Bithiazole based polymer and its ferro complex containing hexacyanoferrate(III) group: synthesis and ferromagnetic property

This paper describes the syntheses, structures and magnetic properties of novel bithiazole based polymeric complexes incorporating ferro ions and hexacyanoferrate groups. The polymer (referred to as SDP) is a condensed product, which obtained from the polycondensation of salicylic acid with 2,2′-diamino-4,4′-bithiazole (DABT) and paraformaldehyde. Its ferro-complex (SDP-Fe2+) reacted with potassium ferricyanide (K3[Fe(CN)6]) in DMSO, producing the polymeric–inorganic complex (SDP-Prussian blue). On the basis of preliminary characterization via spectroscopy techniques, reasonable structures have been proposed for these bithiazole based metallopolymers. The magnetic behavior of the polymeric complexes was measured as a function of magnetic field strength (0–60 kOe) at 5 K and as a function of temperature (5–300 K) at applied fields of 30 and 1000 Oe. SDP-Prussian blue exhibits a hysteresis cycle at 5 K, in which the observed coercive field (HC) is 40 Oe and the remnant magnetization (Mr) is 0.035 emu g−1. The results of measurements indicate that SDP-Fe2+ is an antiferromagnet, while SDP-Prussian blue shows a soft-ferromagnetic behavior.