Synthesis of poly(thiazole-2,4-diyl)-rare-earth complexes and their magnetic properties

The synthesis of π-conjugated poly(thiazole-2,4-diyl) (PTz) and its complexes incorporating lanthanide ions in the main chain (PTz–Nd 3+ , PTz–Gd 3+ ) is described for the first time. FT-IR, 1 H NMR, and elemental analysis were used to study the structure of the obtained materials. The magnetic properties of the polymeric complexes were measured as a function of temperature (3–300 K) under an applied magnetic field of 30 kOe, and the results indicated that there are ferromagnetic interactions between the metal ions. The complexes PTz–Nd 3+ and PTz–Gd 3+ have the Curie–Weiss temperature of 254 and 28 K, respectively. Both polymeric complexes exhibited a hysteresis loop at 5 K, the coercive field and remanence magnetization is, respectively, 51.4 Oe and 0.0033 emu/g for PTz–Nd 3+ ; while corresponding values are 26.1 Oe and 0.018 emu/g for gadolinium complex.