Yb2C11NHO12 crystallizes in the triclinic P-1 space group. There are two inequivalent Yb sites. In the first Yb site, Yb(1) is bonded in a 7-coordinate geometry to one N(1), one O(1), one O(10), one O(5), one O(6), one O(8), and one O(9) atom. The Yb(1)-N(1) bond length is 2.43 Å. The Yb(1)-O(1) bond length is 2.37 Å. The Yb(1)-O(10) bond length is 2.33 Å. The Yb(1)-O(5) bond length is 2.29 Å. The Yb(1)-O(6) bond length is 2.38 Å. The Yb(1)-O(8) bond length is 2.34 Å. The Yb(1)-O(9) bond length is 2.34 Å. In the second Yb site, Yb(2) is bonded in a distorted trigonal pyramidal geometry to one O(11), one O(12), one O(3), and one O(4) atom. The Yb(2)-O(11) bond length is 2.33 Å. The Yb(2)-O(12) bond length is 2.37 Å. The Yb(2)-O(3) bond length is 2.26 Å. The Yb(2)-O(4) bond length is 2.23 Å. There are eleven inequivalent C sites. In the first C site, C(1) is bonded in a distorted bent 120 degrees geometry to one O(1) and one O(2) atom. The C(1)-O(1) bond length is 1.27 Å. The C(1)-O(2) bond length is 1.23 Å. In the second C site, C(2) is bonded in a distorted single-bond geometry to one C(3) and one N(1) atom. The C(2)-C(3) bond length is 1.39 Å. The C(2)-N(1) bond length is 1.34 Å. In the third C site, C(3) is bonded in a trigonal planar geometry to one C(2), one C(4), and one C(8) atom. The C(3)-C(4) bond length is 1.41 Å. The C(3)-C(8) bond length is 1.50 Å. In the fourth C site, C(4) is bonded in a distorted single-bond geometry to one C(3), one C(5), and one H(1) atom. The C(4)-C(5) bond length is 1.39 Å. The C(4)-H(1) bond length is 0.93 Å. In the fifth C site, C(5) is bonded in a trigonal planar geometry to one C(4), one C(6), and one C(9) atom. The C(5)-C(6) bond length is 1.39 Å. The C(5)-C(9) bond length is 1.50 Å. In the sixth C site, C(6) is bonded in a distorted single-bond geometry to one C(5) and one N(1) atom. The C(6)-N(1) bond length is 1.34 Å. In the seventh C site, C(7) is bonded in a distorted bent 120 degrees geometry to one O(7) and one O(8) atom. The C(7)-O(7) bond length is 1.24 Å. The C(7)-O(8) bond length is 1.26 Å. In the eighth C site, C(8) is bonded in a distorted bent 120 degrees geometry to one C(3), one O(3), and one O(4) atom. The C(8)-O(3) bond length is 1.23 Å. The C(8)-O(4) bond length is 1.26 Å. In the ninth C site, C(9) is bonded in a distorted bent 120 degrees geometry to one C(5), one O(5), and one O(6) atom. The C(9)-O(5) bond length is 1.25 Å. The C(9)-O(6) bond length is 1.26 Å. In the tenth C site, C(10) is bonded in a distorted bent 120 degrees geometry to one O(10) and one O(9) atom. The C(10)-O(10) bond length is 1.26 Å. The C(10)-O(9) bond length is 1.23 Å. In the eleventh C site, C(11) is bonded in a distorted bent 120 degrees geometry to one O(11) and one O(12) atom. The C(11)-O(11) bond length is 1.27 Å. The C(11)-O(12) bond length is 1.25 Å. N(1) is bonded in a trigonal planar geometry to one Yb(1), one C(2), and one C(6) atom. H(1) is bonded in a single-bond geometry to one C(4) atom. There are twelve inequivalent O sites. In the first O site, O(1) is bonded in a bent 120 degrees geometry to one Yb(1) and one C(1) atom. In the second O site, O(2) is bonded in a single-bond geometry to one C(1) atom. In the third O site, O(3) is bonded in a distorted bent 150 degrees geometry to one Yb(2) and one C(8) atom. In the fourth O site, O(4) is bonded in a distorted bent 150 degrees geometry to one Yb(2) and one C(8) atom. In the fifth O site, O(5) is bonded in a distorted bent 150 degrees geometry to one Yb(1) and one C(9) atom. In the sixth O site, O(6) is bonded in a distorted water-like geometry to one Yb(1) and one C(9) atom. In the seventh O site, O(7) is bonded in a single-bond geometry to one C(7) atom. In the eighth O site, O(8) is bonded in a bent 120 degrees geometry to one Yb(1) and one C(7) atom. In the ninth O site, O(9) is bonded in a bent 120 degrees geometry to one Yb(1) and one C(10) atom. In the tenth O site, O(10) is bonded in a bent 120 degrees geometry to one Yb(1) and one C(10) atom. In the eleventh O site, O(11) is bonded in a bent 120 degrees geometry to one Yb(2) and one C(11) atom. In the twelfth O site, O(12) is bonded in a bent 120 degrees geometry to one Yb(2) and one C(11) atom. Linkers: 2 [O]C(=O)C([O])=O ,2 [O]C(=O)c1cc(C([O])=O)c(C([O])=O)nc1C([O])=O. Metal clusters: 4 [Yb]. RCSR code: bex. The MOF has largest included sphere 4.41 A, density 1.98 g/cm3, surface area 2303.28 m2/g, accessible volume 0.25 cm3/g