Ferromagnetism in poly(N-perfluorophenylpyrrole)

•We synthesized a new conducting polymer poly(N-perfluorophenylpyrrole).•By the ZFC–FC and EPR methods we measured magnetic properties of the prepared polymer.•We discussed stability and interactions of the polarons in triplet states.•At low temperatures the synthesized polymer reached ferromagnetism.

Magnetic properties of the synthesized poly(N-perfluorophenylpyrrole) were studied. The synthesized polymer dissolves in common organic solvents. By the zero-field cooling-field cooling method (ZFC–FC) we found that at low temperatures (Tb<50 K) the synthetic polymer reaches a state with prevailing ferromagnetism. The synthesized polymer retained ferromagnetism even at 300 K. The anomalous magnetic behavior was explained in terms of spin–spin interaction of triplet polarons. As can be seen from the calculated spin density of SOMO and SOMO 1 such a state arise as a consequence of 1-D spin interactions of polarons. Based on the calculated and visualized spin density (SOMO) on the polymer chain such interactions can be explained by the theory of flat-band-ferromagnetism.