W3AlSe2O8Cl crystallizes in the triclinic P1 space group. There are six inequivalent W sites. In the first W site, W(1) is bonded in a distorted see-saw-like geometry to one Se(1), one O(1), one O(13), one O(4), and one O(7) atom. In the second W site, W(2) is bonded in a 3-coordinate geometry to one Se(3), one O(12), one O(14), one O(5), and one Cl(2) atom. In the third W site, W(3) is bonded in a 3-coordinate geometry to one Se(1), one O(10), one O(7), one O(8), and one Cl(2) atom. In the fourth W site, W(4) is bonded in a 3-coordinate geometry to one Se(4), one O(12), one O(15), one O(3), and one Cl(1) atom. In the fifth W site, W(5) is bonded to one Se(3), one O(1), one O(11), one O(16), and one O(2) atom to form distorted WSeO4 tetrahedra that share  an edgeedge with one Al(1)O5 trigonal bipyramid. In the sixth W site, W(6) is bonded in a 4-coordinate geometry to one Se(3), one O(11), one O(12), one O(6), one O(9), and one Cl(1) atom. There are two inequivalent Al sites. In the first Al site, Al(1) is bonded to one O(14), one O(16), one O(2), one O(4), and one O(9) atom to form distorted AlO5 trigonal bipyramids that share  an edgeedge with one W(5)SeO4 tetrahedra. In the second Al site, Al(2) is bonded in a tetrahedral geometry to one O(13), one O(3), one O(5), and one O(6) atom. There are four inequivalent Se sites. In the first Se site, Se(1) is bonded in a distorted L-shaped geometry to one W(1) and one W(3) atom. In the second Se site, Se(2) is bonded in a single-bond geometry to one Se(4) and one O(10) atom. In the third Se site, Se(3) is bonded in a distorted T-shaped geometry to one W(2), one W(5), and one W(6) atom. In the fourth Se site, Se(4) is bonded in a water-like geometry to one W(4) and one Se(2) atom. There are sixteen inequivalent O sites. In the first O site, O(1) is bonded in a bent 150 degrees geometry to one W(1) and one W(5) atom. In the second O site, O(2) is bonded in a water-like geometry to one W(5) and one Al(1) atom. In the third O site, O(3) is bonded in a bent 150 degrees geometry to one W(4) and one Al(2) atom. In the fourth O site, O(4) is bonded in a bent 150 degrees geometry to one W(1) and one Al(1) atom. In the fifth O site, O(5) is bonded in a distorted bent 120 degrees geometry to one W(2) and one Al(2) atom. In the sixth O site, O(6) is bonded in a bent 120 degrees geometry to one W(6) and one Al(2) atom. In the seventh O site, O(7) is bonded in a water-like geometry to one W(1) and one W(3) atom. In the eighth O site, O(8) is bonded in a single-bond geometry to one W(3) atom. In the ninth O site, O(9) is bonded in a bent 150 degrees geometry to one W(6) and one Al(1) atom. In the tenth O site, O(10) is bonded in a distorted bent 150 degrees geometry to one W(3) and one Se(2) atom. In the eleventh O site, O(11) is bonded in a bent 120 degrees geometry to one W(5) and one W(6) atom. In the twelfth O site, O(12) is bonded in a trigonal non-coplanar geometry to one W(2), one W(4), and one W(6) atom. In the thirteenth O site, O(13) is bonded in a bent 150 degrees geometry to one W(1) and one Al(2) atom. In the fourteenth O site, O(14) is bonded in a bent 150 degrees geometry to one W(2) and one Al(1) atom. In the fifteenth O site, O(15) is bonded in a single-bond geometry to one W(4) atom. In the sixteenth O site, O(16) is bonded in an L-shaped geometry to one W(5) and one Al(1) atom. There are two inequivalent Cl sites. In the first Cl site, Cl(1) is bonded in an L-shaped geometry to one W(4) and one W(6) atom. In the second Cl site, Cl(2) is bonded in a bent 120 degrees geometry to one W(2) and one W(3) atom.
