HoC8PNH9O9 crystallizes in the monoclinic P2_1/c space group. Ho(1) is bonded in a 8-coordinate geometry to one O(1), one O(3), one O(4), one O(5), one O(6), one O(7), one O(8), and one O(9) atom. The Ho(1)-O(1) bond length is 2.22 Å. The Ho(1)-O(3) bond length is 2.27 Å. The Ho(1)-O(4) bond length is 2.37 Å. The Ho(1)-O(5) bond length is 2.31 Å. The Ho(1)-O(6) bond length is 2.35 Å. The Ho(1)-O(7) bond length is 2.40 Å. The Ho(1)-O(8) bond length is 2.46 Å. The Ho(1)-O(9) bond length is 2.54 Å. There are eight inequivalent C sites. In the first C site, C(1) is bonded in a distorted trigonal planar geometry to one C(2), one N(1), and one H(1) atom. The C(1)-C(2) bond length is 1.38 Å. The C(1)-N(1) bond length is 1.36 Å. The C(1)-H(1) bond length is 1.09 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 1.40 Å. The C(2)-H(2) bond length is 1.09 Å. In the third C site, C(3) is bonded in a distorted single-bond geometry to one C(2) and one H(3) atom. The C(3)-H(3) bond length is 1.09 Å. In the fourth C site, C(4) is bonded in a distorted single-bond geometry to one C(5) and one H(4) atom. The C(4)-C(5) bond length is 1.39 Å. The C(4)-H(4) bond length is 1.09 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 N(1) atom. The C(5)-C(6) bond length is 1.49 Å. The C(5)-N(1) bond length is 1.38 Å. In the sixth C site, C(6) is bonded in a distorted tetrahedral geometry to one C(5), one P(1), one H(5), and one H(6) atom. The C(6)-P(1) bond length is 1.83 Å. The C(6)-H(5) bond length is 1.10 Å. The C(6)-H(6) bond length is 1.10 Å. In the seventh C site, C(7) is bonded in a distorted bent 120 degrees geometry to one O(5) and one O(6) atom. The C(7)-O(5) bond length is 1.27 Å. The C(7)-O(6) bond length is 1.26 Å. In the eighth C site, C(8) is bonded in a distorted bent 120 degrees geometry to one O(7) and one O(8) atom. The C(8)-O(7) bond length is 1.26 Å. The C(8)-O(8) bond length is 1.27 Å. P(1) is bonded in a distorted tetrahedral geometry to one C(6), one O(1), one O(2), and one O(3) atom. The P(1)-O(1) bond length is 1.51 Å. The P(1)-O(2) bond length is 1.59 Å. The P(1)-O(3) bond length is 1.52 Å. N(1) is bonded in a trigonal planar geometry to one C(1), one C(5), and one O(4) atom. The N(1)-O(4) bond length is 1.32 Å. There are nine 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(3) atom. In the fourth H site, H(4) is bonded in a single-bond geometry to one C(4) 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(6) atom. In the seventh H site, H(7) is bonded in a distorted linear geometry to one O(2) and one O(8) atom. The H(7)-O(2) bond length is 1.01 Å. The H(7)-O(8) bond length is 1.61 Å. In the eighth H site, H(8) is bonded in a single-bond geometry to one O(9) atom. The H(8)-O(9) bond length is 0.98 Å. In the ninth H site, H(9) is bonded in a single-bond geometry to one O(9) atom. The H(9)-O(9) bond length is 0.97 Å. There are nine inequivalent O sites. In the first O site, O(1) is bonded in a bent 150 degrees geometry to one Ho(1) and one P(1) atom. In the second O site, O(2) is bonded in a water-like geometry to one P(1) and one H(7) atom. In the third O site, O(3) is bonded in a distorted bent 150 degrees geometry to one Ho(1) and one P(1) atom. In the fourth O site, O(4) is bonded in a distorted bent 120 degrees geometry to one Ho(1) and one N(1) atom. In the fifth O site, O(5) is bonded in a bent 120 degrees geometry to one Ho(1) and one C(7) atom. In the sixth O site, O(6) is bonded in a bent 120 degrees geometry to one Ho(1) and one C(7) atom. In the seventh O site, O(7) is bonded in a distorted bent 120 degrees geometry to one Ho(1) and one C(8) atom. In the eighth O site, O(8) is bonded in a distorted trigonal planar geometry to one Ho(1), one C(8), and one H(7) atom. In the ninth O site, O(9) is bonded in a water-like geometry to one Ho(1), one H(8), and one H(9) atom. Linkers: 4 [O]P(=O)(O)Cc1cccc[n+]1[O-] ,3 [O]C(=O)C([O])=O. Metal clusters: 4 [Ho]. RCSR code: jeb. The MOF has largest included sphere 3.83 A, density 2.02 g/cm3, surface area 3087.14 m2/g, accessible volume 0.16 cm3/g