Yb3W12C21N3H9O43 crystallizes in the trigonal R3c space group. Yb(1) is bonded in a 3-coordinate geometry to one O(7), one O(8), and one O(9) atom. The Yb(1)-O(7) bond length is 2.24 Å. The Yb(1)-O(8) bond length is 2.35 Å. The Yb(1)-O(9) bond length is 2.25 Å. There are four inequivalent W sites. In the first W site, W(1) is bonded to one O(11), one O(2), one O(4), and two equivalent O(13) atoms to form distorted WO5 square pyramids that share corners with two equivalent W(1)O5 square pyramids,  an edgeedge with one W(3)O6 octahedra, and  an edgeedge with one W(2)O5 square pyramid. The W(1)-O(11) bond length is 2.24 Å. The W(1)-O(2) bond length is 2.00 Å. The W(1)-O(4) bond length is 1.89 Å. There is one shorter (1.88 Å) and one longer (1.92 Å) W(1)-O(13) bond length. In the second W site, W(2) is bonded to one O(1), one O(11), one O(3), one O(4), and one O(6) atom to form distorted WO5 square pyramids that share  a cornercorner with one W(3)O6 octahedra,  a cornercorner with one W(4)O5 square pyramid,  an edgeedge with one W(3)O6 octahedra, and  an edgeedge with one W(1)O5 square pyramid. The corner-sharing octahedral tilt angles are 27°. The W(2)-O(1) bond length is 1.94 Å. The W(2)-O(11) bond length is 2.21 Å. The W(2)-O(3) bond length is 1.89 Å. The W(2)-O(4) bond length is 1.97 Å. The W(2)-O(6) bond length is 1.89 Å. In the third W site, W(3) is bonded to one O(1), one O(11), one O(14), one O(2), one O(6), and one O(8) atom to form a mixture of distorted edge and corner-sharing WO6 octahedra. The W(3)-O(1) bond length is 1.82 Å. The W(3)-O(11) bond length is 2.14 Å. The W(3)-O(14) bond length is 1.99 Å. The W(3)-O(2) bond length is 1.92 Å. The W(3)-O(6) bond length is 1.99 Å. The W(3)-O(8) bond length is 1.77 Å. In the fourth W site, W(4) is bonded to one O(14), one O(15), one O(3), and two equivalent O(5) atoms to form distorted WO5 square pyramids that share  a cornercorner with one W(3)O6 octahedra,  a cornercorner with one W(2)O5 square pyramid, and edges with two equivalent W(4)O5 square pyramids. The corner-sharing octahedral tilt angles are 30°. The W(4)-O(14) bond length is 1.81 Å. The W(4)-O(15) bond length is 2.31 Å. The W(4)-O(3) bond length is 1.91 Å. There is one shorter (1.89 Å) and one longer (2.00 Å) W(4)-O(5) bond length. There are seven inequivalent C sites. In the first C site, C(1) is bonded in a trigonal planar geometry to one C(4), one C(5), and one C(7) atom. The C(1)-C(4) bond length is 1.33 Å. The C(1)-C(5) bond length is 1.43 Å. The C(1)-C(7) bond length is 1.52 Å. In the second C site, C(2) is bonded in a trigonal planar geometry to one C(3), one C(4), and one C(6) atom. The C(2)-C(3) bond length is 1.31 Å. The C(2)-C(4) bond length is 1.38 Å. The C(2)-C(6) bond length is 1.51 Å. In the third C site, C(3) is bonded in a distorted bent 120 degrees geometry to one C(2), one N(1), and one H(1) atom. The C(3)-N(1) bond length is 1.21 Å. The C(3)-H(1) bond length is 0.96 Å. In the fourth C site, C(4) is bonded in a distorted single-bond geometry to one C(1), one C(2), and one H(2) atom. The C(4)-H(2) bond