Ga4P4HO17 crystallizes in the triclinic P-1 space group. There are four inequivalent Ga sites. In the first Ga site, Ga(1) is bonded to one O(11), one O(3), one O(5), one O(6), and one O(9) atom to form GaO5 trigonal bipyramids that share corners with two equivalent Ga(4)O6 octahedra,  a cornercorner with one P(1)O4 tetrahedra,  a cornercorner with one P(2)O4 tetrahedra,  a cornercorner with one P(3)O4 tetrahedra, and  a cornercorner with one P(4)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 56-58°. The Ga(1)-O(11) bond length is 1.84 Å. The Ga(1)-O(3) bond length is 1.86 Å. The Ga(1)-O(5) bond length is 1.92 Å. The Ga(1)-O(6) bond length is 1.85 Å. The Ga(1)-O(9) bond length is 2.14 Å. In the second Ga site, Ga(2) is bonded to one O(12), one O(15), one O(2), and one O(4) atom to form GaO4 tetrahedra that share  a cornercorner with one P(2)O4 tetrahedra,  a cornercorner with one P(4)O4 tetrahedra, and corners with two equivalent P(1)O4 tetrahedra. The Ga(2)-O(12) bond length is 1.84 Å. The Ga(2)-O(15) bond length is 1.82 Å. The Ga(2)-O(2) bond length is 1.80 Å. The Ga(2)-O(4) bond length is 1.80 Å. In the third Ga site, Ga(3) is bonded to one O(13), one O(14), one O(17), and one O(8) atom to form GaO4 tetrahedra that share  a cornercorner with one P(1)O4 tetrahedra,  a cornercorner with one P(4)O4 tetrahedra, and corners with two equivalent P(3)O4 tetrahedra. The Ga(3)-O(13) bond length is 1.82 Å. The Ga(3)-O(14) bond length is 1.82 Å. The Ga(3)-O(17) bond length is 1.81 Å. The Ga(3)-O(8) bond length is 1.79 Å. In the fourth Ga site, Ga(4) is bonded to one O(1), one O(10), one O(16), one O(7), and two equivalent O(9) atoms to form GaO6 octahedra that share  a cornercorner with one P(3)O4 tetrahedra,  a cornercorner with one P(4)O4 tetrahedra, corners with two equivalent P(2)O4 tetrahedra, corners with two equivalent Ga(1)O5 trigonal bipyramids, and  an edgeedge with one Ga(4)O6 octahedra. The Ga(4)-O(1) bond length is 1.93 Å. The Ga(4)-O(10) bond length is 1.96 Å. The Ga(4)-O(16) bond length is 1.91 Å. The Ga(4)-O(7) bond length is 1.91 Å. There is one shorter (2.05 Å) and one longer (2.08 Å) Ga(4)-O(9) bond length. There are four inequivalent P sites. In the first P site, P(1) is bonded to one O(14), one O(15), one O(4), and one O(5) atom to form PO4 tetrahedra that share  a cornercorner with one Ga(3)O4 tetrahedra, corners with two equivalent Ga(2)O4 tetrahedra, and  a cornercorner with one Ga(1)O5 trigonal bipyramid. The P(1)-O(14) bond length is 1.53 Å. The P(1)-O(15) bond length is 1.55 Å. The P(1)-O(4) bond length is 1.53 Å. The P(1)-O(5) bond length is 1.50 Å. In the second P site, P(2) is bonded to one O(1), one O(10), one O(2), and one O(6) atom to form PO4 tetrahedra that share corners with two equivalent Ga(4)O6 octahedra,  a cornercorner with one Ga(2)O4 tetrahedra, and  a cornercorner with one Ga(1)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles range from 55-56°. The P(2)-O(1) bond length is 1.52 Å. The P(2)-O(10) bond length is 1.53 Å. The P(2)-O(2) bond length is 1.53 Å. The P(2)-O(6) bond length is 1.55 Å. In the third P site, P(3) is bonded to one O(11), one O(17), one O(7), and one O(8) atom to form PO4 tetrahedra that share  a cornercorner with one Ga(4)O6 octahedra, corners with two equivalent Ga(3)O4 tetrahedra, and  a cornercorner with one Ga(1)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles are 43°. The P(3)-O(11) bond length is 1.52 Å. The P(3)-O(17) bond length is 1.55 Å. The P(3)-O(7) bond length is 1.51 Å. The P(3)-O(8) bond length is 1.52 Å. In the fourth P site, P(4) is bonded to one O(12), one O(13), one O(16), and one O(3) atom to form PO4 tetrahedra that share  a cornercorner with one Ga(4)O6 octahedra,  a cornercorner with one Ga(2)O4 tetrahedra,  a cornercorner with one Ga(3)O4 tetrahedra, and  a cornercorner with one Ga(1)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles are 47°. The P(4)-O(12) bond length is 1.53 Å. The P(4)-O(13) bond length is 1.54 Å. The P(4)-O(16) bond length is 1.50 Å. The P(4)-O(3) bond length is 1.53 Å. H(1) is bonded in a single-bond geometry to one O(9) atom. The H(1)-O(9) bond length is 0.97 Å. There are seventeen inequivalent O sites. In the first O site, O(1) is bonded in a bent 120 degrees geometry to one Ga(4) and one P(2) atom. In the second O site, O(2) is bonded in a bent 150 degrees geometry to one Ga(2) and one P(2) atom. In the third O site, O(3) is bonded in a distorted bent 120 degrees geometry to one Ga(1) and one P(4) atom. In the fourth O site, O(4) is bonded in a bent 150 degrees geometry to one Ga(2) 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 P(1) atom. In the sixth O site, O(6) is bonded in a bent 120 degrees geometry to one Ga(1) and one P(2) atom. In the seventh O site, O(7) is bonded in a distorted bent 150 degrees geometry to one Ga(4) and one P(3) atom. In the eighth O site, O(8) is bonded in a bent 150 degrees geometry to one Ga(3) and one P(3) atom. In the ninth O site, O(9) is bonded in a distorted single-bond geometry to one Ga(1), two equivalent Ga(4), and one H(1) atom. In the tenth O site, O(10) is bonded in a bent 120 degrees geometry to one Ga(4) and one P(2) atom. In the eleventh O site, O(11) is bonded in a bent 150 degrees geometry to one Ga(1) 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 150 degrees geometry to one Ga(3) and one P(4) atom. In the fourteenth O site, O(14) is bonded in a bent 120 degrees geometry to one Ga(3) and one P(1) atom. In the fifteenth O site, O(15) is bonded in a distorted bent 120 degrees geometry to one Ga(2) and one P(1) atom. In the sixteenth O site, O(16) is bonded in a distorted bent 120 degrees geometry to one Ga(4) and one P(4) atom. In the seventeenth O site, O(17) is bonded in a bent 150 degrees geometry to one Ga(3) and one P(3) atom. Linkers: 2 [OH] ,8 [O]P([O])([O])=O. Metal clusters: 8 [Ga]. The MOF has largest included sphere 4.91 A, density 2.41 g/cm3, surface area 2044.48 m2/g, accessible volume 0.17 cm3/g