SYNTHESIS AND MAGNETIC PROPERTIES OF COMPLEXES OF A CONJUGATED HYPERBRANCHED POLYMER CONTAINING BITHIAZOLE RINGS

A novel conjugated hyperbranched polymer containing bithiazole rings (PBTADB) was synthesized by polycondensation of 1,3,5-benzenetricarboxaldehyde and 2,2-diamino-4,4-bithiazole (DABT). The structure of the hyperbranched polymer was confirmed by FT-IR and 1H-NMR. PBTADB dissolved in organic polar solvents such as DMSO and NMP. Bithiazole rings were introduced to provide bidentate N-donor sites for binding metal ions. The metal complexes were prepared by chelation of the polymer with Co2+ and Sm3+. The magnetic behavior of coordination compounds was measured as a function of magnetic field strength (0-4.8 106 A/m) at 5 K and as a function of temperature (5-300 K) at magnetic field strength of 2.4 106 A/m. The magnetic hysteresis loops of PBTADB-Sm3+ and PBTADB-Co2+ showed the typical S shape at 5 K with the Curie-Weiss temperature T= 96 K and 41 K respectively. The results show that they exhibit properties of soft ferromagnetic materials.