Na2U(WO5)2 crystallizes in the triclinic P-1 space group. There are two inequivalent Na sites. In the first Na site, Na(1) is bonded in a 7-coordinate geometry to one O(10), one O(2), one O(3), one O(4), one O(8), and two equivalent O(7) atoms. In the second Na site, Na(2) is bonded in a 7-coordinate geometry to one O(10), one O(2), one O(6), one O(7), one O(9), and two equivalent O(4) atoms. U(1) is bonded in a 7-coordinate geometry to one O(1), one O(4), one O(7), two equivalent O(8), and two equivalent O(9) atoms. There are two inequivalent W sites. In the first W site, W(1) is bonded to one O(1), one O(10), one O(5), one O(8), and two equivalent O(3) atoms to form a mixture of distorted corner and edge-sharing WO6 octahedra. The corner-sharing octahedral tilt angles range from 1-35°. In the second W site, W(2) is bonded to one O(1), one O(2), one O(5), one O(9), and two equivalent O(6) atoms to form a mixture of distorted corner and edge-sharing WO6 octahedra. The corner-sharing octahedral tilt angles range from 1-35°. There are ten inequivalent O sites. In the first O site, O(1) is bonded in a 3-coordinate geometry to one U(1), one W(1), and one W(2) atom. In the second O site, O(2) is bonded in a distorted trigonal planar geometry to one Na(1), one Na(2), and one W(2) atom. In the third O site, O(3) is bonded in a 3-coordinate geometry to one Na(1) and two equivalent W(1) atoms. In the fourth O site, O(4) is bonded in a 4-coordinate geometry to one Na(1), two equivalent Na(2), and one U(1) atom. In the fifth O site, O(5) is bonded in a linear geometry to 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 Na(2) and two equivalent W(2) atoms. In the seventh O site, O(7) is bonded in a distorted single-bond geometry to one Na(2), two equivalent Na(1), and one U(1) atom. In the eighth O site, O(8) is bonded to one Na(1), two equivalent U(1), and one W(1) atom to form distorted edge-sharing ONaU2W trigonal pyramids. In the ninth O site, O(9) is bonded in a 3-coordinate geometry to one Na(2), two equivalent U(1), and one W(2) atom. In the tenth O site, O(10) is bonded in a distorted trigonal planar geometry to one Na(1), one Na(2), and one W(1) atom.
Na2U(WO5)2 crystallizes in the triclinic P-1 space group. There are two inequivalent Na sites. In the first Na site, Na(1) is bonded in a 7-coordinate geometry to one O(10), one O(2), one O(3), one O(4), one O(8), and two equivalent O(7) atoms. The Na(1)-O(10) bond length is 2.36 Å. The Na(1)-O(2) bond length is 2.39 Å. The Na(1)-O(3) bond length is 2.39 Å. The Na(1)-O(4) bond length is 2.57 Å. The Na(1)-O(8) bond length is 2.81 Å. There is one shorter (2.63 Å) and one longer (2.66 Å) Na(1)-O(7) bond length. In the second Na site, Na(2) is bonded in a 7-coordinate geometry to one O(10), one O(2), one O(6), one O(7), one O(9), and two equivalent O(4) atoms. The Na(2)-O(10) bond length is 2.48 Å. The Na(2)-O(2) bond length is 2.56 Å. The Na(2)-O(6) bond length is 2.39 Å. The Na(2)-O(7) bond length is 2.74 Å. The Na(2)-O(9) bond length is 2.94 Å. There is one shorter (2.58 Å) and one longer (2.89 Å) Na(2)-O(4) bond length. U(1) is bonded in a 7-coordinate geometry to one O(1), one O(4), one O(7), two equivalent O(8), and two equivalent O(9) atoms. The U(1)-O(1) bond length is 2.54 Å. The U(1)-O(4) bond length is 1.86 Å. The U(1)-O(7) bond length is 1.86 Å. There is one shorter (2.28 Å) and one longer (2.36 Å) U(1)-O(8) bond length. There is one shorter (2.28 Å) and one longer (2.34 Å) U(1)-O(9) bond length. There are two inequivalent W sites. In the first W site, W(1) is bonded to one O(1), one O(10), one O(5), one O(8), and two equivalent O(3) atoms to form a mixture of distorted corner and edge-sharing WO6 octahedra. The corner-sharing octahedral tilt angles range from 1-35°. The W(1)-O(1) bond length is 2.00 Å. The W(1)-O(10) bond length is 1.78 Å. The W(1)-O(5) bond length is 1.92 Å. The W(1)-O(8) bond length is 2.03 Å. There is one shorter (1.86 Å) and one longer (2.24 Å) W(1)-O(3) bond length. In the second W site, W(2) is bonded to one O(1), one O(2), one O(5), one O(9), and two equivalent O(6) atoms to form a mixture of distorted corner and edge-sharing WO6 octahedra. The corner-sharing octahedral tilt angles range from 1-35°. The W(2)-O(1) bond length is 2.00 Å. The W(2)-O(2) bond length is 1.78 Å. The W(2)-O(5) bond length is 1.92 Å. The W(2)-O(9) bond length is 2.03 Å. There is one shorter (1.86 Å) and one longer (2.25 Å) W(2)-O(6) bond length. There are ten inequivalent O sites. In the first O site, O(1) is bonded in a 3-coordinate geometry to one U(1), one W(1), and one W(2) atom. In the second O site, O(2) is bonded in a distorted trigonal planar geometry to one Na(1), one Na(2), and one W(2) atom. In the third O site, O(3) is bonded in a 3-coordinate geometry to one Na(1) and two equivalent W(1) atoms. In the fourth O site, O(4) is bonded in a 4-coordinate geometry to one Na(1), two equivalent Na(2), and one U(1) atom. In the fifth O site, O(5) is bonded in a linear geometry to 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 Na(2) and two equivalent W(2) atoms. In the seventh O site, O(7) is bonded in a distorted single-bond geometry to one Na(2), two equivalent Na(1), and one U(1) atom. In the eighth O site, O(8) is bonded to one Na(1), two equivalent U(1), and one W(1) atom to form distorted edge-sharing ONaU2W trigonal pyramids. In the ninth O site, O(9) is bonded in a 3-coordinate geometry to one Na(2), two equivalent U(1), and one W(2) atom. In the tenth O site, O(10) is bonded in a distorted trigonal planar geometry to one Na(1), one Na(2), and one W(1) atom.