CuGePSe is Stannite-like structured and crystallizes in the trigonal R3m space group. Cu(1) is bonded to one P(1) and three equivalent Se(1) atoms to form CuPSe3 tetrahedra that share corners with six equivalent Cu(1)PSe3 tetrahedra and corners with six equivalent Ge(1)P3Se tetrahedra. Ge(1) is bonded to three equivalent P(1) and one Se(1) atom to form GeP3Se tetrahedra that share corners with six equivalent Cu(1)PSe3 tetrahedra and corners with six equivalent Ge(1)P3Se tetrahedra. P(1) is bonded to one Cu(1) and three equivalent Ge(1) atoms to form PCuGe3 tetrahedra that share corners with six equivalent P(1)CuGe3 tetrahedra and corners with six equivalent Se(1)Cu3Ge tetrahedra. Se(1) is bonded to three equivalent Cu(1) and one Ge(1) atom to form SeCu3Ge tetrahedra that share corners with six equivalent P(1)CuGe3 tetrahedra and corners with six equivalent Se(1)Cu3Ge tetrahedra.
CuGePSe is Stannite-like structured and crystallizes in the trigonal R3m space group. Cu(1) is bonded to one P(1) and three equivalent Se(1) atoms to form CuPSe3 tetrahedra that share corners with six equivalent Cu(1)PSe3 tetrahedra and corners with six equivalent Ge(1)P3Se tetrahedra. The Cu(1)-P(1) bond length is 2.24 Å. All Cu(1)-Se(1) bond lengths are 2.39 Å. Ge(1) is bonded to three equivalent P(1) and one Se(1) atom to form GeP3Se tetrahedra that share corners with six equivalent Cu(1)PSe3 tetrahedra and corners with six equivalent Ge(1)P3Se tetrahedra. All Ge(1)-P(1) bond lengths are 2.45 Å. The Ge(1)-Se(1) bond length is 2.39 Å. P(1) is bonded to one Cu(1) and three equivalent Ge(1) atoms to form PCuGe3 tetrahedra that share corners with six equivalent P(1)CuGe3 tetrahedra and corners with six equivalent Se(1)Cu3Ge tetrahedra. Se(1) is bonded to three equivalent Cu(1) and one Ge(1) atom to form SeCu3Ge tetrahedra that share corners with six equivalent P(1)CuGe3 tetrahedra and corners with six equivalent Se(1)Cu3Ge tetrahedra.