SYNTHESIS, STRUCTURE AND PROPERTIES OF LAYERED IRON ORGANO PHOSPHATES

Iron organo phosphates such as iron octyl phosphate (FeOP) and iron phenyl phosphate (FePP) were synthesized by the reaction of FeCl3 and octyl phosphate (C8H17OPO3H2) or phenyl phosphate (C6H5OPO3H2) in aqueous media and were characterized by a variety of techniques. XRD pattern of FeOP showed five diffraction peaks at 3.3, 6.7, 10.0, 13.2 and 19.5°, and a halo. The d-spacing ratio of these peaks was almost 1 : 1/2 : 1/3 : 1/4 : 1/5. While, the pattern of FePP possessed a strong peak at 20 = 5.6° The chemical formula of FeOP and FePP assayed by ICP, CHN elemental analysis was Fe(OH)(C8H17OPO3H)2and Fe(OH)(C6H5OPO3H)1.6(H2PO4)0.4, respectively. From these facts,we can proposed that FeOP and FePP are composed of a multilayer alternating bimolecular layer of octyl or phenyl group and amorphous iron phosphate phases. UV-Vis spectra of these materials showed a strong absorption at ≥ 350 nm, meaning that the materials have a high absorption property in U V region.