Eu(BS2)2 crystallizes in the monoclinic P2_1/c space group. Eu(1) is bonded in a 9-coordinate geometry to two equivalent S(1), two equivalent S(2), two equivalent S(4), and three equivalent S(3) atoms. There are two inequivalent B sites. In the first B site, B(1) is bonded to one S(1), one S(4), and two equivalent S(2) atoms to form corner-sharing BS4 tetrahedra. In the second B site, B(2) is bonded to one S(1), one S(4), and two equivalent S(3) atoms to form a mixture of edge and corner-sharing BS4 tetrahedra. There are four inequivalent S sites. In the first S site, S(1) is bonded in a 4-coordinate geometry to two equivalent Eu(1), one B(1), and one B(2) atom. In the second S site, S(2) is bonded in a distorted water-like geometry to two equivalent Eu(1) and two equivalent B(1) atoms. In the third S site, S(3) is bonded in a 5-coordinate geometry to three equivalent Eu(1) and two equivalent B(2) atoms. In the fourth S site, S(4) is bonded in a 2-coordinate geometry to two equivalent Eu(1), one B(1), and one B(2) atom.
Eu(BS2)2 crystallizes in the monoclinic P2_1/c space group. Eu(1) is bonded in a 9-coordinate geometry to two equivalent S(1), two equivalent S(2), two equivalent S(4), and three equivalent S(3) atoms. There is one shorter (2.94 Å) and one longer (3.05 Å) Eu(1)-S(1) bond length. There is one shorter (3.05 Å) and one longer (3.07 Å) Eu(1)-S(2) bond length. There is one shorter (3.01 Å) and one longer (3.44 Å) Eu(1)-S(4) bond length. There are a spread of Eu(1)-S(3) bond distances ranging from 3.15-3.52 Å. There are two inequivalent B sites. In the first B site, B(1) is bonded to one S(1), one S(4), and two equivalent S(2) atoms to form corner-sharing BS4 tetrahedra. The B(1)-S(1) bond length is 1.93 Å. The B(1)-S(4) bond length is 1.91 Å. There is one shorter (1.92 Å) and one longer (1.94 Å) B(1)-S(2) bond length. In the second B site, B(2) is bonded to one S(1), one S(4), and two equivalent S(3) atoms to form a mixture of edge and corner-sharing BS4 tetrahedra. The B(2)-S(1) bond length is 1.91 Å. The B(2)-S(4) bond length is 1.88 Å. Both B(2)-S(3) bond lengths are 1.97 Å. There are four inequivalent S sites. In the first S site, S(1) is bonded in a 4-coordinate geometry to two equivalent Eu(1), one B(1), and one B(2) atom. In the second S site, S(2) is bonded in a distorted water-like geometry to two equivalent Eu(1) and two equivalent B(1) atoms. In the third S site, S(3) is bonded in a 5-coordinate geometry to three equivalent Eu(1) and two equivalent B(2) atoms. In the fourth S site, S(4) is bonded in a 2-coordinate geometry to two equivalent Eu(1), one B(1), and one B(2) atom.