Pr3CuSnSe7 crystallizes in the hexagonal P6_3 space group. Pr(1) is bonded in a 9-coordinate geometry to one Cu(1), one Se(2), three equivalent Se(1), and four equivalent Se(3) atoms. Cu(1) is bonded in a trigonal planar geometry to three equivalent Pr(1) and three equivalent Se(3) atoms. Sn(1) is bonded in a tetrahedral geometry to one Se(2) and three equivalent Se(1) atoms. There are three inequivalent Se sites. In the first Se site, Se(1) is bonded in a distorted rectangular see-saw-like geometry to three equivalent Pr(1) and one Sn(1) atom. In the second Se site, Se(2) is bonded in a tetrahedral geometry to three equivalent Pr(1) and one Sn(1) atom. In the third Se site, Se(3) is bonded in a 5-coordinate geometry to four equivalent Pr(1) and one Cu(1) atom.
Pr3CuSnSe7 crystallizes in the hexagonal P6_3 space group. Pr(1) is bonded in a 9-coordinate geometry to one Cu(1), one Se(2), three equivalent Se(1), and four equivalent Se(3) atoms. The Pr(1)-Cu(1) bond length is 3.34 Å. The Pr(1)-Se(2) bond length is 3.14 Å. There are a spread of Pr(1)-Se(1) bond distances ranging from 3.08-3.25 Å. There are a spread of Pr(1)-Se(3) bond distances ranging from 2.96-3.51 Å. Cu(1) is bonded in a trigonal planar geometry to three equivalent Pr(1) and three equivalent Se(3) atoms. All Cu(1)-Se(3) bond lengths are 2.40 Å. Sn(1) is bonded in a tetrahedral geometry to one Se(2) and three equivalent Se(1) atoms. The Sn(1)-Se(2) bond length is 2.52 Å. All Sn(1)-Se(1) bond lengths are 2.57 Å. There are three inequivalent Se sites. In the first Se site, Se(1) is bonded in a distorted rectangular see-saw-like geometry to three equivalent Pr(1) and one Sn(1) atom. In the second Se site, Se(2) is bonded in a tetrahedral geometry to three equivalent Pr(1) and one Sn(1) atom. In the third Se site, Se(3) is bonded in a 5-coordinate geometry to four equivalent Pr(1) and one Cu(1) atom.