CuAl(WO4)2 crystallizes in the triclinic P-1 space group. W(1) is bonded to one O(1), one O(2), two equivalent O(3), and two equivalent O(4) atoms to form distorted WO6 octahedra that share corners with four equivalent Al(1)O6 octahedra and edges with two equivalent W(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 33-54°. Cu(1) is bonded in a linear geometry to two equivalent O(3) and two equivalent O(4) atoms. Al(1) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(4) atoms to form AlO6 octahedra that share corners with eight equivalent W(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 33-54°. There are four inequivalent O sites. In the first O site, O(1) is bonded in a bent 150 degrees geometry to one W(1) and one Al(1) atom. In the second O site, O(2) is bonded in a bent 150 degrees geometry to one W(1) and one Al(1) atom. In the third O site, O(3) is bonded in a 3-coordinate geometry to two equivalent W(1) and one Cu(1) atom. In the fourth O site, O(4) is bonded in a 4-coordinate geometry to two equivalent W(1), one Cu(1), and one Al(1) atom.
CuAl(WO4)2 crystallizes in the triclinic P-1 space group. W(1) is bonded to one O(1), one O(2), two equivalent O(3), and two equivalent O(4) atoms to form distorted WO6 octahedra that share corners with four equivalent Al(1)O6 octahedra and edges with two equivalent W(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 33-54°. The W(1)-O(1) bond length is 1.83 Å. The W(1)-O(2) bond length is 1.84 Å. There is one shorter (1.91 Å) and one longer (2.13 Å) W(1)-O(3) bond length. There is one shorter (2.02 Å) and one longer (2.17 Å) W(1)-O(4) bond length. Cu(1) is bonded in a linear geometry to two equivalent O(3) and two equivalent O(4) atoms. Both Cu(1)-O(3) bond lengths are 1.81 Å. Both Cu(1)-O(4) bond lengths are 2.63 Å. Al(1) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(4) atoms to form AlO6 octahedra that share corners with eight equivalent W(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 33-54°. Both Al(1)-O(1) bond lengths are 1.89 Å. Both Al(1)-O(2) bond lengths are 1.96 Å. Both Al(1)-O(4) bond lengths are 2.08 Å. There are four inequivalent O sites. In the first O site, O(1) is bonded in a bent 150 degrees geometry to one W(1) and one Al(1) atom. In the second O site, O(2) is bonded in a bent 150 degrees geometry to one W(1) and one Al(1) atom. In the third O site, O(3) is bonded in a 3-coordinate geometry to two equivalent W(1) and one Cu(1) atom. In the fourth O site, O(4) is bonded in a 4-coordinate geometry to two equivalent W(1), one Cu(1), and one Al(1) atom.