Cu2CoSnSe4 is Stannite structured and crystallizes in the tetragonal I-42m space group. Co(1) is bonded to four equivalent Se(1) atoms to form CoSe4 tetrahedra that share corners with four equivalent Sn(1)Se4 tetrahedra and corners with eight equivalent Cu(1)Se4 tetrahedra. Cu(1) is bonded to four equivalent Se(1) atoms to form CuSe4 tetrahedra that share corners with four equivalent Co(1)Se4 tetrahedra, corners with four equivalent Cu(1)Se4 tetrahedra, and corners with four equivalent Sn(1)Se4 tetrahedra. Sn(1) is bonded to four equivalent Se(1) atoms to form SnSe4 tetrahedra that share corners with four equivalent Co(1)Se4 tetrahedra and corners with eight equivalent Cu(1)Se4 tetrahedra. Se(1) is bonded to one Co(1), two equivalent Cu(1), and one Sn(1) atom to form corner-sharing SeCoCu2Sn tetrahedra.
Cu2CoSnSe4 is Stannite structured and crystallizes in the tetragonal I-42m space group. Co(1) is bonded to four equivalent Se(1) atoms to form CoSe4 tetrahedra that share corners with four equivalent Sn(1)Se4 tetrahedra and corners with eight equivalent Cu(1)Se4 tetrahedra. All Co(1)-Se(1) bond lengths are 2.37 Å. Cu(1) is bonded to four equivalent Se(1) atoms to form CuSe4 tetrahedra that share corners with four equivalent Co(1)Se4 tetrahedra, corners with four equivalent Cu(1)Se4 tetrahedra, and corners with four equivalent Sn(1)Se4 tetrahedra. All Cu(1)-Se(1) bond lengths are 2.42 Å. Sn(1) is bonded to four equivalent Se(1) atoms to form SnSe4 tetrahedra that share corners with four equivalent Co(1)Se4 tetrahedra and corners with eight equivalent Cu(1)Se4 tetrahedra. All Sn(1)-Se(1) bond lengths are 2.65 Å. Se(1) is bonded to one Co(1), two equivalent Cu(1), and one Sn(1) atom to form corner-sharing SeCoCu2Sn tetrahedra.