Tb2C21N3H13O14 crystallizes in the monoclinic C2/c space group. Tb(1) is bonded in a 8-coordinate geometry to one O(1), one O(3), one O(4), one O(5), one O(6), one O(7), and two equivalent O(2) atoms. The Tb(1)-O(1) bond length is 2.58 Å. The Tb(1)-O(3) bond length is 2.46 Å. The Tb(1)-O(4) bond length is 2.34 Å. The Tb(1)-O(5) bond length is 2.32 Å. The Tb(1)-O(6) bond length is 2.25 Å. The Tb(1)-O(7) bond length is 2.31 Å. There is one shorter (2.39 Å) and one longer (2.48 Å) Tb(1)-O(2) bond length. There are eleven inequivalent C sites. In the first C site, C(1) is bonded in a bent 120 degrees geometry to one C(10), one O(1), and one O(2) atom. The C(1)-C(10) bond length is 1.49 Å. The C(1)-O(1) bond length is 1.25 Å. The C(1)-O(2) bond length is 1.30 Å. In the second C site, C(2) is bonded in a distorted trigonal planar geometry to one C(3), one N(2), and one H(1) atom. The C(2)-C(3) bond length is 1.40 Å. The C(2)-N(2) bond length is 1.34 Å. The C(2)-H(1) bond length is 1.09 Å. In the third C site, C(3) is bonded in a trigonal planar geometry to one C(11), one C(2), and one C(9) atom. The C(3)-C(11) bond length is 1.50 Å. The C(3)-C(9) bond length is 1.40 Å. In the fourth C site, C(4) is bonded in a distorted bent 120 degrees geometry to one C(6), one N(1), and one H(2) atom. The C(4)-C(6) bond length is 1.40 Å. The C(4)-N(1) bond length is 1.34 Å. The C(4)-H(2) bond length is 1.09 Å. In the fifth C site, C(5) is bonded in a distorted trigonal planar geometry to one C(10), one N(2), and one H(3) atom. The C(5)-C(10) bond length is 1.40 Å. The C(5)-N(2) bond length is 1.34 Å. The C(5)-H(3) bond length is 1.09 Å. In the sixth C site, C(6) is bonded in a trigonal planar geometry to one C(4), one C(7), and one C(8) atom. The C(6)-C(7) bond length is 1.50 Å. The C(6)-C(8) bond length is 1.40 Å. In the seventh C site, C(7) is bonded in a distorted bent 120 degrees geometry to one C(6), one O(3), and one O(4) atom. The C(7)-O(3) bond length is 1.27 Å. The C(7)-O(4) bond length is 1.27 Å. In the eighth C site, C(8) is bonded in a distorted single-bond geometry to two equivalent C(6) and one H(4) atom. The C(8)-H(4) bond length is 1.09 Å. In the ninth C site, C(9) is bonded in a distorted single-bond geometry to one C(10), one C(3), and one H(5) atom. The C(9)-C(10) bond length is 1.40 Å. The C(9)-H(5) bond length is 1.09 Å. In the tenth C site, C(10) is bonded in a trigonal planar geometry to one C(1), one C(5), and one C(9) atom. In the eleventh C site, C(11) is bonded in a distorted bent 120 degrees geometry to one C(3), one O(6), and one O(7) atom. The C(11)-O(6) bond length is 1.27 Å. The C(11)-O(7) bond length is 1.26 Å. There are two inequivalent N sites. In the first N site, N(1) is bonded in a bent 120 degrees geometry to two equivalent C(4) atoms. In the second N site, N(2) is bonded in a trigonal planar geometry to one C(2), one C(5), and one H(7) atom. The N(2)-H(7) bond length is 1.66 Å. There are seven inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one C(2) 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. In the fourth H site, H(4) is bonded in a single-bond geometry to one C(8) atom. In the fifth H site, H(5) is bonded in a single-bond geometry to one C(9) atom. In the sixth H site, H(6) is bonded in a single-bond geometry to one O(5) atom. The H(6)-O(5) bond length is 0.99 Å. In the seventh H site, H(7) is bonded in a distorted linear geometry to one N(2) and one O(5) atom. The H(7)-O(5) bond length is 1.02 Å. There are seven inequivalent O sites. In the first O site, O(1) is bonded in a single-bond geometry to one Tb(1) and one C(1) atom. In the second O site, O(2) is bonded in a distorted single-bond geometry to two equivalent Tb(1) and one C(1) atom. In the third O site, O(3) is bonded in a distorted single-bond geometry to one Tb(1) and one C(7) atom. In the fourth O site, O(4) is bonded in a distorted bent 120 degrees geometry to one Tb(1) and one C(7) atom. In the fifth O site, O(5) is bonded in a distorted water-like geometry to one Tb(1), one H(6), and one H(7) atom. In the sixth O site, O(6) is bonded in a distorted bent 150 degrees geometry to one Tb(1) and one C(11) atom. In the seventh O site, O(7) is bonded in a bent 150 degrees geometry to one Tb(1) and one C(11) atom. Linkers: 6 [O]C(=O)c1cncc(C([O])=O)c1. Metal clusters: 4 [Tb]. The MOF has largest included sphere 3.16 A, density 2.40 g/cm3, surface area 2638.63 m2/g, accessible volume 0.09 cm3/g