Fe(III)-containing mesoporous poly-(p-phenylenediamine): Synthesis, characterization and magnetic properties

A new mesoporous polymer constituting of Fe(III)-poly-(p-phenylenediamine) (Fe-MPPD) has been synthesized by using the supramolecular assembly of anionic surfactant sodium dodecylsulphate (SDS) as template under mild conditions. The polymeric framework resulted via simultaneous oxidative polymerization of p-phenylenediamine (PPD) and cross-linking in the presence of Fe(III) ion using water as reaction medium. Upon removal of template SDS molecules through solvent extraction this material has retained the 2D-hexagonal nanostructure. The presence of Fe(III) in the polymeric material has been confirmed by atomic absorption spectroscopy (AAS, 18.3 and 10.2 wt% for two samples) and 57Fe Mössbauer spectroscopy. The temperature dependence of zero-field cooled magnetization showed spin freezing temperature at 3.5 K, below which there is a large coercivity due to significant contribution of surface anisotropy. The porosity and the magnetic property of the material are found to be dependent on the molar ratio Fe(III):PPD and SDA content.

Fe(III)-containing new mesoporous polymer (Fe-MPPD) has been synthesized through simultaneous oxidative polymerization of p-phenylenediamine (PPD) and cross-linking via Fe3+ coordination in the presence of an anionic surfactant SDS as template and this material showed large magnetic anisotropy.Figure optionsDownload as PowerPoint slideResearch highlights
► Polymerization of p-phenylenediamine in the presence of surfactant.
► New Fe(III)-containing mesoporous polymer Fe-MPPD.
► Mesoporous Fe3+ coordinated cross-linked polymer.
► Mesophase and surface area for Fe-MPPD.
► Magnetic anisotropy in Fe(III)-containing porous coordination polymer.