W3AlSe2O8Cl crystallizes in the triclinic P1 space group. There are six inequivalent W sites. In the first W site, W(1) is bonded in a distorted see-saw-like geometry to one Se(1), one O(1), one O(13), one O(4), and one O(7) atom. The W(1)-Se(1) bond length is 2.51 Å. The W(1)-O(1) bond length is 2.07 Å. The W(1)-O(13) bond length is 1.86 Å. The W(1)-O(4) bond length is 1.83 Å. The W(1)-O(7) bond length is 2.11 Å. In the second W site, W(2) is bonded in a 3-coordinate geometry to one Se(3), one O(12), one O(14), one O(5), and one Cl(2) atom. The W(2)-Se(3) bond length is 2.71 Å. The W(2)-O(12) bond length is 2.18 Å. The W(2)-O(14) bond length is 1.85 Å. The W(2)-O(5) bond length is 1.94 Å. The W(2)-Cl(2) bond length is 2.68 Å. In the third W site, W(3) is bonded in a 3-coordinate geometry to one Se(1), one O(10), one O(7), one O(8), and one Cl(2) atom. The W(3)-Se(1) bond length is 2.67 Å. The W(3)-O(10) bond length is 1.89 Å. The W(3)-O(7) bond length is 1.83 Å. The W(3)-O(8) bond length is 1.76 Å. The W(3)-Cl(2) bond length is 2.49 Å. In the fourth W site, W(4) is bonded in a 3-coordinate geometry to one Se(4), one O(12), one O(15), one O(3), and one Cl(1) atom. The W(4)-Se(4) bond length is 2.62 Å. The W(4)-O(12) bond length is 1.98 Å. The W(4)-O(15) bond length is 1.73 Å. The W(4)-O(3) bond length is 1.81 Å. The W(4)-Cl(1) bond length is 2.49 Å. In the fifth W site, W(5) is bonded to one Se(3), one O(1), one O(11), one O(16), and one O(2) atom to form distorted WSeO4 tetrahedra that share  an edgeedge with one Al(1)O5 trigonal bipyramid. The W(5)-Se(3) bond length is 2.85 Å. The W(5)-O(1) bond length is 1.85 Å. The W(5)-O(11) bond length is 1.87 Å. The W(5)-O(16) bond length is 1.81 Å. The W(5)-O(2) bond length is 1.85 Å. In the sixth W site, W(6) is bonded in a 4-coordinate geometry to one Se(3), one O(11), one O(12), one O(6), one O(9), and one Cl(1) atom. The W(6)-Se(3) bond length is 2.52 Å. The W(6)-O(11) bond length is 2.05 Å. The W(6)-O(12) bond length is 2.17 Å. The W(6)-O(6) bond length is 1.89 Å. The W(6)-O(9) bond length is 1.85 Å. The W(6)-Cl(1) bond length is 2.71 Å. There are two inequivalent Al sites. In the first Al site, Al(1) is bonded to one O(14), one O(16), one O(2), one O(4), and one O(9) atom to form distorted AlO5 trigonal bipyramids that share  an edgeedge with one W(5)SeO4 tetrahedra. The Al(1)-O(14) bond length is 1.84 Å. The Al(1)-O(16) bond length is 2.07 Å. The Al(1)-O(2) bond length is 1.90 Å. The Al(1)-O(4) bond length is 1.78 Å. The Al(1)-O(9) bond length is 1.80 Å. In the second Al site, Al(2) is bonded in a tetrahedral geometry to one O(13), one O(3), one O(5), and one O(6) atom. The Al(2)-O(13) bond length is 1.76 Å. The Al(2)-O(3) bond length is 1.79 Å. The Al(2)-O(5) bond length is 1.75 Å. The Al(2)-O(6) bond length is 1.76 Å. There are four inequivalent Se sites. In the first Se site, Se(1) is bonded in a distorted L-shaped geometry to one W(1) and one W(3) atom. In the second Se site, Se(2) is bonded in a single-bond geometry to one Se(4) and one O(10) atom. The Se(2)-Se(4) bond length is 2.33 Å. The Se(2)-O(10) bond length is 1.90 Å. In the third Se site, Se(3) is bonded in a distorted T-shaped geometry to one W(2), one W(5), and one W(6) atom. In the fourth Se site, Se(4) is bonded in a water-like geometry to one W(4) and one Se(2) atom. There are sixteen inequivalent O sites. In the first O site, O(1) is bonded in a bent 150 degrees geometry to one W(1) and one W(5) atom. In the second O site, O(2) is bonded in a water-like geometry to one W(5) and one Al(1) atom. In the third O site, O(3) is bonded in a bent 150 degrees geometry to one W(4) and one Al(2) atom. In the fourth O site, O(4) is bonded in a bent 150 degrees geometry to one W(1) and one Al(1) atom. In the fifth O site, O(5) is bonded in a distorted bent 120 degrees geometry to one W(2) and one Al(2) atom. In the sixth O site, O(6) is bonded in a bent 120 degrees geometry to one W(6) and one Al(2) atom. In the seventh O site, O(7) is bonded in a water-like geometry to one W(1) and one W(3) atom. In the eighth O site, O(8) is bonded in a single-bond geometry to one W(3) atom. In the ninth O site, O(9) is bonded in a bent 150 degrees geometry to one W(6) and one Al(1) atom. In the tenth O site, O(10) is bonded in a distorted bent 150 degrees geometry to one W(3) and one Se(2) atom. In the eleventh O site, O(11) is bonded in a bent 120 degrees geometry to one W(5) and one W(6) atom. In the twelfth O site, O(12) is bonded in a trigonal non-coplanar geometry to one W(2), one W(4), and one W(6) atom. In the thirteenth O site, O(13) is bonded in a bent 150 degrees geometry to one W(1) and one Al(2) atom. In the fourteenth O site, O(14) is bonded in a bent 150 degrees geometry to one W(2) and one Al(1) atom. In the fifteenth O site, O(15) is bonded in a single-bond geometry to one W(4) atom. In the sixteenth O site, O(16) is bonded in an L-shaped geometry to one W(5) and one Al(1) atom. There are two inequivalent Cl sites. In the first Cl site, Cl(1) is bonded in an L-shaped geometry to one W(4) and one W(6) atom. In the second Cl site, Cl(2) is bonded in a bent 120 degrees geometry to one W(2) and one W(3) atom.