EuCu(WO4)2 crystallizes in the triclinic P-1 space group. Eu(1) is bonded in a 8-coordinate geometry to one O(1), one O(2), one O(3), one O(4), one O(7), one O(8), and two equivalent O(5) atoms. There are two inequivalent W sites. In the first W site, W(1) is bonded in a distorted octahedral geometry to one O(1), one O(2), one O(3), one O(6), one O(7), and one O(8) atom. In the second W site, W(2) is bonded in a 6-coordinate geometry to one O(3), one O(4), one O(5), one O(8), and two equivalent O(6) atoms. Cu(1) is bonded in a distorted trigonal non-coplanar geometry to one O(1), one O(6), and one O(7) atom. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal non-coplanar geometry to one Eu(1), one W(1), and one Cu(1) atom. In the second O site, O(2) is bonded in a bent 150 degrees geometry to one Eu(1) and one W(1) atom. In the third O site, O(3) is bonded in a distorted trigonal non-coplanar geometry to one Eu(1), one W(1), and one W(2) atom. In the fourth O site, O(4) is bonded in a bent 150 degrees geometry to one Eu(1) and one W(2) atom. In the fifth O site, O(5) is bonded in a 3-coordinate geometry to two equivalent Eu(1) and one W(2) atom. In the sixth O site, O(6) is bonded to one W(1), two equivalent W(2), and one Cu(1) atom to form distorted edge-sharing OCuW3 tetrahedra. In the seventh O site, O(7) is bonded in a 3-coordinate geometry to one Eu(1), one W(1), and one Cu(1) atom. In the eighth O site, O(8) is bonded in a distorted trigonal non-coplanar geometry to one Eu(1), one W(1), and one W(2) atom.
EuCu(WO4)2 crystallizes in the triclinic P-1 space group. Eu(1) is bonded in a 8-coordinate geometry to one O(1), one O(2), one O(3), one O(4), one O(7), one O(8), and two equivalent O(5) atoms. The Eu(1)-O(1) bond length is 2.51 Å. The Eu(1)-O(2) bond length is 2.41 Å. The Eu(1)-O(3) bond length is 2.51 Å. The Eu(1)-O(4) bond length is 2.46 Å. The Eu(1)-O(7) bond length is 2.75 Å. The Eu(1)-O(8) bond length is 2.52 Å. There is one shorter (2.46 Å) and one longer (2.74 Å) Eu(1)-O(5) bond length. There are two inequivalent W sites. In the first W site, W(1) is bonded in a distorted octahedral geometry to one O(1), one O(2), one O(3), one O(6), one O(7), and one O(8) atom. The W(1)-O(1) bond length is 1.87 Å. The W(1)-O(2) bond length is 1.82 Å. The W(1)-O(3) bond length is 2.07 Å. The W(1)-O(6) bond length is 2.17 Å. The W(1)-O(7) bond length is 1.84 Å. The W(1)-O(8) bond length is 2.12 Å. In the second W site, W(2) is bonded in a 6-coordinate geometry to one O(3), one O(4), one O(5), one O(8), and two equivalent O(6) atoms. The W(2)-O(3) bond length is 1.97 Å. The W(2)-O(4) bond length is 1.78 Å. The W(2)-O(5) bond length is 1.83 Å. The W(2)-O(8) bond length is 1.93 Å. There is one shorter (2.13 Å) and one longer (2.36 Å) W(2)-O(6) bond length. Cu(1) is bonded in a distorted trigonal non-coplanar geometry to one O(1), one O(6), and one O(7) atom. The Cu(1)-O(1) bond length is 1.99 Å. The Cu(1)-O(6) bond length is 1.93 Å. The Cu(1)-O(7) bond length is 1.88 Å. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal non-coplanar geometry to one Eu(1), one W(1), and one Cu(1) atom. In the second O site, O(2) is bonded in a bent 150 degrees geometry to one Eu(1) and one W(1) atom. In the third O site, O(3) is bonded in a distorted trigonal non-coplanar geometry to one Eu(1), one W(1), and one W(2) atom. In the fourth O site, O(4) is bonded in a bent 150 degrees geometry to one Eu(1) and one W(2) atom. In the fifth O site, O(5) is bonded in a 3-coordinate geometry to two equivalent Eu(1) and one W(2) atom. In the sixth O site, O(6) is bonded to one W(1), two equivalent W(2), and one Cu(1) atom to form distorted edge-sharing OCuW3 tetrahedra. In the seventh O site, O(7) is bonded in a 3-coordinate geometry to one Eu(1), one W(1), and one Cu(1) atom. In the eighth O site, O(8) is bonded in a distorted trigonal non-coplanar geometry to one Eu(1), one W(1), and one W(2) atom.