EuCu2SnS4 crystallizes in the orthorhombic Ama2 space group. Eu(1) is bonded in a 8-coordinate geometry to two equivalent S(2), two equivalent S(3), and four equivalent S(1) atoms. Cu(1) is bonded in a 4-coordinate geometry to one S(2), one S(3), and two equivalent S(1) atoms. Sn(1) is bonded in a tetrahedral geometry to one S(2), one S(3), and two equivalent S(1) atoms. There are three inequivalent S sites. In the first S site, S(1) is bonded in a 5-coordinate geometry to two equivalent Eu(1), two equivalent Cu(1), and one Sn(1) atom. In the second S site, S(2) is bonded in a 5-coordinate geometry to two equivalent Eu(1), two equivalent Cu(1), and one Sn(1) atom. In the third S site, S(3) is bonded in a 5-coordinate geometry to two equivalent Eu(1), two equivalent Cu(1), and one Sn(1) atom.
EuCu2SnS4 crystallizes in the orthorhombic Ama2 space group. Eu(1) is bonded in a 8-coordinate geometry to two equivalent S(2), two equivalent S(3), and four equivalent S(1) atoms. Both Eu(1)-S(2) bond lengths are 3.13 Å. Both Eu(1)-S(3) bond lengths are 3.12 Å. There are two shorter (3.04 Å) and two longer (3.21 Å) Eu(1)-S(1) bond lengths. Cu(1) is bonded in a 4-coordinate geometry to one S(2), one S(3), and two equivalent S(1) atoms. The Cu(1)-S(2) bond length is 2.44 Å. The Cu(1)-S(3) bond length is 2.34 Å. There is one shorter (2.30 Å) and one longer (2.33 Å) Cu(1)-S(1) bond length. Sn(1) is bonded in a tetrahedral geometry to one S(2), one S(3), and two equivalent S(1) atoms. The Sn(1)-S(2) bond length is 2.45 Å. The Sn(1)-S(3) bond length is 2.46 Å. Both Sn(1)-S(1) bond lengths are 2.46 Å. There are three inequivalent S sites. In the first S site, S(1) is bonded in a 5-coordinate geometry to two equivalent Eu(1), two equivalent Cu(1), and one Sn(1) atom. In the second S site, S(2) is bonded in a 5-coordinate geometry to two equivalent Eu(1), two equivalent Cu(1), and one Sn(1) atom. In the third S site, S(3) is bonded in a 5-coordinate geometry to two equivalent Eu(1), two equivalent Cu(1), and one Sn(1) atom.