SrCu2GeSe4 crystallizes in the orthorhombic Ama2 space group. Sr(1) is bonded in a 8-coordinate geometry to two equivalent Se(1), two equivalent Se(3), and four equivalent Se(2) atoms. Cu(1) is bonded in a 4-coordinate geometry to one Se(1), one Se(3), and two equivalent Se(2) atoms. Ge(1) is bonded in a tetrahedral geometry to one Se(1), one Se(3), and two equivalent Se(2) atoms. There are three inequivalent Se sites. In the first Se site, Se(1) is bonded to two equivalent Sr(1), two equivalent Cu(1), and one Ge(1) atom to form distorted corner-sharing SeSr2Cu2Ge trigonal bipyramids. In the second Se site, Se(2) is bonded in a 5-coordinate geometry to two equivalent Sr(1), two equivalent Cu(1), and one Ge(1) atom. In the third Se site, Se(3) is bonded in a 5-coordinate geometry to two equivalent Sr(1), two equivalent Cu(1), and one Ge(1) atom.
SrCu2GeSe4 crystallizes in the orthorhombic Ama2 space group. Sr(1) is bonded in a 8-coordinate geometry to two equivalent Se(1), two equivalent Se(3), and four equivalent Se(2) atoms. Both Sr(1)-Se(1) bond lengths are 3.19 Å. Both Sr(1)-Se(3) bond lengths are 3.36 Å. There are two shorter (3.23 Å) and two longer (3.34 Å) Sr(1)-Se(2) bond lengths. Cu(1) is bonded in a 4-coordinate geometry to one Se(1), one Se(3), and two equivalent Se(2) atoms. The Cu(1)-Se(1) bond length is 2.48 Å. The Cu(1)-Se(3) bond length is 2.49 Å. There is one shorter (2.43 Å) and one longer (2.47 Å) Cu(1)-Se(2) bond length. Ge(1) is bonded in a tetrahedral geometry to one Se(1), one Se(3), and two equivalent Se(2) atoms. The Ge(1)-Se(1) bond length is 2.42 Å. The Ge(1)-Se(3) bond length is 2.41 Å. Both Ge(1)-Se(2) bond lengths are 2.43 Å. There are three inequivalent Se sites. In the first Se site, Se(1) is bonded to two equivalent Sr(1), two equivalent Cu(1), and one Ge(1) atom to form distorted corner-sharing SeSr2Cu2Ge trigonal bipyramids. In the second Se site, Se(2) is bonded in a 5-coordinate geometry to two equivalent Sr(1), two equivalent Cu(1), and one Ge(1) atom. In the third Se site, Se(3) is bonded in a 5-coordinate geometry to two equivalent Sr(1), two equivalent Cu(1), and one Ge(1) atom.