LaCH3SO7 crystallizes in the monoclinic P2_1 space group. There are two inequivalent La sites. In the first La site, La(1) is bonded in a 9-coordinate geometry to one O(1), one O(10), one O(11), one O(12), one O(13), one O(4), one O(5), one O(8), and one O(9) atom. The La(1)-O(1) bond length is 2.50 Å. The La(1)-O(10) bond length is 2.85 Å. The La(1)-O(11) bond length is 2.59 Å. The La(1)-O(12) bond length is 2.70 Å. The La(1)-O(13) bond length is 2.50 Å. The La(1)-O(4) bond length is 2.56 Å. The La(1)-O(5) bond length is 2.40 Å. The La(1)-O(8) bond length is 2.59 Å. The La(1)-O(9) bond length is 2.59 Å. In the second La site, La(2) is bonded in a 9-coordinate geometry to one O(10), one O(11), one O(12), one O(14), one O(2), one O(3), one O(6), one O(7), and one O(9) atom. The La(2)-O(10) bond length is 2.59 Å. The La(2)-O(11) bond length is 2.70 Å. The La(2)-O(12) bond length is 2.59 Å. The La(2)-O(14) bond length is 2.51 Å. The La(2)-O(2) bond length is 2.50 Å. The La(2)-O(3) bond length is 2.56 Å. The La(2)-O(6) bond length is 2.40 Å. The La(2)-O(7) bond length is 2.59 Å. The La(2)-O(9) bond length is 2.85 Å. C(1,2) is bonded in a trigonal planar geometry to one H(1), one O(11), and one O(9) atom. The C(1,2)-H(1) bond length is 1.10 Å. The C(1,2)-O(11) bond length is 1.28 Å. The C(1,2)-O(9) bond length is 1.27 Å. There are six inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one C(1,2) atom. In the second H site, H(2) is bonded in a single-bond geometry to one C(1,2) atom. The H(2)-C(1,2) bond length is 1.10 Å. In the third H site, H(3) is bonded in a single-bond geometry to one O(13) atom. The H(3)-O(13) bond length is 0.98 Å. In the fourth H site, H(4) is bonded in a single-bond geometry to one O(14) atom. The H(4)-O(14) bond length is 0.98 Å. In the fifth H site, H(5) is bonded in a distorted single-bond geometry to one O(13) and one O(3) atom. The H(5)-O(13) bond length is 0.99 Å. The H(5)-O(3) bond length is 1.70 Å. In the sixth H site, H(6) is bonded in a distorted single-bond geometry to one O(14) and one O(4) atom. The H(6)-O(14) bond length is 0.99 Å. The H(6)-O(4) bond length is 1.70 Å. There are two inequivalent S sites. In the first S site, S(1) is bonded in a tetrahedral geometry to one O(1), one O(3), one O(5), and one O(7) atom. The S(1)-O(1) bond length is 1.48 Å. The S(1)-O(3) bond length is 1.50 Å. The S(1)-O(5) bond length is 1.48 Å. The S(1)-O(7) bond length is 1.49 Å. In the second S site, S(2) is bonded in a tetrahedral geometry to one O(2), one O(4), one O(6), and one O(8) atom. The S(2)-O(2) bond length is 1.48 Å. The S(2)-O(4) bond length is 1.50 Å. The S(2)-O(6) bond length is 1.48 Å. The S(2)-O(8) bond length is 1.49 Å. There are fourteen inequivalent O sites. In the first O site, O(1) is bonded in a distorted bent 150 degrees geometry to one La(1) and one S(1) atom. In the second O site, O(2) is bonded in a distorted bent 150 degrees geometry to one La(2) and one S(2) atom. In the third O site, O(3) is bonded in a 3-coordinate geometry to one La(2), one H(5), and one S(1) atom. In the fourth O site, O(4) is bonded in a 3-coordinate geometry to one La(1), one H(6), and one S(2) atom. In the fifth O site, O(5) is bonded in a distorted linear geometry to one La(1) and one S(1) atom. In the sixth O site, O(6) is bonded in a distorted linear geometry to one La(2) and one S(2) atom. In the seventh O site, O(7) is bonded in a distorted bent 120 degrees geometry to one La(2) and one S(1) atom. In the eighth O site, O(8) is bonded in a distorted bent 120 degrees geometry to one La(1) and one S(2) atom. In the ninth O site, O(9) is bonded in a distorted single-bond geometry to one La(1); one La(2); and one C(1,2) atom. In the tenth O site, O(10) is bonded in a distorted single-bond geometry to one La(1); one La(2); and one C(1,2) atom. The O(10)-C(1,2) bond length is 1.27 Å. In the eleventh O site, O(11) is bonded in a distorted single-bond geometry to one La(1); one La(2); and one C(1,2) atom. In the twelfth O site, O(12) is bonded in a distorted single-bond geometry to one La(1); one La(2); and one C(1,2) atom. The O(12)-C(1,2) bond length is 1.28 Å. In the thirteenth O site, O(13) is bonded in a water-like geometry to one La(1), one H(3), and one H(5) atom. In the fourteenth O site, O(14) is bonded in a water-like geometry to one La(2), one H(4), and one H(6) atom. Linkers: 4 [O]C=O ,4 [O]S([O])(=O)=O. Metal clusters: 4 [La]. The MOF has largest included sphere 1.42 A, density 3.41 g/cm3, surface area 1624.91 m2/g, accessible volume 0.03 cm3/g