KC9PN2H12O9 crystallizes in the orthorhombic P2_12_12_1 space group. K(1) is bonded in a 7-coordinate geometry to one O(2), one O(3), one O(4), one O(5), one O(6), one O(7), and one O(8) atom. The K(1)-O(2) bond length is 2.73 Å. The K(1)-O(3) bond length is 2.80 Å. The K(1)-O(4) bond length is 2.98 Å. The K(1)-O(5) bond length is 2.81 Å. The K(1)-O(6) bond length is 2.95 Å. The K(1)-O(7) bond length is 2.74 Å. The K(1)-O(8) bond length is 2.72 Å. There are nine inequivalent C sites. In the first C site, C(1) is bonded in a distorted water-like geometry to one H(1) and one O(7) atom. The C(1)-H(1) bond length is 1.10 Å. The C(1)-O(7) bond length is 1.41 Å. In the second C site, C(2) is bonded in a distorted trigonal non-coplanar geometry to one H(2), one H(3), and one O(1) atom. The C(2)-H(2) bond length is 1.10 Å. The C(2)-H(3) bond length is 1.10 Å. The C(2)-O(1) bond length is 1.44 Å. In the third C site, C(3) is bonded in a distorted water-like geometry to one H(4) and one O(2) atom. The C(3)-H(4) bond length is 1.10 Å. The C(3)-O(2) bond length is 1.45 Å. In the fourth C site, C(4) is bonded in a trigonal planar geometry to one N(1), one N(2), and one O(5) atom. The C(4)-N(1) bond length is 1.40 Å. The C(4)-N(2) bond length is 1.37 Å. The C(4)-O(5) bond length is 1.24 Å. In the fifth C site, C(5) is bonded in a distorted bent 120 degrees geometry to one N(2) and one O(8) atom. The C(5)-N(2) bond length is 1.40 Å. The C(5)-O(8) bond length is 1.25 Å. In the sixth C site, C(6) is bonded in a distorted trigonal non-coplanar geometry to one N(1), one H(5), and one O(2) atom. The C(6)-N(1) bond length is 1.48 Å. The C(6)-H(5) bond length is 1.10 Å. The C(6)-O(2) bond length is 1.42 Å. In the seventh C site, C(7) is bonded in a distorted water-like geometry to one H(6) and one O(3) atom. The C(7)-H(6) bond length is 1.10 Å. The C(7)-O(3) bond length is 1.42 Å. In the eighth C site, C(8) is bonded in a distorted trigonal planar geometry to one C(9), one N(1), and one H(7) atom. The C(8)-C(9) bond length is 1.36 Å. The C(8)-N(1) bond length is 1.37 Å. The C(8)-H(7) bond length is 1.09 Å. In the ninth C site, C(9) is bonded in a distorted single-bond geometry to one C(8) and one H(8) atom. The C(9)-H(8) bond length is 1.08 Å. P(1) is bonded in a tetrahedral geometry to one O(1), one O(4), one O(6), and one O(9) atom. The P(1)-O(1) bond length is 1.62 Å. The P(1)-O(4) bond length is 1.57 Å. The P(1)-O(6) bond length is 1.53 Å. The P(1)-O(9) bond length is 1.51 Å. There are two inequivalent N sites. In the first N site, N(1) is bonded in a trigonal planar geometry to one C(4), one C(6), and one C(8) atom. In the second N site, N(2) is bonded in a trigonal planar geometry to one C(4), one C(5), and one H(11) atom. The N(2)-H(11) bond length is 1.05 Å. There are twelve 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 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(2) 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 C(6) atom. In the sixth H site, H(6) is bonded in a single-bond geometry to one C(7) atom. In the seventh H site, H(7) is bonded in a single-bond geometry to one C(8) atom. In the eighth H site, H(8) is bonded in a single-bond geometry to one C(9) atom. In the ninth H site, H(9) is bonded in a linear geometry to one O(4) and one O(6) atom. The H(9)-O(4) bond length is 1.04 Å. The H(9)-O(6) bond length is 1.51 Å. In the tenth H site, H(10) is bonded in a distorted single-bond geometry to one O(3) and one O(9) atom. The H(10)-O(3) bond length is 1.00 Å. The H(10)-O(9) bond length is 1.64 Å. In the eleventh H site, H(11) is bonded in a distorted single-bond geometry to one N(2) atom. In the twelfth H site, H(12) is bonded in a single-bond geometry to one O(7) and one O(9) atom. The H(12)-O(7) bond length is 1.00 Å. The H(12)-O(9) bond length is 1.69 Å. There are nine inequivalent O sites. In the first O site, O(8) is bonded in a distorted single-bond geometry to one K(1) and one C(5) atom. In the second O site, O(9) is bonded in a 3-coordinate geometry to one P(1), one H(10), and one H(12) atom. In the third O site, O(1) is bonded in a bent 120 degrees geometry to one C(2) and one P(1) atom. In the fourth O site, O(2) is bonded in a distorted water-like geometry to one K(1), one C(3), and one C(6) atom. In the fifth O site, O(3) is bonded in a distorted water-like geometry to one K(1), one C(7), and one H(10) atom. In the sixth O site, O(4) is bonded in a distorted bent 120 degrees geometry to one K(1), one P(1), and one H(9) atom. In the seventh O site, O(5) is bonded in a single-bond geometry to one K(1) and one C(4) atom. In the eighth O site, O(6) is bonded in a 2-coordinate geometry to one K(1), one P(1), and one H(9) atom. In the ninth O site, O(7) is bonded in a distorted bent 120 degrees geometry to one K(1), one C(1), and one H(12) atom. Linkers: 4 [O]P(=O)(O)OC[C@H]1O[C@@H](n2ccc(=O)[nH]c2=O)[C@H](O)[C@@H]1O. Metal clusters: 4 [K]. RCSR code: hcb. The MOF has largest included sphere 1.90 A, density 1.78 g/cm3, surface area 3000.49 m2/g, accessible volume 0.06 cm3/g