La3CuGeSe7 crystallizes in the hexagonal P6_3 space group. La(1) is bonded in a 8-coordinate geometry to 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 Se(2) atoms. Ge(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 La(1) and one Ge(1) atom. In the second Se site, Se(2) is bonded in a 5-coordinate geometry to four equivalent La(1) and one Cu(1) atom. In the third Se site, Se(3) is bonded in a distorted rectangular see-saw-like geometry to three equivalent La(1) and one Ge(1) atom.
La3CuGeSe7 crystallizes in the hexagonal P6_3 space group. La(1) is bonded in a 8-coordinate geometry to one Se(1), three equivalent Se(3), and four equivalent Se(2) atoms. The La(1)-Se(1) bond length is 3.22 Å. There are a spread of La(1)-Se(3) bond distances ranging from 3.07-3.24 Å. There are a spread of La(1)-Se(2) bond distances ranging from 3.00-3.34 Å. Cu(1) is bonded in a trigonal planar geometry to three equivalent Se(2) atoms. All Cu(1)-Se(2) bond lengths are 2.40 Å. Ge(1) is bonded in a tetrahedral geometry to one Se(1) and three equivalent Se(3) atoms. The Ge(1)-Se(1) bond length is 2.36 Å. All Ge(1)-Se(3) bond lengths are 2.40 Å. There are three inequivalent Se sites. In the first Se site, Se(1) is bonded in a tetrahedral geometry to three equivalent La(1) and one Ge(1) atom. In the second Se site, Se(2) is bonded in a 5-coordinate geometry to four equivalent La(1) and one Cu(1) atom. In the third Se site, Se(3) is bonded in a distorted rectangular see-saw-like geometry to three equivalent La(1) and one Ge(1) atom.