BaPH3(CO3)2 crystallizes in the triclinic P-1 space group. Ba(1) is bonded in a 11-coordinate geometry to one H(1), one O(1), one O(4), two equivalent O(2), two equivalent O(3), two equivalent O(5), and two equivalent O(6) atoms. The Ba(1)-H(1) bond length is 2.96 Å. The Ba(1)-O(1) bond length is 3.14 Å. The Ba(1)-O(4) bond length is 2.79 Å. There is one shorter (2.69 Å) and one longer (2.84 Å) Ba(1)-O(2) bond length. There is one shorter (2.81 Å) and one longer (3.16 Å) Ba(1)-O(3) bond length. There is one shorter (2.83 Å) and one longer (2.91 Å) Ba(1)-O(5) bond length. There is one shorter (2.77 Å) and one longer (3.11 Å) Ba(1)-O(6) bond length. There are two inequivalent C sites. In the first C site, C(1) is bonded in a 4-coordinate geometry to one C(2), one P(1), one H(3), and one O(4) atom. The C(1)-C(2) bond length is 1.53 Å. The C(1)-P(1) bond length is 1.86 Å. The C(1)-H(3) bond length is 1.10 Å. The C(1)-O(4) bond length is 1.42 Å. In the second C site, C(2) is bonded in a distorted bent 120 degrees geometry to one C(1), one O(5), and one O(6) atom. The C(2)-O(5) bond length is 1.29 Å. The C(2)-O(6) bond length is 1.25 Å. P(1) is bonded in a distorted tetrahedral geometry to one C(1), one O(1), one O(2), and one O(3) atom. The P(1)-O(1) bond length is 1.59 Å. The P(1)-O(2) bond length is 1.52 Å. The P(1)-O(3) bond length is 1.53 Å. There are three inequivalent H sites. In the first H site, H(1) is bonded in a distorted bent 150 degrees geometry to one Ba(1), one O(1), and one O(3) atom. The H(1)-O(1) bond length is 1.03 Å. The H(1)-O(3) bond length is 1.54 Å. In the second H site, H(2) is bonded in a single-bond geometry to one O(4) atom. The H(2)-O(4) bond length is 1.00 Å. In the third H site, H(3) is bonded in a single-bond geometry to one C(1) atom. There are six inequivalent O sites. In the first O site, O(1) is bonded in a distorted bent 120 degrees geometry to one Ba(1), one P(1), and one H(1) atom. In the second O site, O(2) is bonded in a distorted single-bond geometry to two equivalent Ba(1) and one P(1) atom. In the third O site, O(3) is bonded in a distorted bent 150 degrees geometry to two equivalent Ba(1), one P(1), and one H(1) atom. In the fourth O site, O(4) is bonded in a distorted water-like geometry to one Ba(1), one C(1), and one H(2) atom. In the fifth O site, O(5) is bonded in a distorted single-bond geometry to two equivalent Ba(1) and one C(2) atom. In the sixth O site, O(6) is bonded in a distorted single-bond geometry to two equivalent Ba(1) and one C(2) atom. Linkers: 1 [O]C(=O)[C@@H](O)P([O])(=O)O ,1 [O]C(=O)[C@H](O)P([O])(=O)O. Metal clusters: 2 [Ba]. The MOF has largest included sphere 1.50 A, density 3.33 g/cm3, surface area 1796.71 m2/g, accessible volume 0.02 cm3/g