corner-sharing octahedral tilt angles range from 54-64°. The Cu(1)-Se(3) bond length is 2.50 Å. The Cu(1)-Se(4) bond length is 2.43 Å. Both Cu(1)-Se(7) bond lengths are 2.43 Å. In the second Cu site, Cu(2) is bonded to one Se(1), one Se(5), and two equivalent Se(8) atoms to form CuSe4 tetrahedra that share  a cornercorner with one Cr(1)Se6 octahedra, corners with two equivalent Cr(3)Se6 octahedra, corners with two equivalent In(3)Se6 octahedra, corners with three equivalent In(1)Se6 octahedra, and corners with four equivalent Cr(2)Se6 octahedra. The corner-sharing octahedral tilt angles range from 48-65°. The Cu(2)-Se(1) bond length is 2.49 Å. The Cu(2)-Se(5) bond length is 2.42 Å. Both Cu(2)-Se(8) bond lengths are 2.40 Å. In the third Cu site, Cu(3) is bonded to one Se(2), one Se(6), and two equivalent Se(9) atoms to form CuSe4 tetrahedra that share  a cornercorner with one In(3)Se6 octahedra, corners with two equivalent Cr(1)Se6 octahedra, corners with two equivalent Cr(2)Se6 octahedra, corners with three equivalent In(1)Se6 octahedra, and corners with four equivalent Cr(3)Se6 octahedra. The corner-sharing octahedral tilt angles range from 53-64°. The Cu(3)-Se(2) bond length is 2.46 Å. The Cu(3)-Se(6) bond length is 2.43 Å. Both Cu(3)-Se(9) bond lengths are 2.43 Å. There are three inequivalent In sites. In the first In site, In(1) is bonded to one Se(5), one Se(6), two equivalent Se(8), and two equivalent Se(9) atoms to form InSe6 octahedra that share corners with three equivalent Cu(2)Se4 tetrahedra, corners with three equivalent Cu(3)Se4 tetrahedra,  an edgeedge with one Cr(1)Se6 octahedra,  an edgeedge with one In(3)Se6 octahedra, edges with two equivalent Cr(2)Se6 octahedra, and edges with two equivalent Cr(3)Se6 octahedra. The In(1)-Se(5) bond length is 2.74 Å. The In(1)-Se(6) bond length is 2.75 Å. Both In(1)-Se(8) bond lengths are 2.71 Å. Both In(1)-Se(9) bond lengths are 2.74 Å. In the second In site, In(2) is bonded to two equivalent Se(4) and four equivalent Se(7) atoms to form InSe6 octahedra that share corners with six equivalent Cu(1)Se4 tetrahedra, edges with two equivalent Cr(1)Se6 octahedra, and edges with four equivalent Cr(3)Se6 octahedra. Both In(2)-Se(4) bond lengths are 2.75 Å. All In(2)-Se(7) bond lengths are 2.74 Å. In the third In site, In(3) is bonded to two equivalent Se(2) and four equivalent Se(8) atoms to form InSe6 octahedra that share corners with two equivalent Cu(3)Se4 tetrahedra, corners with four equivalent Cu(2)Se4 tetrahedra, edges with two equivalent In(1)Se6 octahedra, and edges with four equivalent Cr(2)Se6 octahedra. Both In(3)-Se(2) bond lengths are 2.75 Å. All In(3)-Se(8) bond lengths are 2.72 Å. There are nine inequivalent Se sites. In the first Se site, Se(1) is bonded in a distorted rectangular see-saw-like geometry to one Cr(1), two equivalent Cr(3), and one Cu(2) atom. In the second Se site, Se(2) is bonded in a rectangular see-saw-like geometry to two equivalent Cr(2), one Cu(3), and one In(3) atom. In the third Se site, Se(3) is bonded in a distorted rectangular see-saw-like geometry to one Cr(1), two equivalent Cr(3), and one Cu(1) atom. In the fourth Se site, Se(4) is bonded in a rectangular see-saw-like geometry to two equivalent Cr(3), one Cu(1), and one In(2) atom. In the fifth Se site, Se(5) is bonded in a rectangular see-saw-like geometry to two equivalent Cr(2), one Cu(2), and one In(1) atom. In the sixth Se site, Se(6) is bonded in a rectangular see-saw-like geometry to two equivalent Cr(3), one Cu(3), and one In(1) atom. In the seventh Se site, Se(7) is bonded in a rectangular see-saw-like geometry to one Cr(1), one Cr(3), one Cu(1), and one In(2) atom. In the eighth Se site, Se(8) is bonded in a rectangular see-saw-like geometry to one Cr(2), one Cu(2), one In(1), and one In(3) atom. In the ninth Se site, Se(9) is bonded in a rectangular see-saw-like geometry to one Cr(1), one Cr(3), one Cu(3), and one In(1) atom.