Na13W18Fe4Sb2(C4O43)2 crystallizes in the triclinic P-1 space group. There are seven inequivalent Na sites. In the first Na site, Na(1) is bonded in a 4-coordinate geometry to one O(33), one O(4), and two equivalent O(38) atoms. The Na(1)-O(33) bond length is 2.50 Å. The Na(1)-O(4) bond length is 2.43 Å. There is one shorter (2.38 Å) and one longer (2.41 Å) Na(1)-O(38) bond length. In the second Na site, Na(2) is bonded to one O(35), one O(36), one O(37), one O(43), and two equivalent O(34) atoms to form distorted edge-sharing NaO6 octahedra. The Na(2)-O(35) bond length is 2.35 Å. The Na(2)-O(36) bond length is 2.42 Å. The Na(2)-O(37) bond length is 2.32 Å. The Na(2)-O(43) bond length is 2.39 Å. There is one shorter (2.43 Å) and one longer (2.57 Å) Na(2)-O(34) bond length. In the third Na site, Na(3) is bonded to one O(32), one O(39), one O(42), and one O(5) atom to form distorted NaO4 trigonal pyramids that share  a cornercorner with one Fe(2)O6 octahedra. The corner-sharing octahedral tilt angles are 64°. The Na(3)-O(32) bond length is 2.47 Å. The Na(3)-O(39) bond length is 2.55 Å. The Na(3)-O(42) bond length is 2.41 Å. The Na(3)-O(5) bond length is 2.64 Å. In the fourth Na site, Na(4) is bonded in a rectangular see-saw-like geometry to one O(10), one O(22), one O(40), and one O(41) atom. The Na(4)-O(10) bond length is 2.32 Å. The Na(4)-O(22) bond length is 2.45 Å. The Na(4)-O(40) bond length is 2.38 Å. The Na(4)-O(41) bond length is 2.44 Å. In the fifth Na site, Na(5) is bonded in a rectangular see-saw-like geometry to one O(40), one O(41), and two equivalent O(17) atoms. The Na(5)-O(40) bond length is 2.39 Å. The Na(5)-O(41) bond length is 2.39 Å. There is one shorter (2.47 Å) and one longer (2.51 Å) Na(5)-O(17) bond length. In the sixth Na site, Na(6) is bonded in an L-shaped geometry to one O(37) and one O(43) atom. The Na(6)-O(37) bond length is 2.43 Å. The Na(6)-O(43) bond length is 2.40 Å. In the seventh Na site, Na(7) is bonded in a square co-planar geometry to two equivalent O(39) and two equivalent O(42) atoms. Both Na(7)-O(39) bond lengths are 2.45 Å. Both Na(7)-O(42) bond lengths are 2.40 Å. There are nine inequivalent W sites. In the first W site, W(1) is bonded in a 6-coordinate geometry to one O(1), one O(2), one O(3), one O(4), one O(5), and one O(6) atom. The W(1)-O(1) bond length is 1.78 Å. The W(1)-O(2) bond length is 1.79 Å. The W(1)-O(3) bond length is 1.79 Å. The W(1)-O(4) bond length is 2.03 Å. The W(1)-O(5) bond length is 2.05 Å. The W(1)-O(6) bond length is 2.23 Å. In the second W site, W(2) is bonded in a 3-coordinate geometry to one O(5), one O(6), and one O(7) atom. The W(2)-O(5) bond length is 1.86 Å. The W(2)-O(6) bond length is 2.36 Å. The W(2)-O(7) bond length is 1.91 Å. In the third W site, W(3) is bonded in a 6-coordinate geometry to one O(10), one O(11), one O(12), one O(4), one O(6), and one O(8) atom. The W(3)-O(10) bond length is 1.72 Å. The W(3)-O(11) bond length is 1.89 Å. The W(3)-O(12) bond length is 1.95 Å. The W(3)-O(4) bond length is 1.87 Å. The W(3)-O(6) bond length is 2.32 Å. The W(3)-O(8) bond length is 1.94 Å. In the fourth W site, W(4) is bonded to one O(11), one O(13), one O(14), one O(15), and one O(16) atom to form distorted WO5 square pyramids that share  a cornercorner with one Fe(1)O6 octahedra and  an edgeedge with one W(6)O5 square pyramid. The corner-sharing octahedral tilt angles are 41°. The W(4)-O(11) bond length is 1.96 Å. The W(4)-O(13) bond length is 1.81 Å. The W(4)-O(14) bond length is 1.95 Å. The W(4)-O(15) bond length is 1.97 Å. The W(4)-O(16) bond length is 2.28 Å. In the fifth W site, W(5) is bonded in a 6-coordinate geometry to one O(12), one O(15), one O(16), one O(17), one O(18), and one O(19) atom. The W(5)-O(12) bond length is 1.89 Å. The W(5)-O(15) bond length is 1.93 Å. The W(5)-O(16) bond length is 2.30 Å. The W(5)-O(17) bond length is 1.73 Å. The W(5)-O(18) bond length is 1.89 Å. The W(5)-O(19) bond length is 1.92 Å. In the sixth W site, W(6) is bonded to one O(14), one O(16), one O(19), one O(20), and one O(21) atom to form distorted WO5 square pyramids that share  a cornercorner