KC3N3H2O2 crystallizes in the triclinic P1 space group. There are four inequivalent K sites. In the first K site, K(1) is bonded in a 9-coordinate geometry to one N(5), one N(6), one N(7), one N(8), one H(2), one O(2), one O(3), one O(6), and one O(7) atom. The K(1)-N(5) bond length is 3.40 Å. The K(1)-N(6) bond length is 2.99 Å. The K(1)-N(7) bond length is 3.09 Å. The K(1)-N(8) bond length is 3.14 Å. The K(1)-H(2) bond length is 2.87 Å. The K(1)-O(2) bond length is 2.74 Å. The K(1)-O(3) bond length is 2.77 Å. The K(1)-O(6) bond length is 2.83 Å. The K(1)-O(7) bond length is 3.22 Å. In the second K site, K(2) is bonded in a 9-coordinate geometry to one N(5), one N(6), one N(7), one N(8), one H(1), one O(1), one O(4), one O(5), and one O(8) atom. The K(2)-N(5) bond length is 2.99 Å. The K(2)-N(6) bond length is 3.41 Å. The K(2)-N(7) bond length is 3.14 Å. The K(2)-N(8) bond length is 3.09 Å. The K(2)-H(1) bond length is 2.87 Å. The K(2)-O(1) bond length is 2.74 Å. The K(2)-O(4) bond length is 2.76 Å. The K(2)-O(5) bond length is 2.83 Å. The K(2)-O(8) bond length is 3.21 Å. In the third K site, K(3) is bonded in a 4-coordinate geometry to one O(1), one O(3), one O(5), and one O(7) atom. The K(3)-O(1) bond length is 2.68 Å. The K(3)-O(3) bond length is 2.66 Å. The K(3)-O(5) bond length is 2.87 Å. The K(3)-O(7) bond length is 2.83 Å. In the fourth K site, K(4) is bonded in a 4-coordinate geometry to one O(2), one O(4), one O(6), and one O(8) atom. The K(4)-O(2) bond length is 2.68 Å. The K(4)-O(4) bond length is 2.67 Å. The K(4)-O(6) bond length is 2.88 Å. The K(4)-O(8) bond length is 2.83 Å. There are twelve inequivalent C sites. In the first C site, C(1) is bonded in a distorted single-bond geometry to one C(11), one C(3), and one O(3) atom. The C(1)-C(11) bond length is 1.47 Å. The C(1)-C(3) bond length is 1.47 Å. The C(1)-O(3) bond length is 1.24 Å. In the second C site, C(2) is bonded in a distorted single-bond geometry to one C(12), one C(4), and one O(4) atom. The C(2)-C(12) bond length is 1.47 Å. The C(2)-C(4) bond length is 1.47 Å. The C(2)-O(4) bond length is 1.24 Å. In the third C site, C(3) is bonded in a distorted single-bond geometry to one C(1), one C(5), and one N(1) atom. The C(3)-C(5) bond length is 1.41 Å. The C(3)-N(1) bond length is 1.35 Å. In the fourth C site, C(4) is bonded in a distorted single-bond geometry to one C(2), one C(6), and one N(2) atom. The C(4)-C(6) bond length is 1.41 Å. The C(4)-N(2) bond length is 1.35 Å. In the fifth C site, C(5) is bonded in a distorted single-bond geometry to one C(3), one C(7), and one N(5) atom. The C(5)-C(7) bond length is 1.47 Å. The C(5)-N(5) bond length is 1.35 Å. In the sixth C site, C(6) is bonded in a distorted single-bond geometry to one C(4), one C(8), and one N(6) atom. The C(6)-C(8) bond length is 1.47 Å. The C(6)-N(6) bond length is 1.35 Å. In the seventh C site, C(7) is bonded in a distorted single-bond geometry to one C(5), one C(9), and one O(1) atom. The C(7)-C(9) bond length is 1.46 Å. The C(7)-O(1) bond length is 1.24 Å. In the eighth C site, C(8) is bonded in a distorted single-bond geometry to one C(10), one C(6), and one O(2) atom. The C(8)-C(10) bond length is 1.46 Å. The C(8)-O(2) bond length is 1.24 Å. In the ninth C site, C(9) is bonded in a distorted single-bond geometry to one C(11), one C(7), and one N(11) atom. The C(9)-C(11) bond length is 1.41 Å. The C(9)-N(11) bond length is 1.35 Å. In the tenth C site, C(10) is bonded in a distorted single-bond geometry to one C(12), one C(8), and one N(12) atom. The C(10)-C(12) bond length is 1.41 Å. The C(10)-N(12) bond length is 1.35 Å. In the eleventh C site, C(11) is bonded in a distorted single-bond geometry to one C(1), one C(9), and one N(7) atom. The C(11)-N(7) bond length is 1.35 Å. In the twelfth C site, C(12) is bonded in a