Ga2P3(H2O5)2 crystallizes in the monoclinic P2_1/c space group. There are four 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 Ga(2)O5 square pyramid,  a cornercorner with one P(1)HO3 tetrahedra,  a cornercorner with one P(3)HO3 tetrahedra,  a cornercorner with one P(5)HO3 tetrahedra, and corners with two equivalent P(2)HO3 tetrahedra. The Ga(1)-O(1) bond length is 1.94 Å. The Ga(1)-O(2) bond length is 1.98 Å. The Ga(1)-O(3) bond length is 1.98 Å. The Ga(1)-O(4) bond length is 1.94 Å. The Ga(1)-O(5) bond length is 2.01 Å. The Ga(1)-O(6) bond length is 2.01 Å. In the second Ga site, Ga(2) is bonded to one O(1), one O(10), one O(7), one O(8), and one O(9) atom to form GaO5 square pyramids that share  a cornercorner with one Ga(1)O6 octahedra,  a cornercorner with one P(1)HO3 tetrahedra,  a cornercorner with one P(2)HO3 tetrahedra,  a cornercorner with one P(3)HO3 tetrahedra, and  a cornercorner with one P(4)HO3 tetrahedra. The corner-sharing octahedral tilt angles are 50°. The Ga(2)-O(1) bond length is 1.94 Å. The Ga(2)-O(10) bond length is 1.97 Å. The Ga(2)-O(7) bond length is 1.94 Å. The Ga(2)-O(8) bond length is 1.95 Å. The Ga(2)-O(9) bond length is 1.93 Å. In the third Ga site, Ga(3) is bonded to one O(11), one O(12), one O(13), one O(14), one O(15), and one O(16) atom to form GaO6 octahedra that share  a cornercorner with one Ga(4)O5 square pyramid,  a cornercorner with one P(1)HO3 tetrahedra,  a cornercorner with one P(4)HO3 tetrahedra,  a cornercorner with one P(5)HO3 tetrahedra, and corners with two equivalent P(6)HO3 tetrahedra. The Ga(3)-O(11) bond length is 1.95 Å. The Ga(3)-O(12) bond length is 1.97 Å. The Ga(3)-O(13) bond length is 1.99 Å. The Ga(3)-O(14) bond length is 2.00 Å. The Ga(3)-O(15) bond length is 1.94 Å. The Ga(3)-O(16) bond length is 1.97 Å. In the fourth Ga site, Ga(4) is bonded to one O(11), one O(17), one O(18), one O(19), and one O(20) atom to form GaO5 square pyramids that share  a cornercorner with one Ga(3)O6 octahedra,  a cornercorner with one P(3)HO3 tetrahedra,  a cornercorner with one P(4)HO3 tetrahedra,  a cornercorner with one P(5)HO3 tetrahedra, and  a cornercorner with one P(6)HO3 tetrahedra. The corner-sharing octahedral tilt angles are 50°. The Ga(4)-O(11) bond length is 1.91 Å. The Ga(4)-O(17) bond length is 1.93 Å. The Ga(4)-O(18) bond length is 1.93 Å. The Ga(4)-O(19) bond length is 1.95 Å. The Ga(4)-O(20) bond length is 1.93 Å. There are six inequivalent P sites. In the first P site, P(1) is bonded to one H(1), one O(12), one O(2), and one O(7) atom to form PHO3 tetrahedra that share  a cornercorner with one Ga(1)O6 octahedra,  a cornercorner with one Ga(3)O6 octahedra, and  a cornercorner with one Ga(2)O5 square pyramid. The corner-sharing octahedral tilt angles range from 39-51°. The P(1)-H(1) bond length is 1.25 Å. The P(1)-O(12) bond length is 1.51 Å. The P(1)-O(2) bond length is 1.53 Å. The P(1)-O(7) bond length is 1.53 Å. In the second P site, P(2) is bonded to one H(2), one O(3), one O(5), and one O(8) atom to form distorted PHO3 tetrahedra that share corners with two equivalent Ga(1)O6 octahedra and  a cornercorner with one Ga(2)O5 square pyramid. The corner-sharing octahedral tilt angles range from 44-47°. The P(2)-H(2) bond length is 1.51 Å. The P(2)-O(3) bond length is 1.52 Å. The P(2)-O(5) bond length is 1.52 Å. The P(2)-O(8) bond length is 1.51 Å. In the third P site, P(3) is bonded to one H(3), one O(10), one O(18), and one O(4) atom to form PHO3 tetrahedra that share  a cornercorner with one Ga(1)O6 octahedra,  a cornercorner with one Ga(2)O5 square pyramid, and  a cornercorner with one Ga(4)O5 square pyramid. The corner-sharing octahedral tilt angles are 27°. The P(3)-H(3) bond length is 1.32 Å. The P(3)-O(10) bond length is 1.51 Å. The P(3)-O(18) bond length is 1.53 Å. The P(3)-O(4) bond length is 1.51 Å. In the fourth P site, P(4) is bonded to one H(4), one O(15), one O(19), and one O(9) atom to form distorted PHO3 tetrahedra that share  a cornercorner with one Ga(3)O6 octahedra,  a cornercorner with one Ga(2)O5 square pyramid, and  a cornercorner with one Ga(4)O5 square