Ferromagnetic interactions above room temperature in a Schiff-base metal-organic polymer

摘要

The magnetic properties of an iron-bonded Schiff base polymer of general formula {[Fe(C13H17N3)2]SO4.6H2O}n are reported. Mössbauer spectroscopy shows that the polymer contains about 20±8 % of Fe3+ ions, despite the fact that only Fe2+ is used in the synthesis. A large out-of-phase component of the a.c. magnetic susceptibility is observed at zero external magnetic field and temperatures as high as 350 K. This result is characteristic of the presence of net magnetic moments in the material. The saturation magnetization is estimated to correspond to a saturation magnetic moment of 0.10 μB per structural repeating unit of the polymer.