MAGNETIC-PROPERTIES OF DOPED POLYANILINE WITH TETRACHLOFERRATE COUNTERIONS

The structure of doped polyaniline (PANI) with FeCl4- counter-ions was characterized by elemental analysis, FTIR, XPS and X-ray diffraction, and its magnetic properties were investigated by ESR, Mossbauer and m agnetization measurements. The temperature dependence of the magnetic susceptibility (chi) of doped PANI-FeCl4- exhibits a Cuire-Weiss law w ith a negative Weiss constant (theta = -2.61 K). This suggests that an antiferromagnetic interaction iri doped PANI-FeCl4- is taking place. It may be due to an interaction between the d-electrons of the ions an d pi-electrons of the PANI polymer chain.