Preparation Of Acrylamide-type Polymers With Pendent Thiazolyl Groups And The Magnetic Properties Of Their Metal Complexes

The development and status in quo of organic magnetic materials have been summarized in this paper. The main task has been proposed on the basis of the introduction, which including the synthesis of acrylamide-type polymers with pendent thiazolyl groups and their metal complexes, the relationship of their structures and magnetic properties. The aim of these studies is supposed to contribute to the theoretical research of organic magnetic materials.Two acrylamide-type monomers, N-2-thiazolylacrylamides (NTA) and N-2-th.iazolylmethacrylamides (NTMA), were synthesized and polymerized by a radical route to obtain the corresponding polymers in good yields. FTIR and ]H NMR were applied to characterize these materials. The Viscosity of the two polymers were also measured.These two acrylamide-type polymers reacted with transition metal ion Fe(II) and rare earth ions Nd(III), Pr(III), Sm(III) to produce 8 novel polymer-metal complexes. FTIR were applied to characterize their structure and the metal content was determined by complexometric titration.The magnetic properties of these polymer-metal complexes were measured by a PPMS-9T magnetometer (QUANTUM DESIGN), which include magnetization versus temperature, magnetization versus applied field, magnetic susceptibility versus temperature and magnetic hysteresis. The temperature is ranged from 4 to 300 K and the intensity of magnetic field is ranged from —50 to 50 kOe. According to the measurement it can be concluded that PolyNTA-Nd3+, PolyNTA-Pr3+ and PolyNTMA-Fe2+ were soft ferromagnet; PoIyNTA-Fe2+ and PolyNTMA-Pr3+ were antiferromagnet; PolyNTA-Sm3+, PolyNTMA-Nd3+and PolyNTMA-Sm3+ exhibited a special magnetic property: along with the decreasing of temperature, they changes from a diamagnet to ferromagnet with a certain transition temperature.At the end of this paper we designed a new bithiazole-containing monomer, 2,2'-diacrylamido-4,4'-bithiazole (DAABT). FTIR and lH NMR were used to confirm the structure of the monomer. It is supposed to possess greater coordinative ability compared with poly(N-2-thiazolyl(meth)acrylamides). We attempt to study the preparation of its polymer, but it is difficult for DAABT to be polymerized by a radical route.