Sm2Ta3(SO4)2 crystallizes in the orthorhombic P2_12_12 space group. Sm(1) is bonded in a 9-coordinate geometry to two equivalent S(1), one O(4), two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms. There are two inequivalent Ta sites. In the first Ta site, Ta(1) is bonded in a 6-coordinate geometry to one O(1), one O(3), two equivalent O(2), and two equivalent O(4) atoms. In the second Ta site, Ta(2) is bonded to four equivalent S(1) and two equivalent O(1) atoms to form distorted edge-sharing TaS4O2 octahedra. S(1) is bonded in a distorted rectangular see-saw-like geometry to two equivalent Sm(1) and two equivalent Ta(2) atoms. There are four inequivalent O sites. In the first O site, O(1) is bonded in a distorted rectangular see-saw-like geometry to two equivalent Sm(1), one Ta(1), and one Ta(2) atom. In the second O site, O(2) is bonded to two equivalent Sm(1) and two equivalent Ta(1) atoms to form a mixture of distorted corner and edge-sharing OSm2Ta2 trigonal pyramids. In the third O site, O(3) is bonded in a distorted trigonal planar geometry to two equivalent Sm(1) and one Ta(1) atom. In the fourth O site, O(4) is bonded in a 3-coordinate geometry to one Sm(1) and two equivalent Ta(1) atoms.
Sm2Ta3(SO4)2 crystallizes in the orthorhombic P2_12_12 space group. Sm(1) is bonded in a 9-coordinate geometry to two equivalent S(1), one O(4), two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms. There is one shorter (2.97 Å) and one longer (3.04 Å) Sm(1)-S(1) bond length. The Sm(1)-O(4) bond length is 2.48 Å. There is one shorter (2.56 Å) and one longer (2.58 Å) Sm(1)-O(1) bond length. There is one shorter (2.53 Å) and one longer (2.54 Å) Sm(1)-O(2) bond length. Both Sm(1)-O(3) bond lengths are 2.42 Å. There are two inequivalent Ta sites. In the first Ta site, Ta(1) is bonded in a 6-coordinate geometry to one O(1), one O(3), two equivalent O(2), and two equivalent O(4) atoms. The Ta(1)-O(1) bond length is 2.10 Å. The Ta(1)-O(3) bond length is 1.86 Å. There is one shorter (1.93 Å) and one longer (2.36 Å) Ta(1)-O(2) bond length. There is one shorter (1.94 Å) and one longer (1.95 Å) Ta(1)-O(4) bond length. In the second Ta site, Ta(2) is bonded to four equivalent S(1) and two equivalent O(1) atoms to form distorted edge-sharing TaS4O2 octahedra. There are two shorter (2.56 Å) and two longer (2.58 Å) Ta(2)-S(1) bond lengths. Both Ta(2)-O(1) bond lengths are 1.98 Å. S(1) is bonded in a distorted rectangular see-saw-like geometry to two equivalent Sm(1) and two equivalent Ta(2) atoms. There are four inequivalent O sites. In the first O site, O(1) is bonded in a distorted rectangular see-saw-like geometry to two equivalent Sm(1), one Ta(1), and one Ta(2) atom. In the second O site, O(2) is bonded to two equivalent Sm(1) and two equivalent Ta(1) atoms to form a mixture of distorted corner and edge-sharing OSm2Ta2 trigonal pyramids. In the third O site, O(3) is bonded in a distorted trigonal planar geometry to two equivalent Sm(1) and one Ta(1) atom. In the fourth O site, O(4) is bonded in a 3-coordinate geometry to one Sm(1) and two equivalent Ta(1) atoms.