ErWO4Br crystallizes in the triclinic P-1 space group. There are two inequivalent Er sites. In the first Er site, Er(1) is bonded in a 4-coordinate geometry to one O(2), one O(4), one O(6), one O(8), one Br(2), and two equivalent Br(1) atoms. In the second Er site, Er(2) is bonded in a 6-coordinate geometry to one O(1), one O(3), one O(4), one O(5), one O(7), one O(8), and one Br(2) atom. There are two inequivalent W sites. In the first W site, W(1) is bonded in a tetrahedral geometry to one O(1), one O(2), one O(3), and one O(4) atom. In the second W site, W(2) is bonded in a tetrahedral geometry to one O(5), one O(6), one O(7), and one O(8) atom. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a bent 150 degrees geometry to one Er(2) and one W(1) atom. In the second O site, O(2) is bonded in a linear geometry to one Er(1) and one W(1) atom. In the third O site, O(3) is bonded in a bent 150 degrees geometry to one Er(2) and one W(1) atom. In the fourth O site, O(4) is bonded in a distorted trigonal planar geometry to one Er(1), one Er(2), and one W(1) atom. In the fifth O site, O(5) is bonded in a bent 150 degrees geometry to one Er(2) and one W(2) atom. In the sixth O site, O(6) is bonded in a linear geometry to one Er(1) and one W(2) atom. In the seventh O site, O(7) is bonded in a distorted bent 150 degrees geometry to one Er(2) and one W(2) atom. In the eighth O site, O(8) is bonded in a distorted trigonal planar geometry to one Er(1), one Er(2), and one W(2) atom. There are two inequivalent Br sites. In the first Br site, Br(1) is bonded in a water-like geometry to two equivalent Er(1) atoms. In the second Br site, Br(2) is bonded in a distorted bent 150 degrees geometry to one Er(1) and one Er(2) atom.
ErWO4Br crystallizes in the triclinic P-1 space group. There are two inequivalent Er sites. In the first Er site, Er(1) is bonded in a 4-coordinate geometry to one O(2), one O(4), one O(6), one O(8), one Br(2), and two equivalent Br(1) atoms. The Er(1)-O(2) bond length is 2.20 Å. The Er(1)-O(4) bond length is 2.38 Å. The Er(1)-O(6) bond length is 2.22 Å. The Er(1)-O(8) bond length is 2.25 Å. The Er(1)-Br(2) bond length is 2.87 Å. There is one shorter (2.88 Å) and one longer (2.91 Å) Er(1)-Br(1) bond length. In the second Er site, Er(2) is bonded in a 6-coordinate geometry to one O(1), one O(3), one O(4), one O(5), one O(7), one O(8), and one Br(2) atom. The Er(2)-O(1) bond length is 2.24 Å. The Er(2)-O(3) bond length is 2.21 Å. The Er(2)-O(4) bond length is 2.26 Å. The Er(2)-O(5) bond length is 2.24 Å. The Er(2)-O(7) bond length is 2.25 Å. The Er(2)-O(8) bond length is 2.37 Å. The Er(2)-Br(2) bond length is 3.01 Å. There are two inequivalent W sites. In the first W site, W(1) is bonded in a tetrahedral geometry to one O(1), one O(2), one O(3), and one O(4) atom. The W(1)-O(1) bond length is 1.77 Å. The W(1)-O(2) bond length is 1.77 Å. The W(1)-O(3) bond length is 1.78 Å. The W(1)-O(4) bond length is 1.83 Å. In the second W site, W(2) is bonded in a tetrahedral geometry to one O(5), one O(6), one O(7), and one O(8) atom. The W(2)-O(5) bond length is 1.77 Å. The W(2)-O(6) bond length is 1.78 Å. The W(2)-O(7) bond length is 1.79 Å. The W(2)-O(8) bond length is 1.84 Å. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a bent 150 degrees geometry to one Er(2) and one W(1) atom. In the second O site, O(2) is bonded in a linear geometry to one Er(1) and one W(1) atom. In the third O site, O(3) is bonded in a bent 150 degrees geometry to one Er(2) and one W(1) atom. In the fourth O site, O(4) is bonded in a distorted trigonal planar geometry to one Er(1), one Er(2), and one W(1) atom. In the fifth O site, O(5) is bonded in a bent 150 degrees geometry to one Er(2) and one W(2) atom. In the sixth O site, O(6) is bonded in a linear geometry to one Er(1) and one W(2) atom. In the seventh O site, O(7) is bonded in a distorted bent 150 degrees geometry to one Er(2) and one W(2) atom. In the eighth O site, O(8) is bonded in a distorted trigonal planar geometry to one Er(1), one Er(2), and one W(2) atom. There are two inequivalent Br sites. In the first Br site, Br(1) is bonded in a water-like geometry to two equivalent Er(1) atoms. In the second Br site, Br(2) is bonded in a distorted bent 150 degrees geometry to one Er(1) and one Er(2) atom.