K3CN6H3O7 crystallizes in the triclinic P-1 space group. There are three inequivalent K sites. In the first K site, K(1) is bonded to one N(4), one H(3), one O(2), two equivalent O(1), and two equivalent O(5) atoms to form distorted edge-sharing KHNO5 pentagonal bipyramids. The K(1)-N(4) bond length is 2.86 Å. The K(1)-H(3) bond length is 2.87 Å. The K(1)-O(2) bond length is 2.71 Å. There is one shorter (2.72 Å) and one longer (2.76 Å) K(1)-O(1) bond length. There is one shorter (2.74 Å) and one longer (2.79 Å) K(1)-O(5) bond length. In the second K site, K(2) is bonded in a 7-coordinate geometry to one N(2), one O(3), one O(5), one O(6), one O(7), and two equivalent O(4) atoms. The K(2)-N(2) bond length is 2.93 Å. The K(2)-O(3) bond length is 2.78 Å. The K(2)-O(5) bond length is 2.75 Å. The K(2)-O(6) bond length is 2.73 Å. The K(2)-O(7) bond length is 3.00 Å. There is one shorter (2.78 Å) and one longer (2.89 Å) K(2)-O(4) bond length. In the third K site, K(3) is bonded in a 6-coordinate geometry to one N(6), one O(3), one O(4), one O(7), and two equivalent O(2) atoms. The K(3)-N(6) bond length is 3.01 Å. The K(3)-O(3) bond length is 2.93 Å. The K(3)-O(4) bond length is 2.85 Å. The K(3)-O(7) bond length is 2.70 Å. There is one shorter (2.69 Å) and one longer (2.92 Å) K(3)-O(2) bond length. C(1) is bonded to one N(1), one N(3), one N(5), and one H(1) atom to form CHN3 tetrahedra that share  a cornercorner with one O(5)K3N trigonal pyramid. The C(1)-N(1) bond length is 1.46 Å. The C(1)-N(3) bond length is 1.48 Å. The C(1)-N(5) bond length is 1.45 Å. The C(1)-H(1) bond length is 1.10 Å. There are six inequivalent N sites. In the first N site, N(1) is bonded in a distorted trigonal planar geometry to one C(1), one N(2), and one O(1) atom. The N(1)-N(2) bond length is 1.32 Å. The N(1)-O(1) bond length is 1.30 Å. In the second N site, N(2) is bonded in a 1-coordinate geometry to one K(2), one N(1), and one O(2) atom. The N(2)-O(2) bond length is 1.29 Å. In the third N site, N(3) is bonded in a distorted trigonal planar geometry to one C(1), one N(4), and one O(3) atom. The N(3)-N(4) bond length is 1.31 Å. The N(3)-O(3) bond length is 1.32 Å. In the fourth N site, N(4) is bonded in a 3-coordinate geometry to one K(1), one N(3), and one O(4) atom. The N(4)-O(4) bond length is 1.28 Å. In the fifth N site, N(5) is bonded in a distorted bent 120 degrees geometry to one C(1), one N(6), and one O(5) atom. The N(5)-N(6) bond length is 1.34 Å. The N(5)-O(5) bond length is 1.31 Å. In the sixth N site, N(6) is bonded in a 1-coordinate geometry to one K(3), one N(5), and one O(6) atom. The N(6)-O(6) bond length is 1.27 Å. There are three inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one C(1) atom. In the second H site, H(2) is bonded in a distorted single-bond geometry to one O(7) atom. The H(2)-O(7) bond length is 1.00 Å. In the third H site, H(3) is bonded in a single-bond geometry to one K(1) and one O(7) atom. The H(3)-O(7) bond length is 0.97 Å. There are seven inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to two equivalent K(1) and one N(1) atom. In the second O site, O(2) is bonded in a 4-coordinate geometry to one K(1), two equivalent K(3), and one N(2) atom. In the third O site, O(3) is bonded in a 1-coordinate geometry to one K(2), one K(3), and one N(3) atom. In the fourth O site, O(4) is bonded in a 4-coordinate geometry to one K(3), two equivalent K(2), and one N(4) atom. In the fifth O site, O(5) is bonded to one K(2), two equivalent K(1), and one N(5) atom to form distorted OK3N trigonal pyramids that share  a cornercorner with one C(1)HN3 tetrahedra and  an edgeedge with one O(5)K3N trigonal pyramid. In the sixth O site, O(6) is bonded in a distorted bent 120 degrees geometry to one K(2) and one N(6) atom. In the seventh O site, O(7) is bonded in a distorted water-like geometry to one K(2), one K(3), one H(2), and one H(3) atom. Linkers: 2 [O][N]N([O])C(N([O])[N][O])N([O])[N][O]. Metal clusters: 6 [K]. The MOF has largest included sphere 1.43 A, density 2.01 g/cm3, surface area 593.56 m2/g, accessible volume 0.01 cm3/g