PrTl(WO4)2 crystallizes in the monoclinic C2/m space group. Pr(1) is bonded in a 4-coordinate geometry to one O(4), one O(5), and two equivalent O(3) atoms. There are two inequivalent W sites. In the first W site, W(1) is bonded to one O(4), one O(5), two equivalent O(1), and two equivalent O(3) atoms to form distorted WO6 octahedra that share corners with four equivalent Tl(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 43-69°. In the second W site, W(2) is bonded in a 6-coordinate geometry to two equivalent O(1), two equivalent O(2), and two equivalent O(4) atoms. Tl(1) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms to form distorted TlO6 octahedra that share corners with four equivalent W(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 43-69°. There are five inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal planar geometry to one W(1), one W(2), and one Tl(1) atom. In the second O site, O(2) is bonded in a distorted single-bond geometry to one W(2) and one Tl(1) atom. In the third O site, O(3) is bonded in a 3-coordinate geometry to one Pr(1), one W(1), and one Tl(1) atom. In the fourth O site, O(4) is bonded to one Pr(1), one W(1), and two equivalent W(2) atoms to form distorted edge-sharing OPrW3 tetrahedra. In the fifth O site, O(5) is bonded in a bent 150 degrees geometry to one Pr(1) and one W(1) atom.
PrTl(WO4)2 crystallizes in the monoclinic C2/m space group. Pr(1) is bonded in a 4-coordinate geometry to one O(4), one O(5), and two equivalent O(3) atoms. The Pr(1)-O(4) bond length is 2.32 Å. The Pr(1)-O(5) bond length is 2.37 Å. Both Pr(1)-O(3) bond lengths are 2.33 Å. There are two inequivalent W sites. In the first W site, W(1) is bonded to one O(4), one O(5), two equivalent O(1), and two equivalent O(3) atoms to form distorted WO6 octahedra that share corners with four equivalent Tl(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 43-69°. The W(1)-O(4) bond length is 2.34 Å. The W(1)-O(5) bond length is 1.84 Å. Both W(1)-O(1) bond lengths are 2.00 Å. Both W(1)-O(3) bond lengths are 1.88 Å. In the second W site, W(2) is bonded in a 6-coordinate geometry to two equivalent O(1), two equivalent O(2), and two equivalent O(4) atoms. Both W(2)-O(1) bond lengths are 1.94 Å. Both W(2)-O(2) bond lengths are 1.80 Å. Both W(2)-O(4) bond lengths are 2.33 Å. Tl(1) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms to form distorted TlO6 octahedra that share corners with four equivalent W(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 43-69°. Both Tl(1)-O(1) bond lengths are 2.73 Å. Both Tl(1)-O(2) bond lengths are 2.74 Å. Both Tl(1)-O(3) bond lengths are 2.76 Å. There are five inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal planar geometry to one W(1), one W(2), and one Tl(1) atom. In the second O site, O(2) is bonded in a distorted single-bond geometry to one W(2) and one Tl(1) atom. In the third O site, O(3) is bonded in a 3-coordinate geometry to one Pr(1), one W(1), and one Tl(1) atom. In the fourth O site, O(4) is bonded to one Pr(1), one W(1), and two equivalent W(2) atoms to form distorted edge-sharing OPrW3 tetrahedra. In the fifth O site, O(5) is bonded in a bent 150 degrees geometry to one Pr(1) and one W(1) atom.