with one Fe(2)O6 octahedra and  an edgeedge with one W(4)O5 square pyramid. The corner-sharing octahedral tilt angles are 44°. The W(6)-O(14) bond length is 1.94 Å. The W(6)-O(16) bond length is 2.25 Å. The W(6)-O(19) bond length is 1.99 Å. The W(6)-O(20) bond length is 1.84 Å. The W(6)-O(21) bond length is 1.92 Å. In the seventh W site, W(7) is bonded in a 6-coordinate geometry to one O(21), one O(22), one O(23), one O(24), one O(25), and one O(26) atom. The W(7)-O(21) bond length is 1.94 Å. The W(7)-O(22) bond length is 1.73 Å. The W(7)-O(23) bond length is 1.85 Å. The W(7)-O(24) bond length is 1.96 Å. The W(7)-O(25) bond length is 1.94 Å. The W(7)-O(26) bond length is 2.27 Å. In the eighth W site, W(8) is bonded to one O(18), one O(24), one O(26), one O(27), and one O(9) atom to form distorted edge-sharing WO5 square pyramids. The W(8)-O(18) bond length is 1.93 Å. The W(8)-O(24) bond length is 1.94 Å. The W(8)-O(26) bond length is 2.29 Å. The W(8)-O(27) bond length is 1.91 Å. The W(8)-O(9) bond length is 1.87 Å. In the ninth W site, W(9) is bonded to one O(25), one O(26), one O(27), one O(28), and one O(7) atom to form distorted WO5 square pyramids that share  a cornercorner with one Fe(1)O6 octahedra and  an edgeedge with one W(8)O5 square pyramid. The corner-sharing octahedral tilt angles are 39°. The W(9)-O(25) bond length is 1.93 Å. The W(9)-O(26) bond length is 2.27 Å. The W(9)-O(27) bond length is 1.97 Å. The W(9)-O(28) bond length is 1.80 Å. The W(9)-O(7) bond length is 1.94 Å. There are two inequivalent Fe sites. In the first Fe site, Fe(1) is bonded to one O(13), one O(2), one O(28), one O(29), one O(3), and one O(30) atom to form FeO6 octahedra that share  a cornercorner with one W(4)O5 square pyramid and  a cornercorner with one W(9)O5 square pyramid. The Fe(1)-O(13) bond length is 1.96 Å. The Fe(1)-O(2) bond length is 1.95 Å. The Fe(1)-O(28) bond length is 1.97 Å. The Fe(1)-O(29) bond length is 2.05 Å. The Fe(1)-O(3) bond length is 1.97 Å. The Fe(1)-O(30) bond length is 2.08 Å. In the second Fe site, Fe(2) is bonded to one O(1), one O(20), one O(23), one O(31), one O(32), and one O(33) atom to form FeO6 octahedra that share  a cornercorner with one W(6)O5 square pyramid and  a cornercorner with one Na(3)O4 trigonal pyramid. The Fe(2)-O(1) bond length is 1.99 Å. The Fe(2)-O(20) bond length is 1.96 Å. The Fe(2)-O(23) bond length is 1.94 Å. The Fe(2)-O(31) bond length is 2.04 Å. The Fe(2)-O(32) bond length is 2.05 Å. The Fe(2)-O(33) bond length is 2.12 Å. There are four inequivalent C sites. In the first C site, C(1) is bonded in a distorted bent 120 degrees geometry to one O(30) and one O(36) atom. The C(1)-O(30) bond length is 1.29 Å. The C(1)-O(36) bond length is 1.23 Å. In the second C site, C(2) is bonded in a distorted bent 120 degrees geometry to one O(29) and one O(35) atom. The C(2)-O(29) bond length is 1.27 Å. The C(2)-O(35) bond length is 1.24 Å. In the third C site, C(3) is bonded in a distorted bent 120 degrees geometry to one O(31) and one O(37) atom. The C(3)-O(31) bond length is 1.27 Å. The C(3)-O(37) bond length is 1.23 Å. In the fourth C site, C(4) is bonded in a distorted bent 120 degrees geometry to one O(32) and one O(34) atom. The C(4)-O(32) bond length is 1.29 Å. The C(4)-O(34) bond length is 1.23 Å. Sb(1) is bonded in a distorted T-shaped geometry to one O(16), one O(26), and one O(6) atom. The Sb(1)-O(16) bond length is 2.00 Å. The Sb(1)-O(26) bond length is 1.99 Å. The Sb(1)-O(6) bond length is 2.00 Å. There are forty-three inequivalent O sites. In the first O site, O(1) is bonded in a linear geometry to one W(1) and one Fe(2) atom. In the second O site, O(2) is bonded in a linear geometry to one W(1) and one Fe(1) atom. In the third O site, O(3) is bonded in a linear geometry to one W(1) and one Fe(1) atom. In the fourth O site, O(4) is bonded in a trigonal planar geometry to one Na(1), one W(1), and one W(3) atom. In the fifth O site, O(5) is bonded in a distorted trigonal planar geometry to one Na(3), one W(1), and one W(2) atom. In the sixth O site, O(6) is bonded in a distorted rectangular see-saw-like geometry to