SYNTHESIS, STRUCTURE AND PROPERTIES OF LAYERED IRON ORGANO PHOSPHATES

Abstract

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.