FePO4 crystallizes in the tetragonal I-42m space group. Fe(1) is bonded to one O(2), one O(3), and two equivalent O(1) atoms to form FeO4 trigonal pyramids that share corners with four equivalent P(1)O4 tetrahedra. The Fe(1)-O(2) bond length is 2.00 Å. The Fe(1)-O(3) bond length is 1.94 Å. Both Fe(1)-O(1) bond lengths are 1.93 Å. P(1) is bonded to one O(2), one O(3), and two equivalent O(1) atoms to form PO4 tetrahedra that share corners with four equivalent Fe(1)O4 trigonal pyramids. The P(1)-O(2) bond length is 1.50 Å. The P(1)-O(3) bond length is 1.50 Å. Both P(1)-O(1) bond lengths are 1.51 Å. There are three inequivalent O sites. In the first O site, O(1) is bonded in a distorted bent 120 degrees geometry to one Fe(1) and one P(1) atom. In the second O site, O(2) is bonded in a distorted bent 120 degrees geometry to one Fe(1) and one P(1) atom. In the third O site, O(3) is bonded in a distorted linear geometry to one Fe(1) and one P(1) atom. Linkers: 8 [O]P([O])([O])=O. Metal clusters: 8 [Fe]. The MOF has largest included sphere 4.43 A, density 1.96 g/cm3, surface area 2197.33 m2/g, accessible volume 0.22 cm3/g