Cu2U3Se7 crystallizes in the hexagonal P6_3 space group. U(1) is bonded in a 8-coordinate geometry to one Se(3), three equivalent Se(1), and four equivalent Se(2) atoms. There are two inequivalent Cu sites. In the first Cu site, Cu(1) is bonded in a tetrahedral geometry to one Se(3) and three equivalent Se(1) atoms. In the second Cu site, Cu(2) is bonded in a trigonal planar geometry to three equivalent Se(2) atoms. There are three inequivalent Se sites. In the first Se site, Se(1) is bonded in a 4-coordinate geometry to three equivalent U(1) and one Cu(1) atom. In the second Se site, Se(2) is bonded in a 5-coordinate geometry to four equivalent U(1) and one Cu(2) atom. In the third Se site, Se(3) is bonded in a distorted tetrahedral geometry to three equivalent U(1) and one Cu(1) atom.
Cu2U3Se7 crystallizes in the hexagonal P6_3 space group. U(1) is bonded in a 8-coordinate geometry to one Se(3), three equivalent Se(1), and four equivalent Se(2) atoms. The U(1)-Se(3) bond length is 2.90 Å. There are a spread of U(1)-Se(1) bond distances ranging from 2.79-3.11 Å. There are a spread of U(1)-Se(2) bond distances ranging from 2.94-3.32 Å. There are two inequivalent Cu sites. In the first Cu site, Cu(1) is bonded in a tetrahedral geometry to one Se(3) and three equivalent Se(1) atoms. The Cu(1)-Se(3) bond length is 2.40 Å. All Cu(1)-Se(1) bond lengths are 2.37 Å. In the second Cu site, Cu(2) is bonded in a trigonal planar geometry to three equivalent Se(2) atoms. All Cu(2)-Se(2) bond lengths are 2.32 Å. There are three inequivalent Se sites. In the first Se site, Se(1) is bonded in a 4-coordinate geometry to three equivalent U(1) and one Cu(1) atom. In the second Se site, Se(2) is bonded in a 5-coordinate geometry to four equivalent U(1) and one Cu(2) atom. In the third Se site, Se(3) is bonded in a distorted tetrahedral geometry to three equivalent U(1) and one Cu(1) atom.