Na3YC12H20O19 crystallizes in the monoclinic C2/c space group. There are two inequivalent Na sites. In the first Na site, Na(1) is bonded to one O(10), one O(6), one O(8), one O(9), and two equivalent O(3) atoms to form a mixture of distorted face and edge-sharing NaO6 octahedra. The Na(1)-O(10) bond length is 2.52 Å. The Na(1)-O(6) bond length is 2.65 Å. The Na(1)-O(8) bond length is 2.33 Å. The Na(1)-O(9) bond length is 2.46 Å. There is one shorter (2.32 Å) and one longer (2.53 Å) Na(1)-O(3) bond length. In the second Na site, Na(2) is bonded to two equivalent O(10), two equivalent O(6), and two equivalent O(9) atoms to form distorted face-sharing NaO6 octahedra. Both Na(2)-O(10) bond lengths are 2.43 Å. Both Na(2)-O(6) bond lengths are 2.37 Å. Both Na(2)-O(9) bond lengths are 2.35 Å. Y(1) is bonded in a 9-coordinate geometry to one O(1), two equivalent O(2), two equivalent O(4), two equivalent O(5), and two equivalent O(7) atoms. The Y(1)-O(1) bond length is 2.43 Å. Both Y(1)-O(2) bond lengths are 2.31 Å. Both Y(1)-O(4) bond lengths are 2.52 Å. Both Y(1)-O(5) bond lengths are 2.38 Å. Both Y(1)-O(7) bond lengths are 2.38 Å. There are six inequivalent C sites. In the first C site, C(1) is bonded in a distorted trigonal non-coplanar geometry to one H(1), one H(2), and one O(1) atom. The C(1)-H(1) bond length is 1.11 Å. The C(1)-H(2) bond length is 1.10 Å. The C(1)-O(1) bond length is 1.43 Å. In the second C site, C(2) is bonded in a distorted bent 120 degrees geometry to one O(2) and one O(3) atom. The C(2)-O(2) bond length is 1.28 Å. The C(2)-O(3) bond length is 1.25 Å. In the third C site, C(3) is bonded in a distorted trigonal non-coplanar geometry to one H(3), one H(4), and one O(4) atom. The C(3)-H(3) bond length is 1.10 Å. The C(3)-H(4) bond length is 1.10 Å. The C(3)-O(4) bond length is 1.43 Å. In the fourth C site, C(4) is bonded in a distorted bent 120 degrees geometry to one O(5) and one O(6) atom. The C(4)-O(5) bond length is 1.29 Å. The C(4)-O(6) bond length is 1.25 Å. In the fifth C site, C(5) is bonded in a distorted trigonal non-coplanar geometry to one H(5), one H(6), and one O(4) atom. The C(5)-H(5) bond length is 1.11 Å. The C(5)-H(6) bond length is 1.10 Å. The C(5)-O(4) bond length is 1.43 Å. In the sixth C site, C(6) is bonded in a distorted bent 120 degrees geometry to one O(7) and one O(8) atom. The C(6)-O(7) bond length is 1.29 Å. The C(6)-O(8) bond length is 1.25 Å. There are ten inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one C(1) atom. In the second H site, H(2) is bonded in a single-bond geometry to one C(1) atom. In the third H site, H(3) is bonded in a single-bond geometry to one C(3) atom. In the fourth H site, H(4) is bonded in a single-bond geometry to one C(3) atom. In the fifth H site, H(5) is bonded in a single-bond geometry to one C(5) atom. In the sixth H site, H(6) is bonded in a single-bond geometry to one C(5) atom. In the seventh H site, H(7) is bonded in a single-bond geometry to one O(9) atom. The H(7)-O(9) bond length is 0.97 Å. In the eighth H site, H(8) is bonded in a single-bond geometry to one O(5) and one O(9) atom. The H(8)-O(5) bond length is 1.74 Å. The H(8)-O(9) bond length is 1.00 Å. In the ninth H site, H(9) is bonded in a single-bond geometry to one O(10) atom. The H(9)-O(10) bond length is 1.00 Å. In the tenth H site, H(10) is bonded in a single-bond geometry to one O(10) atom. The H(10)-O(10) bond length is 0.97 Å. There are ten inequivalent O sites. In the first O site, O(1) is bonded in a distorted bent 120 degrees geometry to one Y(1) and two equivalent C(1) atoms. In the second O site, O(2) is bonded in a distorted bent 120 degrees geometry to one Y(1) and one C(2) atom. In the third O site, O(3) is bonded in a 3-coordinate geometry to two equivalent Na(1) and one C(2) atom. In the fourth O site, O(4) is bonded in a distorted bent 120 degrees geometry to one Y(1), one C(3), and one C(5) atom. In the fifth O site, O(5) is bonded in a distorted single-bond geometry to one Y(1), one C(4), and one H(8) atom. In the sixth O site, O(6) is bonded in a distorted single-bond geometry to one Na(1), one Na(2), and one C(4) atom. In the seventh O site, O(7) is bonded in a distorted single-bond geometry to one Y(1) and one C(6) atom. In the eighth O site, O(8) is bonded in a distorted bent 120 degrees geometry to one Na(1) and one C(6) atom. In the ninth O site, O(9) is bonded in a distorted water-like geometry to one Na(1), one Na(2), one H(7), and one H(8) atom. In the tenth O site, O(10) is bonded in a distorted water-like geometry to one Na(1), one Na(2), one H(10), and one H(9) atom. Linkers: 6 [O]C(=O)COCC([O])=O ,8 O. Metal clusters: 6 [Na] ,2 [Y]. The MOF has largest included sphere 3.78 A, density 1.58 g/cm3, surface area 3220.04 m2/g, accessible volume 0.21 cm3/g