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DyS2 is Cubic Laves structured and crystallizes in the cubic Fd-3m space group. The structure is three-dimensional. Dy3+ is bonded in a 12-coordinate geometry to twelve equivalent S+1.50- atoms. All Dy–S bond lengths are 3.23 Å. S+1.50- is bonded to six equivalent Dy3+ and six equivalent S+1.50- atoms to form a mixture of edge, face, and corner-sharing SDy6S6 cuboctahedra. All S–S bond lengths are 2.76 Å.
Ca(DyS2)2 crystallizes in the tetragonal I-42d space group. The structure is three-dimensional. Ca2+ is bonded in a 8-coordinate geometry to eight equivalent S2- atoms. There are four shorter (2.81 Å) and four longer (3.05 Å) Ca–S bond lengths. Dy3+ is bonded to eight equivalent S2- atoms to form a mixture of distorted edge, face, and corner-sharing DyS8 hexagonal bipyramids. There are a spread of Dy–S bond distances ranging from 2.75–3.01 Å. S2- is bonded in a 6-coordinate geometry to two equivalent Ca2+ and four equivalent Dy3+ atoms.
DyS2 crystallizes in the tetragonal P4/nmm space group. The structure is three-dimensional. Dy3+ is bonded in a 9-coordinate geometry to nine S+1.50- atoms. There are a spread of Dy–S bond distances ranging from 2.83–2.92 Å. There are two inequivalent S+1.50- sites. In the first S+1.50- site, S+1.50- is bonded to five equivalent Dy3+ atoms to form a mixture of distorted edge and corner-sharing SDy5 trigonal bipyramids. In the second S+1.50- site, S+1.50- is bonded in a 8-coordinate geometry to four equivalent Dy3+ and four equivalent S+1.50- atoms. All S–S bond lengths are 2.73 Å.
Eu(DyS2)2 crystallizes in the orthorhombic Pnma space group. The structure is three-dimensional. there are two inequivalent Dy3+ sites. In the first Dy3+ site, Dy3+ is bonded to six S2- atoms to form a mixture of corner and edge-sharing DyS6 octahedra. The corner-sharing octahedra tilt angles range from 48–66°. There are a spread of Dy–S bond distances ranging from 2.71–2.76 Å. In the second Dy3+ site, Dy3+ is bonded to six S2- atoms to form a mixture of corner and edge-sharing DyS6 octahedra. The corner-sharing octahedra tilt angles range from 48–66°. There are a spread of Dy–S bond distances ranging from 2.68–2.78 Å. Eu2+ is bonded in a 8-coordinate geometry to eight S2- atoms. There are a spread of Eu–S bond distances ranging from 3.04–3.30 Å. There are four inequivalent S2- sites. In the first S2- site, S2- is bonded in a 5-coordinate geometry to three Dy3+ and two equivalent Eu2+ atoms. In the second S2- site, S2- is bonded to three equivalent Dy3+ and two equivalent Eu2+ atoms to form a mixture of distorted corner and edge-sharing SEu2Dy3 square pyramids. In the third S2- site, S2- is bonded in a 5-coordinate geometry to three Dy3+ and two equivalent Eu2+ atoms. In the fourth S2- site, S2- is bonded to three equivalent Dy3+ and two equivalent Eu2+ atoms to form a mixture of distorted corner and edge-sharing SEu2Dy3 trigonal bipyramids.