Be3(HPO3)4 crystallizes in the monoclinic P2_1/c space group. There are three inequivalent Be sites. In the first Be site, Be(1) is bonded to one O(12), one O(2), one O(4), and one O(7) atom to form BeO4 tetrahedra that share  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 Be(1)-O(12) bond length is 1.62 Å. The Be(1)-O(2) bond length is 1.59 Å. The Be(1)-O(4) bond length is 1.61 Å. The Be(1)-O(7) bond length is 1.62 Å. In the second Be site, Be(2) is bonded to one O(10), one O(3), one O(5), and one O(9) atom to form BeO4 tetrahedra that share  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 Be(2)-O(10) bond length is 1.62 Å. The Be(2)-O(3) bond length is 1.62 Å. The Be(2)-O(5) bond length is 1.62 Å. The Be(2)-O(9) bond length is 1.63 Å. In the third Be site, Be(3) is bonded to one O(1), one O(11), one O(6), and one O(8) atom to form BeO4 tetrahedra that share  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 Be(3)-O(1) bond length is 1.62 Å. The Be(3)-O(11) bond length is 1.63 Å. The Be(3)-O(6) bond length is 1.63 Å. The Be(3)-O(8) bond length is 1.61 Å. There are four inequivalent P sites. In the first P site, P(1) is bonded to one H(1), one O(1), one O(2), and one O(3) atom to form distorted PHO3 tetrahedra that share  a cornercorner with one Be(1)O4 tetrahedra,  a cornercorner with one Be(2)O4 tetrahedra, and  a cornercorner with one Be(3)O4 tetrahedra. The P(1)-H(1) bond length is 1.34 Å. The P(1)-O(1) bond length is 1.51 Å. The P(1)-O(2) bond length is 1.51 Å. The P(1)-O(3) bond length is 1.52 Å. In the second P site, P(2) is bonded to one H(2), one O(4), one O(5), and one O(6) atom to form PHO3 tetrahedra that share  a cornercorner with one Be(1)O4 tetrahedra,  a cornercorner with one Be(2)O4 tetrahedra, and  a cornercorner with one Be(3)O4 tetrahedra. The P(2)-H(2) bond length is 1.32 Å. The P(2)-O(4) bond length is 1.50 Å. The P(2)-O(5) bond length is 1.51 Å. The P(2)-O(6) bond length is 1.52 Å. In the third P site, P(3) is bonded to one H(3), one O(7), one O(8), and one O(9) atom to form PHO3 tetrahedra that share  a cornercorner with one Be(1)O4 tetrahedra,  a cornercorner with one Be(2)O4 tetrahedra, and  a cornercorner with one Be(3)O4 tetrahedra. The P(3)-H(3) bond length is 1.31 Å. The P(3)-O(7) bond length is 1.50 Å. The P(3)-O(8) bond length is 1.49 Å. The P(3)-O(9) bond length is 1.50 Å. In the fourth P site, P(4) is bonded to one H(4), one O(10), one O(11), and one O(12) atom to form PHO3 tetrahedra that share  a cornercorner with one Be(1)O4 tetrahedra,  a cornercorner with one Be(2)O4 tetrahedra, and  a cornercorner with one Be(3)O4 tetrahedra. The P(4)-H(4) bond length is 1.31 Å. The P(4)-O(10) bond length is 1.52 Å. The P(4)-O(11) bond length is 1.51 Å. The P(4)-O(12) bond length is 1.52 Å. There are four 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. There are twelve inequivalent O sites. In the first O site, O(1) is bonded in a bent 150 degrees geometry to one Be(3) and one P(1) atom. In the second O site, O(2) is bonded in a bent 150 degrees geometry to one Be(1) and one P(1) atom. In the third O site, O(3) is bonded in a bent 150 degrees geometry to one Be(2) and one P(1) atom. In the fourth O site, O(4) is bonded in a bent 150 degrees geometry to one Be(1) and one P(2) atom. In the fifth O site, O(5) is bonded in a bent 150 degrees geometry to one Be(2) and one P(2) atom. In the sixth O site, O(6) is bonded in a bent 150 degrees geometry to one Be(3) and one P(2) atom. In the seventh O site, O(7) is bonded in a bent 150 degrees geometry to one Be(1) and one P(3) atom. In the eighth O site, O(8) is bonded in a bent 150 degrees geometry to one Be(3) and one P(3) atom. In the ninth O site, O(9) is bonded in a bent 150 degrees geometry to one Be(2) and one P(3) atom. In the tenth O site, O(10) is bonded in a bent 150 degrees geometry to one Be(2) and one P(4) atom. In the eleventh O site, O(11) is bonded in a bent 120 degrees geometry to one Be(3) and one P(4) atom. In the twelfth O site, O(12) is bonded in a bent 150 degrees geometry to one Be(1) and one P(4) atom. Linkers: 16 [O][PH]([O])=O. Metal clusters: 12 [Be]. The MOF has largest included sphere 4.55 A, density 1.50 g/cm3, surface area 3478.59 m2/g, accessible volume 0.23 cm3/g