length is 0.96 Å. In the fifth C site, C(5) is bonded in a distorted bent 120 degrees geometry to one C(1), one N(1), and one H(3) atom. The C(5)-N(1) bond length is 1.42 Å. The C(5)-H(3) bond length is 0.96 Å. In the sixth C site, C(6) is bonded in a distorted bent 120 degrees geometry to one C(2), one O(12), and one O(9) atom. The C(6)-O(12) bond length is 1.30 Å. The C(6)-O(9) bond length is 1.27 Å. In the seventh C site, C(7) is bonded in a distorted bent 120 degrees geometry to one C(1), one O(10), and one O(7) atom. The C(7)-O(10) bond length is 1.27 Å. The C(7)-O(7) bond length is 1.24 Å. N(1) is bonded in a bent 120 degrees geometry to one C(3) and one C(5) atom. There are three inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one C(3) atom. In the second H site, H(2) is bonded in a single-bond geometry to one C(4) atom. In the third H site, H(3) is bonded in a single-bond geometry to one C(5) atom. There are fifteen inequivalent O sites. In the first O site, O(1) is bonded in a bent 150 degrees geometry to one W(2) and one W(3) atom. In the second O site, O(2) is bonded in a bent 120 degrees geometry to one W(1) and one W(3) atom. In the third O site, O(3) is bonded in a bent 150 degrees geometry to one W(2) and one W(4) atom. In the fourth O site, O(4) is bonded in a bent 120 degrees geometry to one W(1) and one W(2) atom. In the fifth O site, O(5) is bonded in a bent 120 degrees geometry to two equivalent W(4) atoms. In the sixth O site, O(6) is bonded in a bent 120 degrees geometry to one W(2) and one W(3) atom. In the seventh O site, O(7) is bonded in a bent 150 degrees geometry to one Yb(1) and one C(7) atom. In the eighth O site, O(8) is bonded in a bent 150 degrees geometry to one Yb(1) and one W(3) atom. In the ninth O site, O(9) is bonded in a distorted single-bond geometry to one Yb(1) and one C(6) atom. In the tenth O site, O(10) is bonded in a single-bond geometry to one C(7) atom. In the eleventh O site, O(11) is bonded in a distorted T-shaped geometry to one W(1), one W(2), and one W(3) atom. In the twelfth O site, O(12) is bonded in a single-bond geometry to one C(6) atom. In the thirteenth O site, O(13) is bonded in a bent 150 degrees geometry to two equivalent W(1) atoms. In the fourteenth O site, O(14) is bonded in a bent 150 degrees geometry to one W(3) and one W(4) atom. In the fifteenth O site, O(15) is bonded in a distorted T-shaped geometry to three equivalent W(4) atoms. Linkers: 18 [O]C(=O)c1cncc(C([O])=O)c1. Metal clusters: 3 [O][C]O[Yb](O[C]=O)O[W]1234O[W]567O[W]89(O[Yb](O[C][O])O[C]=O)(O5)O[W]5%10%11O[W]%12%13(O[Yb](O[C][O])O[C]=O)(O[W](O1)(O2)(O[W@]1(O3)O[W@@](O6)(O8)O[W@@](O5)(O%12)O1)O[W@@]1(O%13)O[W@](O7)(O4)O[W@](O%10)(O9)O1)O%11 ,3 [O][C]O[Yb](O[C]=O)O[W]1234O[W]56(O1)O[W]178(O[Yb](O[C][O])O[C]=O)O[W]9%10(O1)O[W]1%11%12(O[Yb](O[C][O])O[C]=O)O[W](O2)(O1)(O[W@]1(O3)O[W@@](O5)(O7)O[W@@](O9)(O%11)O1)O[W@@]1(O%12)O[W@](O6)(O4)O[W@](O%10)(O8)O1. RCSR code: pcu. The MOF has largest included sphere 6.92 A, density 3.00 g/cm3, surface area 1526.99 m2/g, accessible volume 0.17 cm3/g