TmC8NH8O9 crystallizes in the monoclinic P2_1/c space group. Tm(1) is bonded in a 8-coordinate geometry to one N(1), one O(2), one O(3), one O(5), one O(6), one O(7), one O(8), and one O(9) atom. The Tm(1)-N(1) bond length is 2.40 Å. The Tm(1)-O(2) bond length is 2.39 Å. The Tm(1)-O(3) bond length is 2.27 Å. The Tm(1)-O(5) bond length is 2.30 Å. The Tm(1)-O(6) bond length is 2.27 Å. The Tm(1)-O(7) bond length is 2.31 Å. The Tm(1)-O(8) bond length is 2.41 Å. The Tm(1)-O(9) bond length is 2.39 Å. There are eight inequivalent C sites. In the first C site, C(1) is bonded in a distorted trigonal planar geometry to one C(5), one C(6), and one N(1) atom. The C(1)-C(5) bond length is 1.40 Å. The C(1)-C(6) bond length is 1.51 Å. The C(1)-N(1) bond length is 1.34 Å. In the second C site, C(2) is bonded in a distorted single-bond geometry to one C(3), one C(7), and one N(1) atom. The C(2)-C(3) bond length is 1.39 Å. The C(2)-C(7) bond length is 1.51 Å. The C(2)-N(1) bond length is 1.34 Å. In the third C site, C(3) is bonded in a distorted trigonal planar geometry to one C(2), one C(4), and one H(7) atom. The C(3)-C(4) bond length is 1.40 Å. The C(3)-H(7) bond length is 1.09 Å. In the fourth C site, C(4) is bonded in a trigonal planar geometry to one C(3), one C(5), and one C(8) atom. The C(4)-C(5) bond length is 1.40 Å. The C(4)-C(8) bond length is 1.50 Å. In the fifth C site, C(5) is bonded in a distorted trigonal planar geometry to one C(1), one C(4), and one H(8) atom. The C(5)-H(8) bond length is 1.09 Å. In the sixth C site, C(6) is bonded in a distorted bent 120 degrees geometry to one C(1), one O(1), and one O(2) atom. The C(6)-O(1) bond length is 1.24 Å. The C(6)-O(2) bond length is 1.31 Å. In the seventh C site, C(7) is bonded in a distorted bent 120 degrees geometry to one C(2), one O(3), and one O(4) atom. The C(7)-O(3) bond length is 1.32 Å. The C(7)-O(4) bond length is 1.23 Å. In the eighth C site, C(8) is bonded in a distorted bent 120 degrees geometry to one C(4), one O(5), and one O(6) atom. The C(8)-O(5) bond length is 1.27 Å. The C(8)-O(6) bond length is 1.27 Å. N(1) is bonded in a distorted trigonal planar geometry to one Tm(1), one C(1), and one C(2) atom. There are eight inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one O(7) atom. The H(1)-O(7) bond length is 1.00 Å. In the second H site, H(2) is bonded in a distorted single-bond geometry to one O(3) and one O(7) atom. The H(2)-O(3) bond length is 1.63 Å. The H(2)-O(7) bond length is 1.01 Å. In the third H site, H(3) is bonded in a single-bond geometry to one O(8) atom. The H(3)-O(8) bond length is 1.00 Å. In the fourth H site, H(4) is bonded in a single-bond geometry to one O(8) atom. The H(4)-O(8) bond length is 0.97 Å. In the fifth H site, H(5) is bonded in a single-bond geometry to one O(9) atom. The H(5)-O(9) bond length is 0.97 Å. In the sixth H site, H(6) is bonded in a single-bond geometry to one O(9) atom. The H(6)-O(9) bond length is 0.99 Å. In the seventh H site, H(7) is bonded in a single-bond geometry to one C(3) atom. In the eighth H site, H(8) is bonded in a single-bond geometry to one C(5) atom. There are nine inequivalent O sites. In the first O site, O(1) is bonded in a single-bond geometry to one C(6) atom. In the second O site, O(2) is bonded in a distorted single-bond geometry to one Tm(1) and one C(6) atom. In the third O site, O(3) is bonded in a trigonal planar geometry to one Tm(1), one C(7), and one H(2) atom. In the fourth O site, O(4) is bonded in a single-bond geometry to one C(7) atom. In the fifth O site, O(5) is bonded in a distorted bent 120 degrees geometry to one Tm(1) and one C(8) atom. In the sixth O site, O(6) is bonded in a distorted bent 150 degrees geometry to one Tm(1) and one C(8) atom. In the seventh O site, O(7) is bonded in a distorted water-like geometry to one Tm(1), one H(1), and one H(2) atom. In the eighth O site, O(8) is bonded in a water-like geometry to one Tm(1), one H(3), and one H(4) atom. In the ninth O site, O(9) is bonded in a distorted water-like geometry to one Tm(1), one H(5), and one H(6) atom. Linkers: 4 [O]C(=O)c1cc(C([O])=O)nc(C([O])=O)c1. Metal clusters: 4 [Tm]. The MOF has largest included sphere 3.39 A, density 2.18 g/cm3, surface area 2752.94 m2/g, accessible volume 0.16 cm3/g