GaCP2H2O10 crystallizes in the monoclinic P2_1/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(6) atom to form GaO6 octahedra that share  a cornercorner with one P(2)O4 tetrahedra and corners with three equivalent P(1)O4 tetrahedra. The Ga(1)-O(1) bond length is 1.89 Å. The Ga(1)-O(2) bond length is 1.95 Å. The Ga(1)-O(3) bond length is 1.92 Å. The Ga(1)-O(4) bond length is 1.91 Å. The Ga(1)-O(5) bond length is 2.08 Å. The Ga(1)-O(6) bond length is 2.05 Å. In the second Ga site, Ga(2) is bonded to one O(11), one O(12), one O(13), one O(14), one O(15), and one O(8) atom to form GaO6 octahedra that share  a cornercorner with one P(2)O4 tetrahedra,  a cornercorner with one P(4)O5 tetrahedra, and corners with two equivalent P(3)O4 tetrahedra. The Ga(2)-O(11) bond length is 1.89 Å. The Ga(2)-O(12) bond length is 1.97 Å. The Ga(2)-O(13) bond length is 2.04 Å. The Ga(2)-O(14) bond length is 2.01 Å. The Ga(2)-O(15) bond length is 1.94 Å. The Ga(2)-O(8) bond length is 1.94 Å. There are two inequivalent C sites. In the first C site, C(1) is bonded in a distorted bent 120 degrees geometry to one O(13) and one O(5) atom. The C(1)-O(13) bond length is 1.24 Å. The C(1)-O(5) bond length is 1.25 Å. In the second C site, C(2) is bonded in a distorted bent 120 degrees geometry to one O(14) and one O(6) atom. The C(2)-O(14) bond length is 1.25 Å. The C(2)-O(6) bond length is 1.24 Å. There are four inequivalent P sites. In the first P site, P(1) is bonded to one O(1), one O(3), one O(4), and one O(7) atom to form PO4 tetrahedra that share corners with three equivalent Ga(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 26-45°. The P(1)-O(1) bond length is 1.51 Å. The P(1)-O(3) bond length is 1.52 Å. The P(1)-O(4) bond length is 1.53 Å. The P(1)-O(7) bond length is 1.56 Å. In the second P site, P(2) is bonded to one O(10), one O(2), one O(8), and one O(9) atom to form PO4 tetrahedra that share  a cornercorner with one Ga(1)O6 octahedra and  a cornercorner with one Ga(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 37-45°. The P(2)-O(10) bond length is 1.57 Å. The P(2)-O(2) bond length is 1.49 Å. The P(2)-O(8) bond length is 1.50 Å. The P(2)-O(9) bond length is 1.55 Å. In the third P site, P(3) is bonded to one O(11), one O(15), one O(16), and one O(17) atom to form PO4 tetrahedra that share corners with two equivalent Ga(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 40-42°. The P(3)-O(11) bond length is 1.51 Å. The P(3)-O(15) bond length is 1.54 Å. The P(3)-O(16) bond length is 1.56 Å. The P(3)-O(17) bond length is 1.49 Å. In the fourth P site, P(4) is bonded to one O(12), one O(19), one O(20), and two equivalent O(18) atoms to form distorted PO5 tetrahedra that share  a cornercorner with one Ga(2)O6 octahedra and  an edgeedge with one P(4)O5 tetrahedra. The corner-sharing octahedral tilt angles are 28°. The P(4)-O(12) bond length is 1.45 Å. The P(4)-O(19) bond length is 1.52 Å. The P(4)-O(20) bond length is 1.71 Å. There is one shorter (1.53 Å) and one longer (1.85 Å) P(4)-O(18) bond length. There are four inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one O(7) atom. The H(1)-O(7) bond length is 0.82 Å. In the second H site, H(2) is bonded in a single-bond geometry to one O(9) atom. The H(2)-O(9) bond length is 0.82 Å. In the third H site, H(3) is bonded in a single-bond geometry to one O(10) atom. The H(3)-O(10) bond length is 0.82 Å. In the fourth H site, H(4) is bonded in a single-bond geometry to one O(16) atom. The H(4)-O(16) bond length is 0.82 Å. There are twenty inequivalent O sites. In the first O site, O(1) is bonded in a bent 150 degrees geometry to one Ga(1) and one P(1) atom. In the second O site, O(2) is bonded in a bent 150 degrees geometry to one Ga(1) and one P(2) atom. In the third O site, O(3) is bonded in a bent 150 degrees geometry to one Ga(1) and one P(1) atom. In the fourth O site, O(4) is bonded in a distorted bent 150 degrees geometry to one Ga(1) and one P(1) atom. In the fifth O site, O(5) is bonded in a bent 120 degrees geometry to one Ga(1) and one C(1) atom. In the sixth O site, O(6) is bonded in a bent 120 degrees geometry to one Ga(1) and one C(2) atom. In the seventh O site, O(7) is bonded in a water-like geometry to one P(1) and one H(1) atom. In the eighth O site, O(8) is bonded in a distorted bent 150 degrees geometry to one Ga(2) and one P(2) atom. In the ninth O site, O(9) is bonded in a water-like geometry to one P(2) and one H(2) atom. In the tenth O site, O(10) is bonded in a water-like geometry to one P(2) and one H(3) atom. In the eleventh O site, O(11) is bonded in a bent 150 degrees geometry to one Ga(2) and one P(3) atom. In the twelfth O site, O(12) is bonded in a bent 150 degrees geometry to one Ga(2) and one P(4) atom. In the thirteenth O site, O(13) is bonded in a bent 120 degrees geometry to one Ga(2) and one C(1) atom. In the fourteenth O site, O(14) is bonded in a bent 120 degrees geometry to one Ga(2) and one C(2) atom. In the fifteenth O site, O(15) is bonded in a distorted bent 150 degrees geometry to one Ga(2) and one P(3) atom. In the sixteenth O site, O(16) is bonded in a water-like geometry to one P(3) and one H(4) atom. In the seventeenth O site, O(17) is bonded in a single-bond geometry to one P(3) atom. In the eighteenth O site, O(18) is bonded in a 3-coordinate geometry to two equivalent P(4) and one O(19) atom. The O(18)-O(19) bond length is 1.16 Å. In the nineteenth O site, O(19) is bonded in a distorted L-shaped geometry to one P(4) and one O(18) atom. In the twentieth O site, O(20) is bonded in a single-bond geometry to one P(4) atom. Linkers: 2 [O][P@]1(=O)OO[P@@]([O])(=O)OO1 ,4 [O]C(=O)C([O])=O. Metal clusters: 8 [Ga]. The MOF has largest included sphere 4.53 A, density 2.08 g/cm3, surface area 2589.87 m2/g, accessible volume 0.13 cm3/g