Li2UWO7 crystallizes in the monoclinic Cc space group. There are four inequivalent Li sites. In the first Li site, Li(1) is bonded to one O(11), one O(3), one O(4), one O(6), and one O(7) atom to form LiO5 square pyramids that share corners with two equivalent W(1)O6 octahedra, corners with two equivalent W(2)O6 octahedra,  a cornercorner with one U(2)O7 pentagonal bipyramid, and  an edgeedge with one Li(2)O5 trigonal pyramid. The corner-sharing octahedral tilt angles range from 33-50°. In the second Li site, Li(2) is bonded to one O(1), one O(12), one O(2), one O(3), and one O(7) atom to form distorted LiO5 trigonal pyramids that share corners with two equivalent W(1)O6 octahedra,  an edgeedge with one W(2)O6 octahedra,  an edgeedge with one U(2)O7 pentagonal bipyramid, and  an edgeedge with one Li(1)O5 square pyramid. The corner-sharing octahedral tilt angles range from 63-66°. In the third Li site, Li(3) is bonded in a 5-coordinate geometry to one O(10), one O(11), one O(2), one O(6), and one O(9) atom. In the fourth Li site, Li(4) is bonded in a 5-coordinate geometry to one O(10), one O(11), one O(2), one O(7), and one O(8) atom. There are two inequivalent U sites. In the first U site, U(1) is bonded in a 7-coordinate geometry to one O(10), one O(13), one O(14), one O(2), one O(5), one O(8), and one O(9) atom. In the second U site, U(2) is bonded to one O(1), one O(11), one O(12), one O(13), one O(14), one O(8), and one O(9) atom to form distorted UO7 pentagonal bipyramids that share  a cornercorner with one W(1)O6 octahedra,  a cornercorner with one W(2)O6 octahedra,  a cornercorner with one Li(1)O5 square pyramid,  an edgeedge with one W(1)O6 octahedra,  an edgeedge with one W(2)O6 octahedra, and  an edgeedge with one Li(2)O5 trigonal pyramid. The corner-sharing octahedral tilt angles are 50°. There are two inequivalent W sites. In the first W site, W(1) is bonded to one O(12), one O(13), one O(3), one O(5), one O(6), and one O(8) atom to form distorted WO6 octahedra that share corners with two equivalent W(2)O6 octahedra,  a cornercorner with one U(2)O7 pentagonal bipyramid, corners with two equivalent Li(1)O5 square pyramids, corners with two equivalent Li(2)O5 trigonal pyramids, and  an edgeedge with one U(2)O7 pentagonal bipyramid. The corner-sharing octahedral tilt angles range from 36-41°. In the second W site, W(2) is bonded to one O(12), one O(14), one O(4), one O(5), one O(7), and one O(9) atom to form WO6 octahedra that share corners with two equivalent W(1)O6 octahedra,  a cornercorner with one U(2)O7 pentagonal bipyramid, corners with two equivalent Li(1)O5 square pyramids,  an edgeedge with one U(2)O7 pentagonal bipyramid, and  an edgeedge with one Li(2)O5 trigonal pyramid. The corner-sharing octahedral tilt angles range from 36-41°. There are fourteen inequivalent O sites. In the first O site, O(1) is bonded in a distorted bent 120 degrees geometry to one Li(2) and one U(2) atom. In the second O site, O(2) is bonded in a 4-coordinate geometry to one Li(2), one Li(3), one Li(4), and one U(1) atom. In the third O site, O(3) is bonded in a distorted trigonal planar geometry to one Li(1), one Li(2), and one W(1) atom. In the fourth O site, O(4) is bonded in a bent 150 degrees geometry to one Li(1) and one W(2) atom. In the fifth O site, O(5) is bonded in a 3-coordinate geometry to one U(1), one W(1), and one W(2) atom. In the sixth O site, O(6) is bonded in a distorted trigonal planar geometry to one Li(1), one Li(3), and one W(1) atom. In the seventh O site, O(7) is bonded in a rectangular see-saw-like geometry to one Li(1), one Li(2), one Li(4), and one W(2) atom. In the eighth O site, O(8) is bonded to one Li(4), one U(1), one U(2), and one W(1) atom to form distorted OLiU2W