TmCu(WO4)2 crystallizes in the monoclinic P2/c space group. Tm(1) is bonded to two equivalent O(1), two equivalent O(3), and two equivalent O(4) atoms to form TmO6 octahedra that share corners with eight equivalent W(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 47-57°. W(1) is bonded to one O(1), one O(3), two equivalent O(2), and two equivalent O(4) atoms to form distorted WO6 octahedra that share corners with four equivalent Tm(1)O6 octahedra and edges with two equivalent W(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 47-57°. Cu(1) is bonded in a 6-coordinate geometry to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms. There are four inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal planar geometry to one Tm(1), one W(1), and one Cu(1) atom. In the second O site, O(2) is bonded in a distorted trigonal planar geometry to two equivalent W(1) and one Cu(1) atom. In the third O site, O(3) is bonded in a 3-coordinate geometry to one Tm(1), one W(1), and one Cu(1) atom. In the fourth O site, O(4) is bonded in a trigonal planar geometry to one Tm(1) and two equivalent W(1) atoms.
TmCu(WO4)2 crystallizes in the monoclinic P2/c space group. Tm(1) is bonded to two equivalent O(1), two equivalent O(3), and two equivalent O(4) atoms to form TmO6 octahedra that share corners with eight equivalent W(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 47-57°. Both Tm(1)-O(1) bond lengths are 2.29 Å. Both Tm(1)-O(3) bond lengths are 2.20 Å. Both Tm(1)-O(4) bond lengths are 2.24 Å. W(1) is bonded to one O(1), one O(3), two equivalent O(2), and two equivalent O(4) atoms to form distorted WO6 octahedra that share corners with four equivalent Tm(1)O6 octahedra and edges with two equivalent W(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 47-57°. The W(1)-O(1) bond length is 1.85 Å. The W(1)-O(3) bond length is 1.83 Å. There is one shorter (1.92 Å) and one longer (2.18 Å) W(1)-O(2) bond length. There is one shorter (2.00 Å) and one longer (2.11 Å) W(1)-O(4) bond length. Cu(1) is bonded in a 6-coordinate geometry to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms. Both Cu(1)-O(1) bond lengths are 2.10 Å. Both Cu(1)-O(2) bond lengths are 2.10 Å. Both Cu(1)-O(3) bond lengths are 2.61 Å. There are four inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal planar geometry to one Tm(1), one W(1), and one Cu(1) atom. In the second O site, O(2) is bonded in a distorted trigonal planar geometry to two equivalent W(1) and one Cu(1) atom. In the third O site, O(3) is bonded in a 3-coordinate geometry to one Tm(1), one W(1), and one Cu(1) atom. In the fourth O site, O(4) is bonded in a trigonal planar geometry to one Tm(1) and two equivalent W(1) atoms.