MgYCu(WO4)2 crystallizes in the triclinic P1 space group. Mg(1) is bonded in a 6-coordinate geometry to one O(2), one O(3), one O(4), one O(5), one O(7), and one O(8) atom. Y(1) is bonded to one O(1), one O(2), one O(4), one O(5), one O(6), and one O(7) atom to form YO6 octahedra that share corners with four equivalent W(1)O6 octahedra and corners with four equivalent W(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 34-62°. There are two inequivalent W sites. In the first W site, W(1) is bonded to one O(1), one O(2), one O(3), one O(4), one O(7), and one O(8) atom to form distorted WO6 octahedra that share corners with four equivalent Y(1)O6 octahedra and edges with two equivalent W(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 34-62°. In the second W site, W(2) is bonded to one O(3), one O(4), one O(5), one O(6), one O(7), and one O(8) atom 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 34-62°. Cu(1) is bonded in a linear geometry to one O(3) and one O(8) atom. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a distorted bent 150 degrees geometry to one Y(1) and one W(1) atom. In the second O site, O(2) is bonded in a T-shaped geometry to one Mg(1), one Y(1), and one W(1) atom. In the third O site, O(3) is bonded in a 4-coordinate geometry to one Mg(1), one W(1), one W(2), and one Cu(1) atom. In the fourth O site, O(4) is bonded in a 4-coordinate geometry to one Mg(1), one Y(1), one W(1), and one W(2) atom. In the fifth O site, O(5) is bonded in a T-shaped geometry to one Mg(1), one Y(1), and one W(2) atom. In the sixth O site, O(6) is bonded in a distorted bent 150 degrees geometry to one Y(1) and one W(2) atom. In the seventh O site, O(7) is bonded in a 4-coordinate geometry to one Mg(1), one Y(1), one W(1), and one W(2) atom. In the eighth O site, O(8) is bonded in a 4-coordinate geometry to one Mg(1), one W(1), one W(2), and one Cu(1) atom.
MgYCu(WO4)2 crystallizes in the triclinic P1 space group. Mg(1) is bonded in a 6-coordinate geometry to one O(2), one O(3), one O(4), one O(5), one O(7), and one O(8) atom. The Mg(1)-O(2) bond length is 1.98 Å. The Mg(1)-O(3) bond length is 2.29 Å. The Mg(1)-O(4) bond length is 2.19 Å. The Mg(1)-O(5) bond length is 1.98 Å. The Mg(1)-O(7) bond length is 2.20 Å. The Mg(1)-O(8) bond length is 2.29 Å. Y(1) is bonded to one O(1), one O(2), one O(4), one O(5), one O(6), and one O(7) atom to form YO6 octahedra that share corners with four equivalent W(1)O6 octahedra and corners with four equivalent W(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 34-62°. The Y(1)-O(1) bond length is 2.29 Å. The Y(1)-O(2) bond length is 2.26 Å. The Y(1)-O(4) bond length is 2.45 Å. The Y(1)-O(5) bond length is 2.26 Å. The Y(1)-O(6) bond length is 2.29 Å. The Y(1)-O(7) bond length is 2.44 Å. There are two inequivalent W sites. In the first W site, W(1) is bonded to one O(1), one O(2), one O(3), one O(4), one O(7), and one O(8) atom to form distorted WO6 octahedra that share corners with four equivalent Y(1)O6 octahedra and edges with two equivalent W(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 34-62°. The W(1)-O(1) bond length is 1.81 Å. The W(1)-O(2) bond length is 2.00 Å. The W(1)-O(3) bond length is 2.13 Å. The W(1)-O(4) bond length is 2.27 Å. The W(1)-O(7) bond length is 2.09 Å. The W(1)-O(8) bond length is 2.04 Å. In the second W site, W(2) is bonded to one O(3), one O(4), one O(5), one O(6), one O(7), and one O(8) atom 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 34-62°. The W(2)-O(3) bond length is 2.04 Å. The W(2)-O(4) bond length is 2.09 Å. The W(2)-O(5) bond length is 2.00 Å. The W(2)-O(6) bond length is 1.81 Å. The W(2)-O(7) bond length is 2.27 Å. The W(2)-O(8) bond length is 2.13 Å. Cu(1) is bonded in a linear geometry to one O(3) and one O(8) atom. The Cu(1)-O(3) bond length is 1.83 Å. The Cu(1)-O(8) bond length is 1.83 Å. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a distorted bent 150 degrees geometry to one Y(1) and one W(1) atom. In the second O site, O(2) is bonded in a T-shaped geometry to one Mg(1), one Y(1), and one W(1) atom. In the third O site, O(3) is bonded in a 4-coordinate geometry to one Mg(1), one W(1), one W(2), and one Cu(1) atom. In the fourth O site, O(4) is bonded in a 4-coordinate geometry to one Mg(1), one Y(1), one W(1), and one W(2) atom. In the fifth O site, O(5) is bonded in a T-shaped geometry to one Mg(1), one Y(1), and one W(2) atom. In the sixth O site, O(6) is bonded in a distorted bent 150 degrees geometry to one Y(1) and one W(2) atom. In the seventh O site, O(7) is bonded in a 4-coordinate geometry to one Mg(1), one Y(1), one W(1), and one W(2) atom. In the eighth O site, O(8) is bonded in a 4-coordinate geometry to one Mg(1), one W(1), one W(2), and one Cu(1) atom.