tetrahedra that share corners with two equivalent O(9)LiU2W tetrahedra and corners with two equivalent O(11)Li3U trigonal pyramids. In the ninth O site, O(9) is bonded to one Li(3), one U(1), one U(2), and one W(2) atom to form distorted OLiU2W tetrahedra that share corners with two equivalent O(8)LiU2W tetrahedra and corners with two equivalent O(11)Li3U trigonal pyramids. In the tenth O site, O(10) is bonded in a trigonal non-coplanar geometry to one Li(3), one Li(4), and one U(1) atom. In the eleventh O site, O(11) is bonded to one Li(1), one Li(3), one Li(4), and one U(2) atom to form distorted corner-sharing OLi3U trigonal pyramids. In the twelfth O site, O(12) is bonded in a 4-coordinate geometry to one Li(2), one U(2), one W(1), and one W(2) atom. In the thirteenth O site, O(13) is bonded in a distorted trigonal planar geometry to one U(1), one U(2), and one W(1) atom. In the fourteenth O site, O(14) is bonded in a distorted trigonal planar geometry to one U(1), one U(2), and one W(2) atom.
Li2UWO7 crystallizes in the monoclinic Cc space group. There are four inequivalent Li sites. In the first Li site, Li(1) is bonded to one O(11), one O(3), one O(4), one O(6), and one O(7) atom to form LiO5 square pyramids that share corners with two equivalent W(1)O6 octahedra, corners with two equivalent W(2)O6 octahedra,  a cornercorner with one U(2)O7 pentagonal bipyramid, and  an edgeedge with one Li(2)O5 trigonal pyramid. The corner-sharing octahedral tilt angles range from 33-50°. The Li(1)-O(11) bond length is 2.06 Å. The Li(1)-O(3) bond length is 2.03 Å. The Li(1)-O(4) bond length is 1.96 Å. The Li(1)-O(6) bond length is 2.02 Å. The Li(1)-O(7) bond length is 2.07 Å. In the second Li site, Li(2) is bonded to one O(1), one O(12), one O(2), one O(3), and one O(7) atom to form distorted LiO5 trigonal pyramids that share corners with two equivalent W(1)O6 octahedra,  an edgeedge with one W(2)O6 octahedra,  an edgeedge with one U(2)O7 pentagonal bipyramid, and  an edgeedge with one Li(1)O5 square pyramid. The corner-sharing octahedral tilt angles range from 63-66°. The Li(2)-O(1) bond length is 2.18 Å. The Li(2)-O(12) bond length is 2.65 Å. The Li(2)-O(2) bond length is 2.12 Å. The Li(2)-O(3) bond length is 2.00 Å. The Li(2)-O(7) bond length is 2.04 Å. In the third Li site, Li(3) is bonded in a 5-coordinate geometry to one O(10), one O(11), one O(2), one O(6), and one O(9) atom. The Li(3)-O(10) bond length is 2.29 Å. The Li(3)-O(11) bond length is 2.34 Å. The Li(3)-O(2) bond length is 2.49 Å. The Li(3)-O(6) bond length is 2.07 Å. The Li(3)-O(9) bond length is 2.26 Å. In the fourth Li site, Li(4) is bonded in a 5-coordinate geometry to one O(10), one O(11), one O(2), one O(7), and one O(8) atom. The Li(4)-O(10) bond length is 2.28 Å. The Li(4)-O(11) bond length is 2.33 Å. The Li(4)-O(2) bond length is 2.47 Å. The Li(4)-O(7) bond length is 2.11 Å. The Li(4)-O(8) bond length is 2.22 Å. There are two inequivalent U sites. In the first U site, U(1) is bonded in a 7-coordinate geometry to one O(10), one O(13), one O(14), one O(2), one O(5), one O(8), and one O(9) atom. The U(1)-O(10) bond length is 1.86 Å. The U(1)-O(13) bond length is 2.24 Å. The U(1)-O(14) bond length is 2.23 Å. The U(1)-O(2) bond length is 1.89 Å. The U(1)-O(5) bond length is 2.49 Å. The U(1)-O(8) bond length is 2.39 Å. The U(1)-O(9) bond length is 2.42 Å. In the second U site, U(2) is bonded to one O(1), one O(11), one O(12), one O(13), one O(14), one O(8), and one O(9) atom to form distorted UO7 pentagonal bipyramids that share  a cornercorner with one W(1)O6 octahedra,  a cornercorner with one W(2)O6 octahedra,  a cornercorner with one Li(1)O5 square pyramid,  an edgeedge with one W(1)O6 octahedra,  an edgeedge with one W(2)O6 