MnC3PNH4O3 crystallizes in the trigonal R3 space group. There are two inequivalent Mn sites. In the first Mn site, Mn(1) is bonded in a 6-coordinate geometry to one N(1), one H(3), two equivalent O(2), and two equivalent O(3) atoms. The Mn(1)-N(1) bond length is 2.33 Å. The Mn(1)-H(3) bond length is 2.42 Å. There is one shorter (2.19 Å) and one longer (2.23 Å) Mn(1)-O(2) bond length. There is one shorter (2.14 Å) and one longer (2.26 Å) Mn(1)-O(3) bond length. In the second Mn site, Mn(2) is bonded in a 5-coordinate geometry to one N(2), two equivalent O(5), and two equivalent O(6) atoms. The Mn(2)-N(2) bond length is 2.33 Å. There is one shorter (2.19 Å) and one longer (2.23 Å) Mn(2)-O(5) bond length. There is one shorter (2.14 Å) and one longer (2.26 Å) Mn(2)-O(6) bond length. There are six inequivalent C sites. In the first C site, C(1) is bonded in a bent 120 degrees geometry to one P(1) and one N(1) atom. The C(1)-P(1) bond length is 1.85 Å. The C(1)-N(1) bond length is 1.51 Å. In the second C site, C(2) is bonded to one C(6); one N(1); one H(1,5); and one H(2,6) atom to form distorted CH2CN tetrahedra that share  a cornercorner with one N(2)MnC3 tetrahedra. The C(2)-C(6) bond length is 1.53 Å. The C(2)-N(1) bond length is 1.53 Å. The C(2)-H(1,5) bond length is 1.14 Å. The C(2)-H(2,6) bond length is 1.14 Å. In the third C site, C(3) is bonded in a distorted trigonal non-coplanar geometry to one C(5), one N(1), one H(3), and one H(4) atom. The C(3)-C(5) bond length is 1.53 Å. The C(3)-N(1) bond length is 1.53 Å. The C(3)-H(3) bond length is 1.14 Å. The C(3)-H(4) bond length is 1.14 Å. In the fourth C site, C(4) is bonded in a bent 120 degrees geometry to one P(2) and one N(2) atom. The C(4)-P(2) bond length is 1.85 Å. The C(4)-N(2) bond length is 1.51 Å. In the fifth C site, C(5) is bonded to one C(3); one N(2); one H(1,5); and one H(2,6) atom to form distorted CH2CN tetrahedra that share  a cornercorner with one N(1)MnC3 tetrahedra. The C(5)-N(2) bond length is 1.53 Å. The C(5)-H(1,5) bond length is 1.14 Å. The C(5)-H(2,6) bond length is 1.14 Å. In the sixth C site, C(6) is bonded in a distorted trigonal non-coplanar geometry to one C(2), one N(2), one H(7), and one H(8) atom. The C(6)-N(2) bond length is 1.53 Å. The C(6)-H(7) bond length is 1.14 Å. The C(6)-H(8) bond length is 1.14 Å. There are two inequivalent P sites. In the first P site, P(1) is bonded to one C(1); one O(1,4); one O(2); and one O(3) atom to form distorted PCO3 tetrahedra that share  a cornercorner with one N(1)MnC3 tetrahedra. The P(1)-O(1,4) bond length is 1.50 Å. The P(1)-O(2) bond length is 1.50 Å. The P(1)-O(3) bond length is 1.50 Å. In the second P site, P(2) is bonded to one C(4); one O(1,4); one O(5); and one O(6) atom to form distorted PCO3 tetrahedra that share  a cornercorner with one N(2)MnC3 tetrahedra. The P(2)-O(1,4) bond length is 1.50 Å. The P(2)-O(5) bond length is 1.50 Å. The P(2)-O(6) bond length is 1.50 Å. There are two inequivalent N sites. In the first N site, N(1) is bonded to one Mn(1), one C(1), one C(2), and one C(3) atom to form distorted NMnC3 tetrahedra that share  a cornercorner with one C(5)H2CN tetrahedra and  a cornercorner with one P(1)CO3 tetrahedra. In the second N site, N(2) is bonded to one Mn(2), one C(4), one C(5), and one C(6) atom to form distorted NMnC3 tetrahedra that share  a cornercorner with one C(2)H2CN tetrahedra and  a cornercorner with one P(2)CO3 tetrahedra. There are six inequivalent H sites. In the first H site, H(1,5) is bonded in a single-bond geometry to one C(2) atom. In the second H site, H(2,6) 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 Mn(1) and one C(3) 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(7) is bonded in a single-bond geometry to one C(6) atom. In the sixth H site, H(8) is bonded in a single-bond geometry to one C(6) atom. There are five inequivalent O sites. In the first O site, O(1,4) is bonded in a single-bond geometry to one P(1) atom. In the second O site, O(2) is bonded in a 3-coordinate geometry to two equivalent Mn(1) and one P(1) atom. In the third O site, O(3) is bonded in a 3-coordinate geometry to two equivalent Mn(1) and one P(1) atom. In the fourth O site, O(5) is bonded in a 3-coordinate geometry to two equivalent Mn(2) and one P(2) atom. In the fifth O site, O(6) is bonded in a 3-coordinate geometry to two equivalent Mn(2) and one P(2) atom. Linkers: 2 [O]P([O])[C]N1CCN([C]P([O])([O])=O)CC1 ,3 [O]P([O])(=O)[C]N1CCN([C]P([O])([O])=O)CC1. Metal clusters: 6 [Mn]. The MOF has largest included sphere 10.14 A, density 1.24 g/cm3, surface area 2924.97 m2/g, accessible volume 0.37 cm3/g