YCu(WO4)2 crystallizes in the monoclinic P2/c space group. Y(1) is bonded to two equivalent O(1), two equivalent O(3), and two equivalent O(4) atoms to form YO6 octahedra that share corners with eight equivalent W(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 48-57°. 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 Y(1)O6 octahedra and edges with two equivalent W(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 48-57°. Cu(1) is bonded in a distorted see-saw-like geometry to two equivalent O(1) and two equivalent O(2) atoms. There are four inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal planar geometry to one Y(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 distorted bent 120 degrees geometry to one Y(1) and one W(1) atom. In the fourth O site, O(4) is bonded in a trigonal planar geometry to one Y(1) and two equivalent W(1) atoms.
YCu(WO4)2 crystallizes in the monoclinic P2/c space group. Y(1) is bonded to two equivalent O(1), two equivalent O(3), and two equivalent O(4) atoms to form YO6 octahedra that share corners with eight equivalent W(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 48-57°. Both Y(1)-O(1) bond lengths are 2.36 Å. Both Y(1)-O(3) bond lengths are 2.24 Å. Both Y(1)-O(4) bond lengths are 2.30 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 Y(1)O6 octahedra and edges with two equivalent W(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 48-57°. 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 (1.91 Å) and one longer (2.20 Å) W(1)-O(2) bond length. There is one shorter (2.00 Å) and one longer (2.10 Å) W(1)-O(4) bond length. Cu(1) is bonded in a distorted see-saw-like geometry to two equivalent O(1) and two equivalent O(2) atoms. Both Cu(1)-O(1) bond lengths are 2.09 Å. Both Cu(1)-O(2) bond lengths are 2.10 Å. There are four inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal planar geometry to one Y(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 distorted bent 120 degrees geometry to one Y(1) and one W(1) atom. In the fourth O site, O(4) is bonded in a trigonal planar geometry to one Y(1) and two equivalent W(1) atoms.