FeCu4Cd(SnSe4)2 is Clathrate-derived structured and crystallizes in the tetragonal P-42m space group. Fe(1) is bonded to four equivalent Se(2) atoms to form FeSe4 tetrahedra that share corners with four equivalent Sn(2)Se4 tetrahedra and corners with eight equivalent Cu(1)Se4 tetrahedra. Cu(1) is bonded to two equivalent Se(1) and two equivalent Se(2) atoms to form CuSe4 tetrahedra that share corners with two equivalent Fe(1)Se4 tetrahedra, corners with two equivalent Cd(1)Se4 tetrahedra, corners with two equivalent Sn(1)Se4 tetrahedra, corners with two equivalent Sn(2)Se4 tetrahedra, and corners with four equivalent Cu(1)Se4 tetrahedra. Cd(1) is bonded to four equivalent Se(1) atoms to form CdSe4 tetrahedra that share corners with four equivalent Sn(1)Se4 tetrahedra and corners with eight equivalent Cu(1)Se4 tetrahedra. There are two inequivalent Sn sites. In the first Sn site, Sn(1) is bonded to four equivalent Se(1) atoms to form SnSe4 tetrahedra that share corners with four equivalent Cd(1)Se4 tetrahedra and corners with eight equivalent Cu(1)Se4 tetrahedra. In the second Sn site, Sn(2) is bonded to four equivalent Se(2) atoms to form SnSe4 tetrahedra that share corners with four equivalent Fe(1)Se4 tetrahedra and corners with eight equivalent Cu(1)Se4 tetrahedra. There are two inequivalent Se sites. In the first Se site, Se(1) is bonded to two equivalent Cu(1), one Cd(1), and one Sn(1) atom to form SeCdCu2Sn tetrahedra that share corners with four equivalent Se(2)FeCu2Sn tetrahedra and corners with eight equivalent Se(1)CdCu2Sn tetrahedra. In the second Se site, Se(2) is bonded to one Fe(1), two equivalent Cu(1), and one Sn(2) atom to form SeFeCu2Sn tetrahedra that share corners with four equivalent Se(1)CdCu2Sn tetrahedra and corners with eight equivalent Se(2)FeCu2Sn tetrahedra.
FeCu4Cd(SnSe4)2 is Clathrate-derived structured and crystallizes in the tetragonal P-42m space group. Fe(1) is bonded to four equivalent Se(2) atoms to form FeSe4 tetrahedra that share corners with four equivalent Sn(2)Se4 tetrahedra and corners with eight equivalent Cu(1)Se4 tetrahedra. All Fe(1)-Se(2) bond lengths are 2.45 Å. Cu(1) is bonded to two equivalent Se(1) and two equivalent Se(2) atoms to form CuSe4 tetrahedra that share corners with two equivalent Fe(1)Se4 tetrahedra, corners with two equivalent Cd(1)Se4 tetrahedra, corners with two equivalent Sn(1)Se4 tetrahedra, corners with two equivalent Sn(2)Se4 tetrahedra, and corners with four equivalent Cu(1)Se4 tetrahedra. Both Cu(1)-Se(1) bond lengths are 2.43 Å. Both Cu(1)-Se(2) bond lengths are 2.45 Å. Cd(1) is bonded to four equivalent Se(1) atoms to form CdSe4 tetrahedra that share corners with four equivalent Sn(1)Se4 tetrahedra and corners with eight equivalent Cu(1)Se4 tetrahedra. All Cd(1)-Se(1) bond lengths are 2.66 Å. There are two inequivalent Sn sites. In the first Sn site, Sn(1) is bonded to four equivalent Se(1) atoms to form SnSe4 tetrahedra that share corners with four equivalent Cd(1)Se4 tetrahedra and corners with eight equivalent Cu(1)Se4 tetrahedra. All Sn(1)-Se(1) bond lengths are 2.62 Å. In the second Sn site, Sn(2) is bonded to four equivalent Se(2) atoms to form SnSe4 tetrahedra that share corners with four equivalent Fe(1)Se4 tetrahedra and corners with eight equivalent Cu(1)Se4 tetrahedra. All Sn(2)-Se(2) bond lengths are 2.66 Å. There are two inequivalent Se sites. In the first Se site, Se(1) is bonded to two equivalent Cu(1), one Cd(1), and one Sn(1) atom to form SeCdCu2Sn tetrahedra that share corners with four equivalent Se(2)FeCu2Sn tetrahedra and corners with eight equivalent Se(1)CdCu2Sn tetrahedra. In the second Se site, Se(2) is bonded to one Fe(1), two equivalent Cu(1), and one Sn(2) atom to form SeFeCu2Sn tetrahedra that share corners with four equivalent Se(1)CdCu2Sn tetrahedra and corners with eight equivalent Se(2)FeCu2Sn tetrahedra.