Hydrothermal synthesis and structure of Fe(NH3)(2)PO4: A novel monophosphate

Fe(NH3)(2)PO4 is synthesized under mild hydrothermal conditions in the pres ence of urea. The crystal structure is solved fur powder X-ray diffraction data. The unit cell is orthorhombic, a = 10.1058(2) Angstrom, b = 6.3676(2) Angstrom, c 7.5714(2) Angstrom, space group Pnma, Z = 4. The structure con sists of a three-dimensional network of FeO4N2 octahedra and PO4 tetrahedra linked by vertex sharing. Two crystallographically independent ammonia mol ecules are linked to the iron atom. This compound is the first three-dimens ional solid structurally characterized containing Fe-NH3 bonds.