NdRu2P4H20(CO5)4 crystallizes in the monoclinic C2/c space group. Nd(1) is bonded in a 8-coordinate geometry to two equivalent O(10), two equivalent O(3), two equivalent O(6), and two equivalent O(9) atoms. Both Nd(1)-O(10) bond lengths are 2.60 Å. Both Nd(1)-O(3) bond lengths are 2.40 Å. Both Nd(1)-O(6) bond lengths are 2.36 Å. Both Nd(1)-O(9) bond lengths are 2.52 Å. Ru(1) is bonded in a 5-coordinate geometry to one O(1), one O(2), one O(4), one O(5), and one O(8) atom. The Ru(1)-O(1) bond length is 2.04 Å. The Ru(1)-O(2) bond length is 2.04 Å. The Ru(1)-O(4) bond length is 2.05 Å. The Ru(1)-O(5) bond length is 2.04 Å. The Ru(1)-O(8) bond length is 2.44 Å. There are two inequivalent C sites. In the first C site, C(1) is bonded in a distorted tetrahedral geometry to one C(2), one P(1), one P(2), and one O(7) atom. The C(1)-C(2) bond length is 1.52 Å. The C(1)-P(1) bond length is 1.86 Å. The C(1)-P(2) bond length is 1.85 Å. The C(1)-O(7) bond length is 1.46 Å. In the second C site, C(2) is bonded in a trigonal non-coplanar geometry to one C(1), one H(1), one H(2), and one H(3) atom. The C(2)-H(1) bond length is 1.10 Å. The C(2)-H(2) bond length is 1.10 Å. The C(2)-H(3) bond length is 1.10 Å. There are two inequivalent P sites. In the first P site, P(1) is bonded to one C(1), one O(1), one O(2), and one O(3) atom to form corner-sharing PCO3 tetrahedra. The P(1)-O(1) bond length is 1.56 Å. The P(1)-O(2) bond length is 1.58 Å. The P(1)-O(3) bond length is 1.50 Å. In the second P site, P(2) is bonded to one C(1), one O(4), one O(5), and one O(6) atom to form corner-sharing PCO3 tetrahedra. The P(2)-O(4) bond length is 1.57 Å. The P(2)-O(5) bond length is 1.56 Å. The P(2)-O(6) bond length is 1.50 Å. There are ten inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one C(2) 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 O(7) atom. The H(4)-O(7) bond length is 0.98 Å. In the fifth H site, H(5) is bonded in a single-bond geometry to one O(8) atom. The H(5)-O(8) bond length is 0.98 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 0.98 Å. In the seventh H site, H(7) is bonded in a single-bond geometry to one O(2) and one O(9) atom. The H(7)-O(2) bond length is 1.76 Å. The H(7)-O(9) bond length is 0.99 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 0.99 Å. In the ninth H site, H(9) is bonded in a single-bond geometry to one O(10) atom. The H(9)-O(10) bond length is 0.99 Å. In the tenth H site, H(10) is bonded in a single-bond geometry to one O(10) atom. The H(10)-O(10) bond length is 0.97 Å. There are ten inequivalent O sites. In the first O site, O(2) is bonded in a 3-coordinate geometry to one Ru(1), one P(1), and one H(7) atom. In the second O site, O(3) is bonded in a distorted bent 150 degrees geometry to one Nd(1) and one P(1) atom. In the third O site, O(4) is bonded in a distorted bent 120 degrees geometry to one Ru(1) and one P(2) atom. In the fourth O site, O(5) is bonded in a bent 120 degrees geometry to one Ru(1) and one P(2) atom. In the fifth O site, O(6) is bonded in a bent 150 degrees geometry to one Nd(1) and one P(2) atom. In the sixth O site, O(7) is bonded in a water-like geometry to one C(1) and one H(4) atom. In the seventh O site, O(8) is bonded in a distorted water-like geometry to one Ru(1), one H(5), and one H(6) atom. In the eighth O site, O(9) is bonded in a distorted water-like geometry to one Nd(1), one H(7), and one H(8) atom. In the ninth O site, O(10) is bonded in a water-like geometry to one Nd(1), one H(10), and one H(9) atom. In the tenth O site, O(1) is bonded in a bent 120 degrees geometry to one Ru(1) and one P(1) atom. Linkers: 4 CC(O)(P([O])([O])=O)P([O])([O])=O. Metal clusters: 2 [Nd] ,4 [Ru]. The MOF has largest included sphere 4.15 A, density 2.00 g/cm3, surface area 2646.73 m2/g, accessible volume 0.17 cm3/g