octahedra, and  an edgeedge with one Li(2)O5 trigonal pyramid. The corner-sharing octahedral tilt angles are 50°. The U(2)-O(1) bond length is 1.86 Å. The U(2)-O(11) bond length is 1.88 Å. The U(2)-O(12) bond length is 2.50 Å. The U(2)-O(13) bond length is 2.36 Å. The U(2)-O(14) bond length is 2.35 Å. The U(2)-O(8) bond length is 2.27 Å. The U(2)-O(9) bond length is 2.29 Å. There are two inequivalent W sites. In the first W site, W(1) is bonded to one O(12), one O(13), one O(3), one O(5), one O(6), and one O(8) atom to form distorted WO6 octahedra that share corners with two equivalent W(2)O6 octahedra,  a cornercorner with one U(2)O7 pentagonal bipyramid, corners with two equivalent Li(1)O5 square pyramids, corners with two equivalent Li(2)O5 trigonal pyramids, and  an edgeedge with one U(2)O7 pentagonal bipyramid. The corner-sharing octahedral tilt angles range from 36-41°. The W(1)-O(12) bond length is 1.97 Å. The W(1)-O(13) bond length is 2.09 Å. The W(1)-O(3) bond length is 1.80 Å. The W(1)-O(5) bond length is 1.98 Å. The W(1)-O(6) bond length is 1.80 Å. The W(1)-O(8) bond length is 2.20 Å. In the second W site, W(2) is bonded to one O(12), one O(14), one O(4), one O(5), one O(7), and one O(9) atom to form WO6 octahedra that share corners with two equivalent W(1)O6 octahedra,  a cornercorner with one U(2)O7 pentagonal bipyramid, corners with two equivalent Li(1)O5 square pyramids,  an edgeedge with one U(2)O7 pentagonal bipyramid, and  an edgeedge with one Li(2)O5 trigonal pyramid. The corner-sharing octahedral tilt angles range from 36-41°. The W(2)-O(12) bond length is 1.99 Å. The W(2)-O(14) bond length is 2.14 Å. The W(2)-O(4) bond length is 1.77 Å. The W(2)-O(5) bond length is 1.97 Å. The W(2)-O(7) bond length is 1.83 Å. The W(2)-O(9) bond length is 2.13 Å. There are fourteen inequivalent O sites. In the first O site, O(1) is bonded in a distorted bent 120 degrees geometry to one Li(2) and one U(2) atom. In the second O site, O(2) is bonded in a 4-coordinate geometry to one Li(2), one Li(3), one Li(4), and one U(1) atom. In the third O site, O(3) is bonded in a distorted trigonal planar geometry to one Li(1), one Li(2), and one W(1) atom. In the fourth O site, O(4) is bonded in a bent 150 degrees geometry to one Li(1) and one W(2) atom. In the fifth O site, O(5) is bonded in a 3-coordinate geometry to one U(1), one W(1), and one W(2) atom. In the sixth O site, O(6) is bonded in a distorted trigonal planar geometry to one Li(1), one Li(3), and one W(1) atom. In the seventh O site, O(7) is bonded in a rectangular see-saw-like geometry to one Li(1), one Li(2), one Li(4), and one W(2) atom. In the eighth O site, O(8) is bonded to one Li(4), one U(1), one U(2), and one W(1) atom to form distorted OLiU2W tetrahedra that share corners with two equivalent O(9)LiU2W tetrahedra and corners with two equivalent O(11)Li3U trigonal pyramids. In the ninth O site, O(9) is bonded to one Li(3), one U(1), one U(2), and one W(2) atom to form distorted OLiU2W tetrahedra that share corners with two equivalent O(8)LiU2W tetrahedra and corners with two equivalent O(11)Li3U trigonal pyramids. In the tenth O site, O(10) is bonded in a trigonal non-coplanar geometry to one Li(3), one Li(4), and one U(1) atom. In the eleventh O site, O(11) is bonded to one Li(1), one Li(3), one Li(4), and one U(2) atom to form distorted corner-sharing OLi3U trigonal pyramids. In the twelfth O site, O(12) is bonded in a 4-coordinate geometry to one Li(2), one U(2), one W(1), and one W(2) atom. In the thirteenth O site, O(13) is bonded in a distorted trigonal planar geometry to one U(1), one U(2), and one W(1) atom. In the fourteenth O site, O(14) is bonded in a distorted trigonal planar geometry to one U(1), one U(2), and one W(2) atom.