title: Preparation of manganese(II), chromium(III) and ferric(III) oxides nanoparticles in situ metal citraconate complexes frameworks.
abstract: The new reactions of some divalent and trivalent transition metal ions (Mn(II), Cr(III), and Fe(III)) with citraconic acid has been studied. The obtained results indicate the formation of citraconic acid compounds with molar ratio of metal to citraconic acid of 2:2 or 2:3 with general formulas Mn2(C5H4O4)2 or M2(C5H4O4)3⋅nH2O where n=6 for Cr, and Fe(III). The thermal decomposition of the crystalline solid complexes was investigated. The IR spectra of citraconate suggested that the carboxylic groups are bidentatically bridging and chelating. In the course of decomposition the complexes are dehydrated and then decompose either directly to oxides in only one step or with intermediate formation of oxocarbonates. This proposal dealing the preparation of MnO2, Fe2O3 and Cr2O3 nanoparticles. The crystalline structure of oxide products were checked by X-ray powder diffraction (XRD), and the morphology of particles by scanning electron microscopy (SEM).
authors: Chemistry Department, Faculty of Science, Taif University, P.O. Box 888, Al-Hawiah, Taif 21974, Saudi Arabia; Chemistry Department, Faculty of Science, Port Said University, Port Said, Egypt. Electronic address: msrefat@yahoo.com.
authors: Moamen S
authors: MS
authors: Refat
mesh_terms: D002614:Chelating Agents / Q000138:chemical synthesis / Q000737:chemistry; D002857:Chromium / Q000737:chemistry*; D056831:Coordination Complexes / Q000138:chemical synthesis / Q000737:chemistry*; D005290:Ferric Compounds / Q000138:chemical synthesis / Q000737:chemistry*; D005650:Fumarates / Q000138:chemical synthesis / Q000737:chemistry*; D008298:Maleates / Q000138:chemical synthesis / Q000737:chemistry*; D008345:Manganese / Q000737:chemistry*; D053758:Nanoparticles / Q000737:chemistry* / Q000648:ultrastructure; D014961:X-Ray Diffraction
chemical_list: D002614:Chelating Agents; D056831:Coordination Complexes; D005290:Ferric Compounds; D005650:Fumarates; D008298:Maleates; D002857:Chromium; C073341:citraconic acid; C000499:ferric oxide; D008345:Manganese
keywords: Chelation; Citraconic acid; Nanoparticles; Spectroscopy; Transition metal