Na3B5CH2O11 crystallizes in the monoclinic P2_1 space group. There are three inequivalent Na sites. In the first Na site, Na(1) is bonded in a 7-coordinate geometry to one O(1), one O(10), one O(11), one O(2), one O(3), one O(4), and one O(8) atom. The Na(1)-O(1) bond length is 2.81 Å. The Na(1)-O(10) bond length is 2.33 Å. The Na(1)-O(11) bond length is 2.34 Å. The Na(1)-O(2) bond length is 2.57 Å. The Na(1)-O(3) bond length is 2.50 Å. The Na(1)-O(4) bond length is 2.52 Å. The Na(1)-O(8) bond length is 2.47 Å. In the second Na site, Na(2) is bonded in a 7-coordinate geometry to one O(1), one O(10), one O(11), one O(2), one O(5), one O(6), and one O(8) atom. The Na(2)-O(1) bond length is 2.79 Å. The Na(2)-O(10) bond length is 2.39 Å. The Na(2)-O(11) bond length is 2.40 Å. The Na(2)-O(2) bond length is 2.61 Å. The Na(2)-O(5) bond length is 2.45 Å. The Na(2)-O(6) bond length is 2.49 Å. The Na(2)-O(8) bond length is 2.50 Å. In the third Na site, Na(3) is bonded in a 10-coordinate geometry to one H(1), one H(2), one O(1), one O(10), one O(3), one O(4), one O(5), one O(6), one O(7), and one O(9) atom. The Na(3)-H(1) bond length is 2.63 Å. The Na(3)-H(2) bond length is 2.66 Å. The Na(3)-O(1) bond length is 2.92 Å. The Na(3)-O(10) bond length is 2.34 Å. The Na(3)-O(3) bond length is 2.51 Å. The Na(3)-O(4) bond length is 2.78 Å. The Na(3)-O(5) bond length is 2.73 Å. The Na(3)-O(6) bond length is 2.49 Å. The Na(3)-O(7) bond length is 2.78 Å. The Na(3)-O(9) bond length is 2.79 Å. There are five inequivalent B sites. In the first B site, B(1) is bonded to one O(3), one O(6), one O(7), and one O(8) atom to form corner-sharing BO4 tetrahedra. The B(1)-O(3) bond length is 1.49 Å. The B(1)-O(6) bond length is 1.48 Å. The B(1)-O(7) bond length is 1.45 Å. The B(1)-O(8) bond length is 1.49 Å. In the second B site, B(2) is bonded in a trigonal planar geometry to one O(3), one O(4), and one O(5) atom. The B(2)-O(3) bond length is 1.36 Å. The B(2)-O(4) bond length is 1.40 Å. The B(2)-O(5) bond length is 1.38 Å. In the third B site, B(3) is bonded to one O(2), one O(5), one O(7), and one O(9) atom to form corner-sharing BO4 tetrahedra. The B(3)-O(2) bond length is 1.50 Å. The B(3)-O(5) bond length is 1.48 Å. The B(3)-O(7) bond length is 1.46 Å. The B(3)-O(9) bond length is 1.48 Å. In the fourth B site, B(4) is bonded in a trigonal planar geometry to one O(4), one O(6), and one O(9) atom. The B(4)-O(4) bond length is 1.42 Å. The B(4)-O(6) bond length is 1.37 Å. The B(4)-O(9) bond length is 1.35 Å. In the fifth B site, B(5) is bonded in a trigonal planar geometry to one O(1), one O(2), and one O(8) atom. The B(5)-O(1) bond length is 1.38 Å. The B(5)-O(2) bond length is 1.37 Å. The B(5)-O(8) bond length is 1.38 Å. C(1) is bonded in a trigonal planar geometry to one H(2), one O(10), and one O(11) atom. The C(1)-H(2) bond length is 1.11 Å. The C(1)-O(10) bond length is 1.27 Å. The C(1)-O(11) bond length is 1.27 Å. There are