SmC6P2NH12O11 crystallizes in the monoclinic P2_1/c space group. Sm(1) is bonded in a 8-coordinate geometry to one O(1), one O(10), one O(11), one O(3), one O(5), one O(7), one O(8), and one O(9) atom. The Sm(1)-O(1) bond length is 2.38 Å. The Sm(1)-O(10) bond length is 2.42 Å. The Sm(1)-O(11) bond length is 2.54 Å. The Sm(1)-O(3) bond length is 2.36 Å. The Sm(1)-O(5) bond length is 2.35 Å. The Sm(1)-O(7) bond length is 2.53 Å. The Sm(1)-O(8) bond length is 2.47 Å. The Sm(1)-O(9) bond length is 2.44 Å. There are six inequivalent C sites. In the first C site, C(1) is bonded to one P(1), one N(1), one H(5), and one H(6) atom to form distorted corner-sharing CPH2N tetrahedra. The C(1)-P(1) bond length is 1.84 Å. The C(1)-N(1) bond length is 1.50 Å. The C(1)-H(5) bond length is 1.10 Å. The C(1)-H(6) bond length is 1.10 Å. In the second C site, C(2) is bonded to one P(2), one N(1), one H(7), and one H(8) atom to form distorted corner-sharing CPH2N tetrahedra. The C(2)-P(2) bond length is 1.83 Å. The C(2)-N(1) bond length is 1.49 Å. The C(2)-H(7) bond length is 1.10 Å. The C(2)-H(8) bond length is 1.10 Å. In the third C site, C(3) is bonded in a 4-coordinate geometry to one C(4), one N(1), one H(10), and one H(9) atom. The C(3)-C(4) bond length is 1.51 Å. The C(3)-N(1) bond length is 1.50 Å. The C(3)-H(10) bond length is 1.10 Å. The C(3)-H(9) bond length is 1.10 Å. In the fourth C site, C(4) is bonded in a distorted trigonal non-coplanar geometry to one C(3), one H(11), one H(12), and one O(2) atom. The C(4)-H(11) bond length is 1.10 Å. The C(4)-H(12) bond length is 1.10 Å. The C(4)-O(2) bond length is 1.45 Å. In the fifth C site, C(5) is bonded in a distorted bent 120 degrees geometry to one O(7) and one O(8) atom. The C(5)-O(7) bond length is 1.28 Å. The C(5)-O(8) bond length is 1.26 Å. In the sixth C site, C(6) is bonded in a distorted bent 120 degrees geometry to one O(10) and one O(9) atom. The C(6)-O(10) bond length is 1.27 Å. The C(6)-O(9) bond length is 1.26 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 distorted PCO3 tetrahedra that share  a cornercorner with one N(1)HC3 tetrahedra. The P(1)-O(1) bond length is 1.50 Å. The P(1)-O(2) bond length is 1.62 Å. The P(1)-O(3) bond length is 1.50 Å. In the second P site, P(2) is bonded to one C(2), one O(4), one O(5), and one O(6) atom to form distorted PCO3 tetrahedra that share  a cornercorner with one N(1)HC3 tetrahedra. The P(2)-O(4) bond length is 1.51 Å. The P(2)-O(5) bond length is 1.50 Å. The P(2)-O(6) bond length is 1.62 Å. N(1) is bonded to one C(1), one C(2), one C(3), and one H(4) atom to form NHC3 tetrahedra that share  a cornercorner with one P(1)CO3 tetrahedra and  a cornercorner with one P(2)CO3 tetrahedra. The N(1)-H(4) bond length is 1.09 Å. There are twelve inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one O(6) atom. The H(1)-O(6) bond length is 0.98 Å. In the second H site, H(2) is bonded in a single-bond geometry to one O(11) atom. The H(2)-O(11) bond length is 1.00 Å. In the third H site, H(3) is bonded in a single-bond geometry to one O(11) atom. The H(3)-O(11) bond length is 0.98 Å. In the fourth H site, H(4) is bonded in a distorted linear geometry to one N(1) and one O(4) atom. The H(4)-O(4) bond length is 1.50 Å. In the fifth H site, H(5) is bonded in a single-bond geometry to one C(1) atom. In the sixth H site, H(6) is bonded in a single-bond geometry to one C(1) atom. In the seventh H site, H(7) is bonded in a single-bond geometry to one C(2) atom. In the eighth H site, H(8) is bonded in a single-bond geometry to one C(2) atom. In the ninth H site, H(9) is bonded in a single-bond geometry to one C(3) atom. In the tenth H site, H(10) is bonded in a single-bond geometry to one C(3) atom. In the eleventh H site, H(11) is bonded in a single-bond geometry to one C(4) atom. In the twelfth H site, H(12) is bonded in a single-bond geometry to one C(4) atom. There are eleven inequivalent O sites. In the first O site, O(11) is bonded in a distorted water-like geometry to one Sm(1), one H(2), and one H(3) atom. In the second O site, O(1) is bonded in a bent 150 degrees geometry to one Sm(1) and one P(1) atom. In the third O site, O(2) is bonded in a bent 120 degrees geometry to one C(4) and one P(1) atom. In the fourth O site, O(3) is bonded in a distorted bent 150 degrees geometry to one Sm(1) and one P(1) atom. In the fifth O site, O(4) is bonded in a bent 150 degrees geometry to one P(2) and one H(4) atom. In the sixth O site, O(5) is bonded in a distorted bent 150 degrees geometry to one Sm(1) and one P(2) atom. In the seventh O site, O(6) is bonded in a water-like geometry to one P(2) and one H(1) atom. In the eighth O site, O(7) is bonded in a distorted single-bond geometry to one Sm(1) and one C(5) atom. In the ninth O site, O(8) is bonded in a distorted bent 120 degrees geometry to one Sm(1) and one C(5) atom. In the tenth O site, O(9) is bonded in a distorted bent 120 degrees geometry to one Sm(1) and one C(6) atom. In the eleventh O site, O(10) is bonded in a distorted bent 120 degrees geometry to one Sm(1) and one C(6) atom. Linkers: 2 [O]P(=O)(C[NH]1CCO[P@](=O)(C1)[O])O ,4 [O]C(=O)C([O])=O ,2 [O]P(=O)(C[NH]1CCO[P@@](=O)(C1)[O])O. Metal clusters: 4 [Sm]. The MOF has largest included sphere 3.03 A, density 2.17 g/cm3, surface area 2869.72 m2/g, accessible volume 0.14 cm3/g