KC6PNH9O8 crystallizes in the monoclinic P2_1/c space group. K(1) is bonded in a 7-coordinate geometry to one O(2), one O(3), one O(5), one O(6), one O(7), and two equivalent O(8) atoms. The K(1)-O(2) bond length is 2.87 Å. The K(1)-O(3) bond length is 2.85 Å. The K(1)-O(5) bond length is 2.80 Å. The K(1)-O(6) bond length is 3.06 Å. The K(1)-O(7) bond length is 2.87 Å. There is one shorter (2.74 Å) and one longer (2.75 Å) K(1)-O(8) bond length. There are six inequivalent C sites. In the first C site, C(1) is bonded in a distorted single-bond geometry to one C(2), one C(6), and one O(1) atom. The C(1)-C(2) bond length is 1.41 Å. The C(1)-C(6) bond length is 1.41 Å. The C(1)-O(1) bond length is 1.36 Å. In the second C site, C(2) is bonded in a distorted trigonal planar geometry to one C(1), one C(3), and one H(2) atom. The C(2)-C(3) bond length is 1.38 Å. The C(2)-H(2) bond length is 1.09 Å. In the third C site, C(3) is bonded in a distorted trigonal planar geometry to one C(2), one C(4), and one H(3) atom. The C(3)-C(4) bond length is 1.40 Å. The C(3)-H(3) bond length is 1.09 Å. In the fourth C site, C(4) is bonded in a trigonal planar geometry to one C(3), one C(5), and one N(1) atom. The C(4)-C(5) bond length is 1.40 Å. The C(4)-N(1) bond length is 1.44 Å. In the fifth C site, C(5) is bonded in a distorted trigonal planar geometry to one C(4), one C(6), and one H(4) atom. The C(5)-C(6) bond length is 1.39 Å. The C(5)-H(4) bond length is 1.09 Å. In the sixth C site, C(6) is bonded in a distorted trigonal planar geometry to one C(1), one C(5), and one H(5) atom. The C(6)-H(5) bond length is 1.09 Å. P(1) is bonded in a tetrahedral geometry to one O(1), one O(2), one O(3), and one O(4) atom. The P(1)-O(1) bond length is 1.66 Å. The P(1)-O(2) bond length is 1.57 Å. The P(1)-O(3) bond length is 1.52 Å. The P(1)-O(4) bond length is 1.51 Å. N(1) is bonded in a trigonal planar geometry to one C(4), one O(5), and one O(6) atom. The N(1)-O(5) bond length is 1.25 Å. The N(1)-O(6) bond length is 1.25 Å. There are nine inequivalent H sites. In the first H site, H(1) is bonded in a linear geometry to one O(2) and one O(7) atom. The H(1)-O(2) bond length is 1.07 Å. The H(1)-O(7) bond length is 1.41 Å. 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(5) atom. In the fifth H site, H(5) is bonded in a single-bond geometry to one C(6) atom. In the sixth H site, H(6) is bonded in a distorted single-bond geometry to one O(7) atom. The H(6)-O(7) bond length is 1.00 Å. In the seventh H site, H(7) is bonded in a distorted linear geometry to one O(4) and one O(7) atom. The H(7)-O(4) bond length is 1.63 Å. The H(7)-O(7) bond length is 1.01 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 0.98 Å. In the ninth H site, H(9) is bonded in a single-bond geometry to one O(8) atom. The H(9)-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 bent 120 degrees geometry to one C(1) and one P(1) atom. In the second O site, O(2) is bonded in a distorted bent 120 degrees geometry to one K(1), one P(1), and one H(1) atom. In the third O site, O(3) is bonded in a 1-coordinate geometry to one K(1) and one P(1) atom. In the fourth O site, O(4) is bonded in a bent 120 degrees geometry to one P(1) and one H(7) atom. In the fifth O site, O(5) is bonded in a distorted single-bond geometry to one K(1) and one N(1) atom. In the sixth O site, O(6) is bonded in a single-bond geometry to one K(1) and one N(1) atom. In the seventh O site, O(7) is bonded in a distorted trigonal non-coplanar geometry to one K(1), one H(1), one H(6), and one H(7) atom. In the eighth O site, O(8) is bonded in a distorted water-like geometry to two equivalent K(1), one H(8), and one H(9) atom. Linkers: 4 [O]P(=O)(O)Oc1ccc([N+](=O)[O-])cc1. Metal clusters: 4 [K]. The MOF has largest included sphere 1.97 A, density 1.75 g/cm3, surface area 2974.27 m2/g, accessible volume 0.07 cm3/g