two inequivalent H sites. In the first H site, H(1) is bonded in a 2-coordinate geometry to one Na(3), one O(1), and one O(7) atom. The H(1)-O(1) bond length is 1.01 Å. The H(1)-O(7) bond length is 1.61 Å. In the second H site, H(2) is bonded in a single-bond geometry to one Na(3) and one C(1) atom. There are eleven inequivalent O sites. In the first O site, O(1) is bonded in a bent 120 degrees geometry to one Na(1), one Na(2), one Na(3), one B(5), and one H(1) atom. In the second O site, O(2) is bonded in a distorted bent 120 degrees geometry to one Na(1), one Na(2), one B(3), and one B(5) atom. In the third O site, O(3) is bonded in a distorted bent 120 degrees geometry to one Na(1), one Na(3), one B(1), and one B(2) atom. In the fourth O site, O(4) is bonded in a distorted bent 120 degrees geometry to one Na(1), one Na(3), one B(2), and one B(4) atom. In the fifth O site, O(5) is bonded in a distorted bent 120 degrees geometry to one Na(2), one Na(3), one B(2), and one B(3) atom. In the sixth O site, O(6) is bonded in a distorted bent 120 degrees geometry to one Na(2), one Na(3), one B(1), and one B(4) atom. In the seventh O site, O(7) is bonded in a 3-coordinate geometry to one Na(3), one B(1), one B(3), and one H(1) atom. In the eighth O site, O(8) is bonded in a distorted bent 120 degrees geometry to one Na(1), one Na(2), one B(1), and one B(5) atom. In the ninth O site, O(9) is bonded in a bent 120 degrees geometry to one Na(3), one B(3), and one B(4) atom. In the tenth O site, O(10) is bonded in a 4-coordinate geometry to one Na(1), one Na(2), one Na(3), and one C(1) atom. In the eleventh O site, O(11) is bonded in a 3-coordinate geometry to one Na(1), one Na(2), and one C(1) atom. Linkers: 1 [B].[B].[B].[B].[B].[B].[B].[B].[B].[B].[B].[B].[B].[B].[B].[B].[B].[B].[B].[B].[B].[B].[B].[B].[B].[B].[B].[B].[B].[B].[B].[B].[B].[B].[B].[B]=O.[B]=O.[B]=O.[B]=O.[B]=O.[B]O[B][O].[B][O].[B][O].[B][O].[H].[H].[H].[H].[H].[H].[H].[OH].[OH].[O].[O].[O].[O].[O].[O].[O].[O].[O].[O].[O].[O].[O].[O].[O].[O].[O].[O].[O].[O].[O].[O].[O].[O].[O].[O].[O].[O].[O].[O].[O].[O].[O].[O].[O].[O].[O].[O].[O].[O].[O].[O].[O].[O].[O].[O].[O].[O].[O].[O].[O].[O].[O].[O].[O].[O].[O].[O].[O].[O].[O].[O].[O].[O].[O].[O].[O]B=O.[O][B][O].[O][B][O] ,1 [B].[B].[B].[B].[B].[B].[B].[B].[B].[B].[B].[B].[B].[B].[B].[B].[B].[B].[B].[B].[B].[B].[B].[B].[B].[B].[B].[B].[B].[B].[B].[B].[B].[B].[B]=O.[B]=O.[B]=O.[B]=O.[B]=O.[B]=O.[B]=O.[B]=O.[B]OB([O])[O].[B][O].[B][O].[B][O].[H].[H].[H].[H].[H].[H].[H].[H].[OH].[O].[O].[O].[O].[O].[O].[O].[O].[O].[O].[O].[O].[O].[O].[O].[O].[O].[O].[O].[O].[O].[O].[O].[O].[O].[O].[O].[O].[O].[O].[O].[O].[O].[O].[O].[O].[O].[O].[O].[O].[O].[O].[O].[O].[O].[O].[O].[O].[O].[O].[O].[O].[O].[O].[O].[O].[O].[O].[O].[O].[O].[O].[O].[O].[O].[O].[O].[O][B][O] ,2 [O]C=O. Metal clusters: 6 [Na]. The MOF has largest included sphere 0.78 A, density 2.36 g/cm3, surface area 0.00 m2/g, accessible volume 0.00 cm3/g