KSnH6(C2O)6 crystallizes in the trigonal R3 space group. There are two inequivalent K sites. In the first K site, K(1) is bonded in a 9-coordinate geometry to three equivalent H(8), three equivalent O(1), and three equivalent O(8) atoms. All K(1)-H(8) bond lengths are 2.88 Å. All K(1)-O(1) bond lengths are 3.12 Å. All K(1)-O(8) bond lengths are 2.70 Å. In the second K site, K(2) is bonded in a 9-coordinate geometry to one H(5), one H(6), one H(7), one O(2), one O(3), one O(4), one O(5), one O(6), and one O(7) atom. The K(2)-H(5) bond length is 2.87 Å. The K(2)-H(6) bond length is 2.87 Å. The K(2)-H(7) bond length is 2.86 Å. The K(2)-O(2) bond length is 3.12 Å. The K(2)-O(3) bond length is 3.13 Å. The K(2)-O(4) bond length is 3.13 Å. The K(2)-O(5) bond length is 2.70 Å. The K(2)-O(6) bond length is 2.70 Å. The K(2)-O(7) bond length is 2.70 Å. There are two inequivalent Sn sites. In the first Sn site, Sn(1) is bonded in a 3-coordinate geometry to three equivalent O(1) atoms. All Sn(1)-O(1) bond lengths are 2.23 Å. In the second Sn site, Sn(2) is bonded in a 3-coordinate geometry to one O(2), one O(3), and one O(4) atom. The Sn(2)-O(2) bond length is 2.23 Å. The Sn(2)-O(3) bond length is 2.23 Å. The Sn(2)-O(4) bond length is 2.23 Å. There are twelve inequivalent C sites. In the first C site, C(13,15) is bonded in a distorted single-bond geometry to one C(5) and one H(5) atom. The C(13,15)-C(5) bond length is 1.40 Å. The C(13,15)-H(5) bond length is 1.09 Å. In the second C site, C(14) is bonded in a distorted single-bond geometry to one C(6) and one H(6) atom. The C(14)-C(6) bond length is 1.40 Å. The C(14)-H(6) bond length is 1.09 Å. In the third C site, C(16) is bonded in a distorted single-bond geometry to one C(8) and one H(8) atom. The C(16)-C(8) bond length is 1.40 Å. The C(16)-H(8) bond length is 1.09 Å. In the fourth C site, C(1,3) is bonded in a distorted bent 120 degrees geometry to one C(5), one O(1), and one O(5) atom. The C(1,3)-C(5) bond length is 1.49 Å. The C(1,3)-O(1) bond length is 1.30 Å. The C(1,3)-O(5) bond length is 1.26 Å. In the fifth C site, C(2) is bonded in a distorted bent 120 degrees geometry to one C(6), one O(2), and one O(6) atom. The C(2)-C(6) bond length is 1.49 Å. The C(2)-O(2) bond length is 1.30 Å. The C(2)-O(6) bond length is 1.26 Å. In the sixth C site, C(4) is bonded in a distorted bent 120 degrees geometry to one C(8), one O(4), and one O(8) atom. The C(4)-C(8) bond length is 1.49 Å. The C(4)-O(4) bond length is 1.30 Å. The C(4)-O(8) bond length is 1.26 Å. In the seventh C site, C(5) is bonded in a trigonal planar geometry to one C(1,3); one C(13,15); and one C(9,11,12) atom. The C(5)-C(9,11,12) bond length is 1.40 Å. In the eighth C site, C(6) is bonded in a trigonal planar geometry to one C(10), one C(14), and one C(2) atom. The C(6)-C(10) bond length is 1.40 Å. In the ninth C site, C(7) is bonded in a trigonal planar geometry to one C(1,3); one C(13,15); and one C(9,11,12) atom. The C(7)-C(1,3) bond length is 1.49 Å. The C(7)-C(13,15) bond length is 1.40 Å. The C(7)-C(9,11,12) bond length is 1.40 Å. In the tenth C site, C(8) is bonded in a trigonal planar geometry to one C(16); one C(4); and one C(9,11,12) atom. The C(8)-C(9,11,12) bond length is 1.40 Å. In the eleventh C site, C(9,11,12) is bonded in a distorted single-bond geometry to one C(5) and one H(1,2,3) atom. The C(9,11,12)-H(1,2,3) bond length is 1.09 Å. In the twelfth C site, C(10) is bonded in a distorted single-bond geometry to one C(6) and one H(1,2,3) atom. The C(10)-H(1,2,3) bond length is 1.09 Å. There are six inequivalent H sites. In the first H site, H(1,2,3) is bonded in a single-bond geometry to one C(9,11,12) atom. In the second H site, H(4) is bonded in a single-bond geometry to one C(9,11,12) atom. The H(4)-C(9,11,12) bond length is 1.09 Å. In the third H site, H(5) is bonded in a single-bond geometry to one K(2) and one C(13,15) atom. In the fourth H site, H(6) is bonded in a single-bond geometry to one K(2) and one C(14) atom. In the fifth H site, H(7) is bonded in a single-bond geometry to one K(2) and one C(13,15) atom. The H(7)-C(13,15) bond length is 1.09 Å. In the sixth H site, H(8) is bonded in a single-bond geometry to one K(1) and one C(16) atom. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a 1-coordinate geometry to one K(1); one Sn(1); and one C(1,3) atom. In the second O site, O(2) is bonded in a 1-coordinate geometry to one K(2), one Sn(2), and one C(2) atom. In the third O site, O(3) is bonded in a 1-coordinate geometry to one K(2); one Sn(2); and one C(1,3) atom. The O(3)-C(1,3) bond length is 1.30 Å. In the fourth O site, O(4) is bonded in a 1-coordinate geometry to one K(2), one Sn(2), and one C(4) atom. In the fifth O site, O(5) is bonded in a distorted single-bond geometry to one K(2) and one C(1,3) atom. In the sixth O site, O(6) is bonded in a distorted single-bond geometry to one K(2) and one C(2) atom. In the seventh O site, O(7) is bonded in a distorted single-bond geometry to one K(2) and one C(1,3) atom. The O(7)-C(1,3) bond length is 1.26 Å. In the eighth O site, O(8) is bonded in a distorted single-bond geometry to one K(1) and one C(4) atom. Linkers: 6 [O]C(=O)c1ccc(C([O])=O)cc1. Metal clusters: 4 [K] ,4 [Sn]. The MOF has largest included sphere 1.91 A, density 1.96 g/cm3, surface area 2670.65 m2/g, accessible volume 0.10 cm3/g