芳杂环聚西佛碱Fe~(2+)配合物的合成及磁性能

以 2 ,2′ 二氨基 4 ,4′ 联噻唑 (DABT) ,2 ,6 二乙酰基吡啶 (DAP)及苯二甲醛为原料合成了三个新型结构的芳杂环聚西佛碱 (PBTAP ,PBTMP ,PBTPP) ,并制备了其相应的Fe2 + 配合物 .利用FTIR确定了聚合物及其配合物的结构 ,借助多功能材料物理特性测量系统 (PPMS :PhysicalPropertyMeasurementSystem)测定配合物的磁性能 ,测试结果表明这三个聚合物的Fe2 + 配合物都是有机软磁体 ,具有相对较高的磁饱和强度 (Ms) ,其中PBTAP Fe2 + 的磁饱和强度为 6 2emu g ,顺磁居里温度 (Tp)达 88K ,且具有S型的磁滞回线 ,此结果表明此配合物在低温下是有机软铁磁体 .

SYNTHESIS AND MAGNETIC PROPERTIES OF HETEROAROMATIC POLY(SCHIFF BASE)-Fe2+ COMPLEXES

Organic or polymeric ferromagnet is a new kind of magnetic material. Compared with inorganic ferromagnet, the organic ferromagnet exhibits the characteristics of structural diversities, low density, and readily processing. The magnetic properties of organic magnets can be tuned by changing their molecule structure. So the synthesis of novel organic magnets is significant in the field of magnetic materials. In this article we report three poly(Schiff base)s (PBTAP,PBTMP,PBTPP) synthesized by condensation from 2,2′-diamino-4,4′-bithiazole (DABT) with 2,6-diacetypyridine(DAP), m-phthaldialdehyde and p-phthaldialdehyde, respectively and a new series of complexes prepared from Fe 2+ with the three polymers.The polymers and their Fe 2+ complexes were characterized with FTIR instruments.The magnetic properties of complexes were measured by using PPMS-9 (Physical Property Measurement System).It was found that these Fe 2+ complexes were soft magnets and had relatively high saturation magnetizations.The saturation magnetization of PBTAP-Fe 2+ is 6 2 emu/g,its paramagnetic Curie temperature is 88 K, and there is a magnetic hysteresis loop at 2 K.The results show that PBTAP-Fe 2+ is a soft ferromagnet at low temperatures.The magnetic properties of PBTMP-Fe 2+ is similar with those of PBTPP-Fe 2+.The saturation magnetization of PBTMP-Fe 2+ is 4 8 emu/g, and that of PBTPP-Fe 2+ is 3 4 emu/g.Both of them have a negative Curie-Weiss temperature and an “S" shape magnetic hysteresis loop.These results mean that PBTPP-Fe 2+ as well as PBTMP-Fe 2+ exhibits ferromagnetism at low temperatures and antiferromagnetism at relatively high temperatures.