Synthesis, characterization and magnetic properties of a novel fluorinated iron phosphite Fe2(HPO3)F2 with infinite –Fe–F–Fe–O–Fe– linkage and –Fe–F–Fe– layer

A novel fluorinated iron phosphite Fe2(HPO3)F2 (1) has been hydrothermally synthesized and characterized by single-crystal X-ray diffraction. Compound 1 crystallizes in the orthorhombic space group Pnma (No. 51) with a = 7.3458(15) Å, b = 10.038(2) Å, c = 5.4947(11) Å, V = 405.16(14) Å3, Z = 4. Its structure is built up from iron(II) oxygen–fluorine FeO3F3 octahedra and HPO3 pseudo-tetrahedra, giving rise to a 3D inorganic framework. The infinite –Fe–O–Fe–F–Fe– linkage and –Fe–F–Fe– layer in the framework are the noteworthy structural features. Mössbauer spectrum shows the presence of Fe2+ in the octahedral coordination. Magnetic measurements indicate the existence of antiferromagnetic interactions.