Ce3CuSnSe7 crystallizes in the hexagonal P6_3 space group. Ce(1) is bonded in a 9-coordinate geometry to one Cu(1), one Se(1), three equivalent Se(3), and four equivalent Se(2) atoms. Cu(1) is bonded in a trigonal planar geometry to three equivalent Ce(1) and three equivalent Se(2) atoms. Sn(1) is bonded in a tetrahedral geometry to one Se(1) and three equivalent Se(3) atoms. There are three inequivalent Se sites. In the first Se site, Se(1) is bonded in a tetrahedral geometry to three equivalent Ce(1) and one Sn(1) atom. In the second Se site, Se(2) is bonded in a 5-coordinate geometry to four equivalent Ce(1) and one Cu(1) atom. In the third Se site, Se(3) is bonded in a rectangular see-saw-like geometry to three equivalent Ce(1) and one Sn(1) atom.
Ce3CuSnSe7 crystallizes in the hexagonal P6_3 space group. Ce(1) is bonded in a 9-coordinate geometry to one Cu(1), one Se(1), three equivalent Se(3), and four equivalent Se(2) atoms. The Ce(1)-Cu(1) bond length is 3.33 Å. The Ce(1)-Se(1) bond length is 3.08 Å. There are a spread of Ce(1)-Se(3) bond distances ranging from 3.04-3.21 Å. There are a spread of Ce(1)-Se(2) bond distances ranging from 2.95-3.48 Å. Cu(1) is bonded in a trigonal planar geometry to three equivalent Ce(1) and three equivalent Se(2) atoms. All Cu(1)-Se(2) bond lengths are 2.38 Å. Sn(1) is bonded in a tetrahedral geometry to one Se(1) and three equivalent Se(3) atoms. The Sn(1)-Se(1) bond length is 2.57 Å. All Sn(1)-Se(3) bond lengths are 2.60 Å. There are three inequivalent Se sites. In the first Se site, Se(1) is bonded in a tetrahedral geometry to three equivalent Ce(1) and one Sn(1) atom. In the second Se site, Se(2) is bonded in a 5-coordinate geometry to four equivalent Ce(1) and one Cu(1) atom. In the third Se site, Se(3) is bonded in a rectangular see-saw-like geometry to three equivalent Ce(1) and one Sn(1) atom.