Ga4P5(CO12)2 crystallizes in the monoclinic C2/c space group. There are two inequivalent Ga sites. In the first Ga site, Ga(1) is bonded to one O(1), one O(2), one O(3), one O(4), one O(5), and one O(7) atom to form GaO6 octahedra that share  a cornercorner with one P(2)O4 tetrahedra,  a cornercorner with one P(3)O4 tetrahedra, and corners with two equivalent P(1)O4 tetrahedra. The Ga(1)-O(1) bond length is 2.08 Å. The Ga(1)-O(2) bond length is 2.05 Å. The Ga(1)-O(3) bond length is 1.92 Å. The Ga(1)-O(4) bond length is 1.94 Å. The Ga(1)-O(5) bond length is 1.92 Å. The Ga(1)-O(7) bond length is 1.94 Å. In the second Ga site, Ga(2) is bonded to one O(10), one O(6), one O(8), and one O(9) atom to form GaO4 tetrahedra that share corners with two equivalent P(1)O4 tetrahedra and corners with two equivalent P(2)O4 tetrahedra. The Ga(2)-O(10) bond length is 1.81 Å. The Ga(2)-O(6) bond length is 1.81 Å. The Ga(2)-O(8) bond length is 1.81 Å. The Ga(2)-O(9) bond length is 1.81 Å. C(1) is bonded in a distorted bent 120 degrees geometry to one O(1) and one O(2) atom. The C(1)-O(1) bond length is 1.24 Å. The C(1)-O(2) bond length is 1.27 Å. There are three inequivalent P sites. In the first P site, P(1) is bonded to one O(5), one O(6), one O(7), and one O(8) atom to form PO4 tetrahedra that share corners with two equivalent Ga(1)O6 octahedra and corners with two equivalent Ga(2)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 29-43°. The P(1)-O(5) bond length is 1.51 Å. The P(1)-O(6) bond length is 1.54 Å. The P(1)-O(7) bond length is 1.51 Å. The P(1)-O(8) bond length is 1.54 Å. In the second P site, P(2) is bonded to one O(10), one O(11), one O(4), and one O(9) atom to form PO4 tetrahedra that share  a cornercorner with one Ga(1)O6 octahedra and corners with two equivalent Ga(2)O4 tetrahedra. The corner-sharing octahedral tilt angles are 35°. The P(2)-O(10) bond length is 1.53 Å. The P(2)-O(11) bond length is 1.51 Å. The P(2)-O(4) bond length is 1.50 Å. The P(2)-O(9) bond length is 1.53 Å. In the third P site, P(3) is bonded to two equivalent O(12) and two equivalent O(3) atoms to form PO4 tetrahedra that share corners with two equivalent Ga(1)O6 octahedra. The corner-sharing octahedral tilt angles are 37°. Both P(3)-O(12) bond lengths are 1.53 Å. Both P(3)-O(3) bond lengths are 1.51 Å. There are twelve inequivalent O sites. In the first O site, O(1) is bonded in a water-like geometry to one Ga(1) and one C(1) atom. In the second O site, O(2) is bonded in a bent 120 degrees geometry to one Ga(1) and one C(1) atom. In the third O site, O(3) is bonded in a bent 150 degrees geometry to one Ga(1) and one P(3) atom. In the fourth O site, O(4) is bonded in a bent 150 degrees geometry to one Ga(1) and one P(2) atom. In the fifth O site, O(5) is bonded in a bent 150 degrees geometry to one Ga(1) and one P(1) atom. In the sixth O site, O(6) is bonded in a bent 120 degrees geometry to one Ga(2) and one P(1) atom. In the seventh O site, O(7) is bonded in a distorted bent 150 degrees geometry to one Ga(1) and one P(1) atom. In the eighth O site, O(8) is bonded in a distorted bent 120 degrees geometry to one Ga(2) and one P(1) atom. In the ninth O site, O(9) is bonded in a bent 120 degrees geometry to one Ga(2) and one P(2) atom. In the tenth O site, O(10) is bonded in a distorted bent 150 degrees geometry to one Ga(2) and one P(2) atom. In the eleventh O site, O(11) is bonded in a single-bond geometry to one P(2) atom. In the twelfth O site, O(12) is bonded in a single-bond geometry to one P(3) atom. Linkers: 4 [O]C(=O)C([O])=O. Metal clusters: 16 [Ga]. The MOF has largest included sphere 5.61 A, density 2.03 g/cm3, surface area 2331.68 m2/g, accessible volume 0.20 cm3/g