CaC14H6(SO4)2 crystallizes in the monoclinic P2_1/c space group. Ca(1) is bonded in an octahedral geometry to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms. Both Ca(1)-O(1) bond lengths are 2.35 Å. Both Ca(1)-O(2) bond lengths are 2.29 Å. Both Ca(1)-O(3) bond lengths are 2.34 Å. There are seven inequivalent C sites. In the first C site, C(6) is bonded in a distorted single-bond geometry to one C(1), one C(5), and one H(3) atom. The C(6)-C(1) bond length is 1.39 Å. The C(6)-C(5) bond length is 1.40 Å. The C(6)-H(3) bond length is 1.09 Å. In the second C site, C(7) is bonded in a single-bond geometry to one C(4), one C(5), and one O(4) atom. The C(7)-C(4) bond length is 1.48 Å. The C(7)-C(5) bond length is 1.49 Å. The C(7)-O(4) bond length is 1.24 Å. In the third C site, C(1) is bonded in a trigonal planar geometry to one C(2), one C(6), and one S(1) atom. The C(1)-C(2) bond length is 1.40 Å. The C(1)-S(1) bond length is 1.78 Å. In the fourth C site, C(2) is bonded in a distorted single-bond geometry to one C(1) and one H(1) atom. The C(2)-H(1) bond length is 1.09 Å. In the fifth C site, C(3) is bonded in a distorted single-bond geometry to one C(4) and one H(2) atom. The C(3)-C(4) bond length is 1.40 Å. The C(3)-H(2) bond length is 1.09 Å. In the sixth C site, C(4) is bonded in a trigonal planar geometry to one C(3), one C(5), and one C(7) atom. The C(4)-C(5) bond length is 1.41 Å. In the seventh C site, C(5) is bonded in a trigonal planar geometry to one C(4), one C(6), and one C(7) atom. There are three 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(3) atom. In the third H site, H(3) is bonded in a single-bond geometry to one C(6) atom. S(1) is bonded in a distorted trigonal non-coplanar geometry to one C(1), one O(1), one O(2), and one O(3) atom. The S(1)-O(1) bond length is 1.47 Å. The S(1)-O(2) bond length is 1.46 Å. The S(1)-O(3) bond length is 1.47 Å. There are four inequivalent O sites. In the first O site, O(4) is bonded in a single-bond geometry to one C(7) atom. In the second O site, O(1) is bonded in a bent 150 degrees geometry to one Ca(1) and one S(1) atom. In the third O site, O(2) is bonded in a linear geometry to one Ca(1) and one S(1) atom. In the fourth O site, O(3) is bonded in a distorted bent 120 degrees geometry to one Ca(1) and one S(1) atom. Linkers: 2 [O]S([O])([O])c1ccc2c(c1)C(=O)c1ccc(S([O])([O])[O])cc1C2=O. Metal clusters: 2 [Ca]. RCSR code: cds. The MOF has largest included sphere 1.94 A, density 1.82 g/cm3, surface area 3568.95 m2/g, accessible volume 0.09 cm3/g