Eu3(AsS4)2 crystallizes in the trigonal R-3c space group. Eu(1) is bonded in a 8-coordinate geometry to two equivalent S(2) and six equivalent S(1) atoms. As(1) is bonded in a tetrahedral geometry to one S(2) and three equivalent S(1) atoms. There are two inequivalent S sites. In the first S site, S(2) is bonded to three equivalent Eu(1) and one As(1) atom to form a mixture of corner and edge-sharing SEu3As trigonal pyramids. In the second S site, S(1) is bonded to three equivalent Eu(1) and one As(1) atom to form a mixture of distorted corner and edge-sharing SEu3As trigonal pyramids.
Eu3(AsS4)2 crystallizes in the trigonal R-3c space group. Eu(1) is bonded in a 8-coordinate geometry to two equivalent S(2) and six equivalent S(1) atoms. Both Eu(1)-S(2) bond lengths are 3.13 Å. There are a spread of Eu(1)-S(1) bond distances ranging from 2.93-3.41 Å. As(1) is bonded in a tetrahedral geometry to one S(2) and three equivalent S(1) atoms. The As(1)-S(2) bond length is 2.20 Å. All As(1)-S(1) bond lengths are 2.18 Å. There are two inequivalent S sites. In the first S site, S(2) is bonded to three equivalent Eu(1) and one As(1) atom to form a mixture of corner and edge-sharing SEu3As trigonal pyramids. In the second S site, S(1) is bonded to three equivalent Eu(1) and one As(1) atom to form a mixture of distorted corner and edge-sharing SEu3As trigonal pyramids.