CrAl(WO4)2 crystallizes in the triclinic P1 space group. 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 three equivalent Al(1)O4 tetrahedra and edges with two equivalent W(2)O6 octahedra. 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 two equivalent Al(1)O4 tetrahedra and edges with two equivalent W(1)O6 octahedra. Cr(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. Al(1) is bonded to one O(1), one O(2), one O(6), and one O(8) atom to form AlO4 tetrahedra that share corners with two equivalent W(2)O6 octahedra and corners with three equivalent W(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 10-66°. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a bent 120 degrees geometry to one W(1) and one Al(1) atom. In the second O site, O(2) is bonded in a distorted trigonal non-coplanar geometry to one W(1), one Cr(1), and one Al(1) atom. In the third O site, O(3) is bonded in a 3-coordinate geometry to one W(1), one W(2), and one Cr(1) atom. In the fourth O site, O(4) is bonded in a distorted trigonal non-coplanar geometry to one W(1), one W(2), and one Cr(1) atom. In the fifth O site, O(5) is bonded in a bent 120 degrees geometry to one W(2) and one Cr(1) atom. In the sixth O site, O(6) is bonded in a linear geometry to one W(2) and one Al(1) atom. In the seventh O site, O(7) is bonded in a 3-coordinate geometry to one W(1), one W(2), and one Cr(1) atom. In the eighth O site, O(8) is bonded in a 4-coordinate geometry to one W(1), one W(2), one Cr(1), and one Al(1) atom.
CrAl(WO4)2 crystallizes in the triclinic P1 space group. 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 three equivalent Al(1)O4 tetrahedra and edges with two equivalent W(2)O6 octahedra. The W(1)-O(1) bond length is 1.87 Å. The W(1)-O(2) bond length is 2.01 Å. The W(1)-O(3) bond length is 2.12 Å. The W(1)-O(4) bond length is 2.06 Å. The W(1)-O(7) bond length is 1.95 Å. The W(1)-O(8) bond length is 2.21 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 two equivalent Al(1)O4 tetrahedra and edges with two equivalent W(1)O6 octahedra. The W(2)-O(3) bond length is 1.96 Å. The W(2)-O(4) bond length is 1.91 Å. The W(2)-O(5) bond length is 1.80 Å. The W(2)-O(6) bond length is 1.85 Å. The W(2)-O(7) bond length is 2.16 Å. The W(2)-O(8) bond length is 2.19 Å. Cr(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 Cr(1)-O(2) bond length is 2.20 Å. The Cr(1)-O(3) bond length is 2.01 Å. The Cr(1)-O(4) bond length is 2.42 Å. The Cr(1)-O(5) bond length is 2.10 Å. The Cr(1)-O(7) bond length is 2.00 Å. The Cr(1)-O(8) bond length is 2.63 Å. Al(1) is bonded to one O(1), one O(2), one O(6), and one O(8) atom to form AlO4 tetrahedra that share corners with two equivalent W(2)O6 octahedra and corners with three equivalent W(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 10-66°. The Al(1)-O(1) bond length is 1.81 Å. The Al(1)-O(2) bond length is 1.82 Å. The Al(1)-O(6) bond length is 1.77 Å. The Al(1)-O(8) bond length is 1.82 Å. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a bent 120 degrees geometry to one W(1) and one Al(1) atom. In the second O site, O(2) is bonded in a distorted trigonal non-coplanar geometry to one W(1), one Cr(1), and one Al(1) atom. In the third O site, O(3) is bonded in a 3-coordinate geometry to one W(1), one W(2), and one Cr(1) atom. In the fourth O site, O(4) is bonded in a distorted trigonal non-coplanar geometry to one W(1), one W(2), and one Cr(1) atom. In the fifth O site, O(5) is bonded in a bent 120 degrees geometry to one W(2) and one Cr(1) atom. In the sixth O site, O(6) is bonded in a linear geometry to one W(2) and one Al(1) atom. In the seventh O site, O(7) is bonded in a 3-coordinate geometry to one W(1), one W(2), and one Cr(1) atom. In the eighth O site, O(8) is bonded in a 4-coordinate geometry to one W(1), one W(2), one Cr(1), and one Al(1) atom.