CrCuSnSe4 is Spinel-derived structured and crystallizes in the orthorhombic Imma space group. Cr(1) is bonded to two equivalent Se(1) and four equivalent Se(2) atoms to form CrSe6 octahedra that share corners with six equivalent Cu(1)Se4 tetrahedra, edges with two equivalent Cr(1)Se6 octahedra, and edges with four equivalent Sn(1)Se6 octahedra. Cu(1) is bonded to two equivalent Se(1) and two equivalent Se(2) atoms to form CuSe4 tetrahedra that share corners with six equivalent Cr(1)Se6 octahedra and corners with six equivalent Sn(1)Se6 octahedra. The corner-sharing octahedral tilt angles range from 50-63°. Sn(1) is bonded to two equivalent Se(2) and four equivalent Se(1) atoms to form SnSe6 octahedra that share corners with six equivalent Cu(1)Se4 tetrahedra, edges with two equivalent Sn(1)Se6 octahedra, and edges with four equivalent Cr(1)Se6 octahedra. There are two inequivalent Se sites. In the first Se site, Se(1) is bonded in a rectangular see-saw-like geometry to one Cr(1), one Cu(1), and two equivalent Sn(1) atoms. In the second Se site, Se(2) is bonded in a rectangular see-saw-like geometry to two equivalent Cr(1), one Cu(1), and one Sn(1) atom.
CrCuSnSe4 is Spinel-derived structured and crystallizes in the orthorhombic Imma space group. Cr(1) is bonded to two equivalent Se(1) and four equivalent Se(2) atoms to form CrSe6 octahedra that share corners with six equivalent Cu(1)Se4 tetrahedra, edges with two equivalent Cr(1)Se6 octahedra, and edges with four equivalent Sn(1)Se6 octahedra. Both Cr(1)-Se(1) bond lengths are 2.54 Å. All Cr(1)-Se(2) bond lengths are 2.58 Å. Cu(1) is bonded to two equivalent Se(1) and two equivalent Se(2) atoms to form CuSe4 tetrahedra that share corners with six equivalent Cr(1)Se6 octahedra and corners with six equivalent Sn(1)Se6 octahedra. The corner-sharing octahedral tilt angles range from 50-63°. Both Cu(1)-Se(1) bond lengths are 2.43 Å. Both Cu(1)-Se(2) bond lengths are 2.47 Å. Sn(1) is bonded to two equivalent Se(2) and four equivalent Se(1) atoms to form SnSe6 octahedra that share corners with six equivalent Cu(1)Se4 tetrahedra, edges with two equivalent Sn(1)Se6 octahedra, and edges with four equivalent Cr(1)Se6 octahedra. Both Sn(1)-Se(2) bond lengths are 2.72 Å. All Sn(1)-Se(1) bond lengths are 2.73 Å. There are two inequivalent Se sites. In the first Se site, Se(1) is bonded in a rectangular see-saw-like geometry to one Cr(1), one Cu(1), and two equivalent Sn(1) atoms. In the second Se site, Se(2) is bonded in a rectangular see-saw-like geometry to two equivalent Cr(1), one Cu(1), and one Sn(1) atom.