pyramid. The corner-sharing octahedral tilt angles are 48°. The P(4)-H(4) bond length is 1.40 Å. The P(4)-O(15) bond length is 1.52 Å. The P(4)-O(19) bond length is 1.53 Å. The P(4)-O(9) bond length is 1.52 Å. In the fifth P site, P(5) is bonded to one H(5), one O(13), one O(17), and one O(6) atom to form PHO3 tetrahedra that share  a cornercorner with one Ga(1)O6 octahedra,  a cornercorner with one Ga(3)O6 octahedra, and  a cornercorner with one Ga(4)O5 square pyramid. The corner-sharing octahedral tilt angles range from 44-49°. The P(5)-H(5) bond length is 1.24 Å. The P(5)-O(13) bond length is 1.52 Å. The P(5)-O(17) bond length is 1.53 Å. The P(5)-O(6) bond length is 1.53 Å. In the sixth P site, P(6) is bonded to one H(6), one O(14), one O(16), and one O(20) atom to form distorted PHO3 tetrahedra that share corners with two equivalent Ga(3)O6 octahedra and  a cornercorner with one Ga(4)O5 square pyramid. The corner-sharing octahedral tilt angles range from 39-48°. The P(6)-H(6) bond length is 1.46 Å. The P(6)-O(14) bond length is 1.51 Å. The P(6)-O(16) bond length is 1.52 Å. The P(6)-O(20) bond length is 1.51 Å. There are eight inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one P(1) atom. In the second H site, H(2) is bonded in a single-bond geometry to one P(2) atom. In the third H site, H(3) is bonded in a single-bond geometry to one P(3) atom. In the fourth H site, H(4) is bonded in a single-bond geometry to one P(4) atom. In the fifth H site, H(5) is bonded in a single-bond geometry to one P(5) atom. In the sixth H site, H(6) is bonded in a single-bond geometry to one P(6) atom. In the seventh H site, H(7) is bonded in a single-bond geometry to one O(1) atom. The H(7)-O(1) bond length is 0.83 Å. In the eighth H site, H(8) is bonded in a single-bond geometry to one O(11) atom. The H(8)-O(11) bond length is 0.85 Å. There are twenty inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to one Ga(1), one Ga(2), and one H(7) atom. In the second O site, O(2) is bonded in a bent 120 degrees geometry to one Ga(1) and one P(1) atom. In the third O site, O(3) is bonded in a distorted bent 120 degrees geometry to one Ga(1) and one P(2) atom. In the fourth O site, O(4) is bonded in a bent 150 degrees geometry to one Ga(1) and one P(3) atom. In the fifth O site, O(5) is bonded in a distorted bent 150 degrees geometry to one Ga(1) and one P(2) atom. In the sixth O site, O(6) is bonded in a distorted bent 120 degrees geometry to one Ga(1) and one P(5) atom. In the seventh O site, O(7) is bonded in a distorted bent 150 degrees geometry to one Ga(2) and one P(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 bent 150 degrees geometry to one Ga(2) and one P(4) atom. In the tenth O site, O(10) is bonded in a bent 150 degrees geometry to one Ga(2) and one P(3) atom. In the eleventh O site, O(11) is bonded in a distorted single-bond geometry to one Ga(3), one Ga(4), and one H(8) atom. In the twelfth O site, O(12) is bonded in a bent 150 degrees geometry to one Ga(3) and one P(1) atom. In the thirteenth O site, O(13) is bonded in a distorted bent 150 degrees geometry to one Ga(3) and one P(5) atom. In the fourteenth O site, O(14) is bonded in a bent 150 degrees geometry to one Ga(3) and one P(6) atom. In the fifteenth O site, O(15) is bonded in a distorted bent 120 degrees geometry to one Ga(3) and one P(4) atom. In the sixteenth O site, O(16) is bonded in a distorted bent 120 degrees geometry to one Ga(3) and one P(6) atom. In the seventeenth O site, O(17) is bonded in a distorted bent 150 degrees geometry to one Ga(4) and one P(5) atom. In the eighteenth O site, O(18) is bonded in a bent 150 degrees geometry to one Ga(4) and one P(3) atom. In the nineteenth O site, O(19) is bonded in a bent 150 degrees geometry to one Ga(4) and one P(4) atom. In the twentieth O site, O(20) is bonded in a distorted bent 150 degrees geometry to one Ga(4) and one P(6) atom. Linkers: 20 [O][PH]([O])=O ,4 [O]P([O])[O] ,8 [OH]. Metal clusters: 16 [Ga]. The MOF has largest included sphere 4.32 A, density 2.25 g/cm3, surface area 2514.55 m2/g, accessible volume 0.17 cm3/g