The synthesis of six novel poly(schiff-base)s

such as PBTGZ

which is obtained by polycondensation of 2

4-diamino-6-phenyl-s-triazine and 2

2′-diamino-4

4′-bithiazole (DABT) with glyoxal．The polycondensation was processed under acidic condition with the effect of acetic acid．The preparation of two complexes of Fe2+ are described. Their structures were determined by FTIR and 1H-NMR

The values of [η] were obtained at 300℃ by using an Ubbelodhe viscomter with capillary diameter of 0.55 mm. The decomposition temperatures of DAPTPA

DAPIPA and DAPA obtained by thermogravimetic analysis were all above 300℃

indicating good thermal stability．The temperature dependence of magnetization at an applied field 2.39×106 A／m and the applied field dependence of magnetization at 5 K for the Fe2+ complexes were measured by PPMS (physical property measurement system)．The saturation values of magnetization of PBTPZ-Fe2+ and PBTGZ-Fe2+ were 5.4 Am2／kg and 2.6 Am2／kg

and the coercive force of the complexes were 7564 A／m and 75876 A／m

respectively. The “S” shape of magnetic hysteresis loop for PBTPZ-Fe2+ and PBTGZ-Fe2+-and their values of residual magnetization 0.165 Am2／kg and 0.011 Am2／kg indicated they were soft magnets. The existence of benzenes ring enlarges the distance of two adjacent Fe2+ ions

which causes the difference of the magnetic properties of the two complexes．