Pr2C4H8S2O15 crystallizes in the triclinic P-1 space group. There are two inequivalent Pr sites. In the first Pr site, Pr(1) is bonded in a 10-coordinate geometry to one O(10), one O(14), one O(2), one O(3), one O(4), one O(6), one O(7), one O(8), and two equivalent O(1) atoms. The Pr(1)-O(10) bond length is 2.62 Å. The Pr(1)-O(14) bond length is 2.45 Å. The Pr(1)-O(2) bond length is 2.65 Å. The Pr(1)-O(3) bond length is 2.61 Å. The Pr(1)-O(4) bond length is 2.56 Å. The Pr(1)-O(6) bond length is 2.55 Å. The Pr(1)-O(7) bond length is 2.60 Å. The Pr(1)-O(8) bond length is 2.45 Å. There is one shorter (2.54 Å) and one longer (2.65 Å) Pr(1)-O(1) bond length. In the second Pr site, Pr(2) is bonded in a 9-coordinate geometry to one O(12), one O(13), one O(15), one O(4), one O(9), two equivalent O(11), and two equivalent O(5) atoms. The Pr(2)-O(12) bond length is 2.57 Å. The Pr(2)-O(13) bond length is 2.45 Å. The Pr(2)-O(15) bond length is 2.49 Å. The Pr(2)-O(4) bond length is 2.70 Å. The Pr(2)-O(9) bond length is 2.42 Å. There is one shorter (2.48 Å) and one longer (2.61 Å) Pr(2)-O(11) bond length. There is one shorter (2.50 Å) and one longer (2.61 Å) Pr(2)-O(5) bond length. There are four inequivalent C sites. In the first C site, C(1) is bonded in a distorted bent 120 degrees geometry to one O(1) and one O(2) atom. The C(1)-O(1) bond length is 1.29 Å. The C(1)-O(2) bond length is 1.26 Å. In the second C site, C(2) is bonded in a distorted trigonal non-coplanar geometry to one H(1), one H(2), and one O(3) atom. The C(2)-H(1) bond length is 1.10 Å. The C(2)-H(2) bond length is 1.10 Å. The C(2)-O(3) bond length is 1.43 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(3) 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(3) bond length is 1.42 Å. In the fourth C site, C(4) is bonded in a distorted bent 120 degrees geometry to one O(4) and one O(5) atom. The C(4)-O(4) bond length is 1.27 Å. The C(4)-O(5) bond length is 1.28 Å. There are eight 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(2) 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 O(10) atom. The H(5)-O(10) bond length is 1.00 Å. In the sixth H site, H(6) is bonded in a single-bond geometry to one O(10) atom. The H(6)-O(10) bond length is 0.98 Å. In the seventh H site, H(7) is bonded in a distorted single-bond geometry to one O(15) and one O(6) atom. The H(7)-O(15) bond length is 0.99 Å. The H(7)-O(6) bond length is 1.71 Å. In the eighth H site, H(8) is bonded in a single-bond geometry to one O(15) atom. The H(8)-O(15) bond length is 0.99 Å. There are two inequivalent S sites. In the first S site, S(1) is bonded in a tetrahedral geometry to one O(6), one O(7), one O(8), and one O(9) atom. The S(1)-O(6) bond length is 1.50 Å. The S(1)-O(7) bond length is 1.50 Å. The S(1)-O(8) bond length is 1.48 Å. The S(1)-O(9) bond length is 1.47 Å. In the second S site, S(2) is bonded in a tetrahedral geometry to one O(11), one O(12), one O(13), and one O(14) atom. The S(2)-O(11) bond length is 1.52 Å. The S(2)-O(12) bond length is 1.50 Å. The S(2)-O(13) bond length is 1.47 Å. The S(2)-O(14) bond length is 1.46 Å. There are fifteen inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to two equivalent Pr(1) and one C(1) atom. In the second O site, O(2) is bonded in a single-bond geometry to one Pr(1) and one C(1) atom. In the third O site, O(3) is bonded in a distorted bent 120 degrees geometry to one Pr(1), one C(2), and one C(3) atom. In the fourth O site, O(4) is bonded in a distorted single-bond geometry to one Pr(1), one Pr(2), and one C(4) atom. In the fifth O site, O(5) is bonded in a distorted single-bond geometry to two equivalent Pr(2) and one C(4) atom. In the sixth O site, O(6) is bonded in a distorted single-bond geometry to one Pr(1), one H(7), and one S(1) atom. In the seventh O site, O(7) is bonded in a distorted single-bond geometry to one Pr(1) and one S(1) atom. In the eighth O site, O(8) is bonded in a distorted bent 150 degrees geometry to one Pr(1) and one S(1) atom. In the ninth O site, O(9) is bonded in a distorted bent 150 degrees geometry to one Pr(2) and one S(1) atom. In the tenth O site, O(10) is bonded in a water-like geometry to one Pr(1), one H(5), and one H(6) atom. In the eleventh O site, O(11) is bonded in a 3-coordinate geometry to two equivalent Pr(2) and one S(2) atom. In the twelfth O site, O(12) is bonded in a distorted single-bond geometry to one Pr(2) and one S(2) atom. In the thirteenth O site, O(13) is bonded in a bent 150 degrees geometry to one Pr(2) and one S(2) atom. In the fourteenth O site, O(14) is bonded in a distorted bent 150 degrees geometry to one Pr(1) and one S(2) atom. In the fifteenth O site, O(15) is bonded in a distorted water-like geometry to one Pr(2), one H(7), and one H(8) atom. Linkers: 4 [O]S([O])(=O)=O ,2 [O]C(=O)COCC([O])=O. Metal clusters: 4 [Pr]. The MOF has largest included sphere 2.40 A, density 3.10 g/cm3, surface area 1848.27 m2/g, accessible volume 0.07 cm3/g