distorted single-bond geometry to one C(10), one C(2), and one N(8) atom. The C(12)-N(8) bond length is 1.35 Å. There are twelve inequivalent N sites. In the first N site, N(1) is bonded in a 1-coordinate geometry to one C(3) and one N(3) atom. The N(1)-N(3) bond length is 1.34 Å. In the second N site, N(2) is bonded in a 1-coordinate geometry to one C(4) and one N(4) atom. The N(2)-N(4) bond length is 1.34 Å. In the third N site, N(3) is bonded in a distorted water-like geometry to one N(1) and one N(5) atom. The N(3)-N(5) bond length is 1.35 Å. In the fourth N site, N(4) is bonded in a distorted water-like geometry to one N(2) and one N(6) atom. The N(4)-N(6) bond length is 1.35 Å. In the fifth N site, N(5) is bonded in a distorted single-bond geometry to one K(1), one K(2), one C(5), and one N(3) atom. In the sixth N site, N(6) is bonded in a distorted single-bond geometry to one K(1), one K(2), one C(6), and one N(4) atom. In the seventh N site, N(7) is bonded in a distorted single-bond geometry to one K(1), one K(2), one C(11), and one N(9) atom. The N(7)-N(9) bond length is 1.35 Å. In the eighth N site, N(8) is bonded in a distorted single-bond geometry to one K(1), one K(2), one C(12), and one N(10) atom. The N(8)-N(10) bond length is 1.35 Å. In the ninth N site, N(9) is bonded in a distorted water-like geometry to one N(11) and one N(7) atom. The N(9)-N(11) bond length is 1.34 Å. In the tenth N site, N(10) is bonded in a distorted water-like geometry to one N(12) and one N(8) atom. The N(10)-N(12) bond length is 1.34 Å. In the eleventh N site, N(11) is bonded in a 1-coordinate geometry to one C(9) and one N(9) atom. In the twelfth N site, N(12) is bonded in a 1-coordinate geometry to one C(10) and one N(10) atom. There are eight inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one K(2) and one O(5) atom. The H(1)-O(5) bond length is 0.99 Å. In the second H site, H(2) is bonded in a single-bond geometry to one K(1) and one O(6) atom. The H(2)-O(6) bond length is 0.99 Å. In the third H site, H(3) is bonded in a single-bond geometry to one O(5) atom. The H(3)-O(5) bond length is 1.00 Å. In the fourth H site, H(4) is bonded in a single-bond geometry to one O(6) atom. The H(4)-O(6) bond length is 1.00 Å. In the fifth H site, H(5) is bonded in a single-bond geometry to one O(7) atom. The H(5)-O(7) bond length is 1.00 Å. In the sixth H site, H(6) is bonded in a single-bond geometry to one O(8) atom. The H(6)-O(8) bond length is 1.00 Å. In the seventh H site, H(7) is bonded in a single-bond geometry to one O(7) atom. The H(7)-O(7) bond length is 0.99 Å. In the eighth H site, H(8) is bonded in a single-bond geometry to one O(8) atom. The H(8)-O(8) bond length is 0.99 Å. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to one K(2), one K(3), and one C(7) atom. In the second O site, O(2) is bonded in a distorted single-bond geometry to one K(1), one K(4), and one C(8) atom. In the third O site, O(3) is bonded in a distorted single-bond geometry to one K(1), one K(3), and one C(1) atom. In the fourth O site, O(4) is bonded in a distorted single-bond geometry to one K(2), one K(4), and one C(2) atom. In the fifth O site, O(5) is bonded in a water-like geometry to one K(2), one K(3), one H(1), and one H(3) atom. In the sixth O site, O(6) is bonded in a water-like geometry to one K(1), one K(4), one H(2), and one H(4) atom. In the seventh O site, O(7) is bonded in a water-like geometry to one K(1), one K(3), one H(5), and one H(7) atom. In the eighth O site, O(8) is bonded in a water-like geometry to one K(2), one K(4), one H(6), and one H(8) atom. Linkers: 1 O=C1[C]2N=NN=C2C(=O)C2=N[N]N=C12 ,1 O=C1[C]2N=NN=C2C(=O)C2=C1N=N[N]2. Metal clusters: 4 [K]. The MOF has largest included sphere 1.30 A, density 1.90 g/cm3, surface area 1209.21 m2/g, accessible volume 0.02 cm3/g