La3P4(CO3)8 crystallizes in the orthorhombic Pbcn space group. There are two inequivalent La sites. In the first La site, La(1) is bonded in a 7-coordinate geometry to one O(1), one O(10), one O(12), one O(3), one O(4), one O(5), and one O(6) atom. The La(1)-O(1) bond length is 2.58 Å. The La(1)-O(10) bond length is 2.87 Å. The La(1)-O(12) bond length is 2.40 Å. The La(1)-O(3) bond length is 2.45 Å. The La(1)-O(4) bond length is 2.82 Å. The La(1)-O(5) bond length is 2.79 Å. The La(1)-O(6) bond length is 2.61 Å. In the second La site, La(2) is bonded in a rectangular see-saw-like geometry to two equivalent O(11) and two equivalent O(7) atoms. Both La(2)-O(11) bond lengths are 2.55 Å. Both La(2)-O(7) bond lengths are 2.53 Å. There are four inequivalent C sites. In the first C site, C(1) is bonded in a distorted water-like geometry to one C(2), one P(1), and one O(4) atom. The C(1)-C(2) bond length is 1.51 Å. The C(1)-P(1) bond length is 1.82 Å. The C(1)-O(4) bond length is 1.40 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 1.24 Å. The C(2)-O(6) bond length is 1.24 Å. In the third C site, C(3) is bonded in a 3-coordinate geometry to one C(4), one P(2), and one O(10) atom. The C(3)-C(4) bond length is 1.51 Å. The C(3)-P(2) bond length is 1.81 Å. The C(3)-O(10) bond length is 1.40 Å. In the fourth C site, C(4) is bonded in a distorted bent 120 degrees geometry to one C(3), one O(11), and one O(12) atom. The C(4)-O(11) bond length is 1.24 Å. The C(4)-O(12) bond length is 1.24 Å. There are two inequivalent P sites. In the first P site, P(1) is bonded in a 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 1.53 Å. The P(1)-O(2) bond length is 1.54 Å. The P(1)-O(3) bond length is 1.54 Å. In the second P site, P(2) is bonded in a tetrahedral geometry to one C(3), one O(7), one O(8), and one O(9) atom. The P(2)-O(7) bond length is 1.54 Å. The P(2)-O(8) bond length is 1.54 Å. The P(2)-O(9) bond length is 1.54 Å. There are twelve inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to one La(1) and one P(1) atom. In the second O site, O(2) is bonded in a single-bond geometry to one P(1) atom. In the third O site, O(3) is bonded in a distorted bent 150 degrees geometry to one La(1) and one P(1) atom. In the fourth O site, O(4) is bonded in a distorted water-like geometry to one La(1) and one C(1) atom. In the fifth O site, O(5) is bonded in a distorted bent 120 degrees geometry to one La(1) and one C(2) atom. In the sixth O site, O(6) is bonded in a distorted bent 120 degrees geometry to one La(1) and one C(2) atom. In the seventh O site, O(7) is bonded in a distorted bent 120 degrees geometry to one La(2) and one P(2) atom. In the eighth O site, O(8) is bonded in a single-bond geometry to one P(2) atom. In the ninth O site, O(9) is bonded in a single-bond geometry to one P(2) atom. In the tenth O site, O(10) is bonded in a single-bond geometry to one La(1) and one C(3) atom. In the eleventh O site, O(11) is bonded in a distorted bent 150 degrees geometry to one La(2) and one C(4) atom. In the twelfth O site, O(12) is bonded in a distorted bent 120 degrees geometry to one La(1) and one C(4) atom. Linkers: 16 [O][C](C([O])=O)P([O])([O])=O. Metal clusters: 12 [La]. The MOF has largest included sphere 6.42 A, density 1.71 g/cm3, surface area 2641.21 m2/g, accessible volume 0.29 cm3/g