one W(1), one W(2), one W(3), and one Sb(1) atom. In the seventh O site, O(7) is bonded in a bent 150 degrees geometry to one W(2) and one W(9) 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 single-bond geometry to one W(8) atom. In the tenth O site, O(10) is bonded in a bent 150 degrees geometry to one Na(4) and one W(3) atom. In the eleventh O site, O(11) is bonded in a bent 150 degrees geometry to one W(3) and one W(4) atom. In the twelfth O site, O(12) is bonded in a bent 150 degrees geometry to one W(3) and one W(5) atom. In the thirteenth O site, O(13) is bonded in a bent 150 degrees geometry to one W(4) and one Fe(1) atom. In the fourteenth O site, O(14) is bonded in a bent 120 degrees geometry to one W(4) and one W(6) atom. In the fifteenth O site, O(15) is bonded in a bent 120 degrees geometry to one W(4) and one W(5) atom. In the sixteenth O site, O(16) is bonded in a distorted rectangular see-saw-like geometry to one W(4), one W(5), one W(6), and one Sb(1) atom. In the seventeenth O site, O(17) is bonded in a 3-coordinate geometry to two equivalent Na(5) and one W(5) atom. In the eighteenth O site, O(18) is bonded in a bent 150 degrees geometry to one W(5) and one W(8) atom. In the nineteenth O site, O(19) is bonded in a bent 120 degrees geometry to one W(5) and one W(6) atom. In the twentieth O site, O(20) is bonded in a distorted bent 150 degrees geometry to one W(6) and one Fe(2) atom. In the twenty-first O site, O(21) is bonded in a bent 150 degrees geometry to one W(6) and one W(7) atom. In the twenty-second O site, O(22) is bonded in a distorted bent 120 degrees geometry to one Na(4) and one W(7) atom. In the twenty-third O site, O(23) is bonded in a bent 150 degrees geometry to one W(7) and one Fe(2) atom. In the twenty-fourth O site, O(24) is bonded in a distorted single-bond geometry to one W(7) and one W(8) atom. In the twenty-fifth O site, O(25) is bonded in a bent 120 degrees geometry to one W(7) and one W(9) atom. In the twenty-sixth O site, O(26) is bonded in a distorted rectangular see-saw-like geometry to one W(7), one W(8), one W(9), and one Sb(1) atom. In the twenty-seventh O site, O(27) is bonded in a single-bond geometry to one W(8) and one W(9) atom. In the twenty-eighth O site, O(28) is bonded in a bent 150 degrees geometry to one W(9) and one Fe(1) atom. In the twenty-ninth O site, O(29) is bonded in a bent 120 degrees geometry to one Fe(1) and one C(2) atom. In the thirtieth O site, O(30) is bonded in a bent 120 degrees geometry to one Fe(1) and one C(1) atom. In the thirty-first O site, O(31) is bonded in a bent 120 degrees geometry to one Fe(2) and one C(3) atom. In the thirty-second O site, O(32) is bonded in a distorted trigonal planar geometry to one Na(3), one Fe(2), and one C(4) atom. In the thirty-third O site, O(33) is bonded in a bent 120 degrees geometry to one Na(1) and one Fe(2) atom. In the thirty-fourth O site, O(34) is bonded in a 3-coordinate geometry to two equivalent Na(2) and one C(4) atom. In the thirty-fifth O site, O(35) is bonded in a bent 120 degrees geometry to one Na(2) and one C(2) atom. In the thirty-sixth O site, O(36) is bonded in a bent 120 degrees geometry to one Na(2) and one C(1) atom. In the thirty-seventh O site, O(37) is bonded in a 3-coordinate geometry to one Na(2), one Na(6), and one C(3) atom. In the thirty-eighth O site, O(38) is bonded in a water-like geometry to two equivalent Na(1) atoms. In the thirty-ninth O site, O(39) is bonded in an L-shaped geometry to one Na(3) and one Na(7) atom. In the fortieth O site, O(40) is bonded in a distorted L-shaped geometry to one Na(4) and one Na(5) atom. In the forty-first O site, O(41) is bonded in an L-shaped geometry to one Na(4) and one Na(5) atom. In the forty-second O site, O(42) is bonded in a water-like geometry to one Na(3) and one Na(7) atom. In the forty-third O site, O(43) is bonded in an L-shaped geometry to one Na(2) and one Na(6) atom. Linkers: 4 [O]C(=O)C([O])=O. Metal clusters: 13 [Na] ,4 [Fe] ,18 [W]. The MOF has largest included sphere 6.60 A, density 2.75 g/cm3, surface area 1478.04 m2/g, accessible volume 0.16 cm3/g